Semi-detached house in De Pinte, Belgium - LEHRlehr.be/Downloads/IEA_DEPINTE.pdf · 2017-02-27 ·...
8
IEA – SHC Task 37 Advanced Housing Renovation with Solar & Conservation Semi-detached house in De Pinte, Belgium OWNER Huyghe-Van Steeland ARCHITECT Alexis Versele Architecten vennootschap PROJECT SUMMARY Retrofit of a semi-detached house from the 50’s towards passive house standard. SPECIAL FEATURES Passive house standard Ecological design
Transcript of Semi-detached house in De Pinte, Belgium - LEHRlehr.be/Downloads/IEA_DEPINTE.pdf · 2017-02-27 ·...
IEA
ndashSH
C T
ask
37
Adva
nce
d H
ousi
ng R
enova
tion w
ith S
ola
r amp
Conse
rvat
ion
Sem
i-det
ached
house
in D
e Pin
te B
elgiu
m
OW
NE
R
Huyg
he-
Van
Ste
elan
d
AR
CH
ITE
CT
Ale
xis
Ver
sele
Arc
hitec
ten
vennoots
chap
PR
OJE
CT S
UM
MA
RY
Ret
rofit of a
sem
i-det
ached
house
from
the
50rsquos
tow
ards
pas
sive
house
stan
dar
d
SP
EC
IAL F
EA
TU
RE
S
Pas
sive
house
sta
ndar
d
Eco
logic
al d
esig
n
BA
CK
GR
OU
ND
The
owne
rs o
f this h
alf-op
en h
ouse
from the
50ies
wan
ted
a he
althy an
d low-ene
rgy ho
use
with
lots of
light and
ope
n sp
ace B
ut the
sea
rch for an
architect
who
cou
ld rea
lize their drea
m hou
se turne
d ou
t to be
difficu
lt W
hen their first architect prese
nted
the
m the
prelim
inary sketch
es o
f the
future h
ouse
the
design
was
sev
erely ov
er b
udge
t while n
ot fully tak
ing
into
acco
unt a
low-ene
rgy co
ncep
t
So
the
owne
rs d
ecided
to
search
an
arch
itect w
ho
alread
y ha
d ex
perie
nce with
ene
rgy efficient buildings
and
foun
d this p
erso
n in Alexis
Verse
leArchitects
Afte
r an
initia
l interview and
a visit to the
hou
se the
decision
was
mad
e to ren
ovate the
prop
erty tow
ards
passive stan
dard an
d clos
e to the
pos
tulated bu
dget
The
new
des
ign
focu
sed
on sufficient ins
ulation
and
airtight co
nstruc
tion Since
the
orientation
of the
building
was
far from ide
al the
common
wall be
ing
oriented
so
uth windo
w su
rfac
es were
design
ed to
max
imize the po
ssible pas
sive
solar gains
New
const
ruct
ion o
r re
nova
tion
One
co
uld
argu
e that ne
w co
nstruc
tion
towards
passive ho
use stan
dards wou
ld hav
e be
en preferred
Still
the
decision
was
mad
e to retrofit the
building
beca
use of
bullthe
exce
llent s
truc
ture o
f the
existin
g dw
elling
cons
istin
g of 19c
m th
ick co
ncrete blocks which
were
still in ex
cellent co
ndition
The
ir thermal
inertia
was
ano
ther plus
bullwas
te red
uctio
n by reus
ing the ex
istin
g materials
This was
clearly a sus
tainab
le dec
ision
bullthe redu
ced VAT rate for retrofit of 6 c
ompa
red
to th
e 21
rate for ne
w con
struction
The
orig
inal fron
t view of the
dwelling
The
orig
inal bac
k view
of the
dwelling
The
ori
gin
al h
ouse
The
existing dw
elling co
nsisted of a m
ain vo
lume with
a pitche
d roof to w
hich
differen
t co
nstruc
tions
had
been
ad
ded
acco
rding
to the
nee
ds o
f the
form
er
inha
bitants As the co
mmon
wall w
as alm
ost pe
rfec
tly
oriented
tow
ards
the
south this prov
ided
an
ex
tra
challeng
e to rea
ch pas
sive
hou
se stand
ard
The
owne
rs w
anted a ho
use with
a lsquolofty fee
lingrsquo with
lots of light an
d an
op
en plan
This
insp
ired
the
orga
niza
tion of the
differen
t func
tions
the
bedroo
ms
were plac
ed on the
groun
d flo
or whe
re natural light
was
less abu
ndan
t
The
living sp
ace an
d kitche
n wou
ld tak
e up
the
firs
t
floor By raising the ea
ves an
d ch
anging
the
pitch of
the ne
w roo
f on
e big op
en spa
ce w
as created
here
includ
ing a ne
w m
ezza
nine
grou
nd floo
rfirst floo
rmez
zanine
cros
s se
ction with
old volum
e marke
d
The
orig
inal plans
of the
dwellin
g
SU
MM
AR
Y O
F T
HE R
EN
OVA
TIO
N
bullRep
lacing
the
existing
anne
xes by
a n
ew o
ne res
ultin
g in a
n
improv
ed com
pactne
ss (from
173m
to 216m
)
bullRep
lace
men
t of the
worn ou
t roo
f con
struction
bullRed
esign of th
e layo
ut and
the circulation of th
e ho
use
bullRem
oval of the ex
terio
r brick faccedila
de rep
lace
d by
a timbe
r fram
e
cons
truc
tion an
d filled with
cellulose
bullAir tig
htne
ss of 0
56 h-
1
bullMec
hanica
l ven
tilation with
cou
nter-flow hea
t excha
nger
bullGroun
dwater hea
t excha
nger
bullFlat p
late solar collector
Before
Afte
r
CO
NSTR
UC
TIO
N
Roof co
nst
ruct
ion (new
) U
-val
ue 0
12
W(
msup2middot
K)
(top
dow
n)
-Roo
f tiles
50 m
m
-Woo
d-fib
erbo
ard
22 m
m
-Rafter + cellulose
82 m
m
-Woo
den I-be
ams + cellulose
30
0 mm
-OSB
15 m
m
-La
thwork
22 m
m
-Gyp
sum Fibrebo
ard
125 m
m
Total
5035 mm
Wal
l const
ruct
ion
U-v
alue
01
26 W
(m
sup2middotK
)
(interio
r to exterior)
-Interio
r plas
ter
15 m
m
-Con
crete bloc
ks19
0 mm
-Woo
den I-be
ams + cellulose
(ne
w) 240
mm
-Woo
d-fib
re boa
rd (ha
rdbo
ard) (ne
w)
18 m
m
-Woo
d-fib
re boa
rd (so
ft bo
ard) (ne
w)
60 m
m
-Exterior stuc
co (ne
w)
20 m
m
Total
543 mm
Flo
or co
nst
ruct
ion
U-v
alue
00
86 W
(m
sup2middotK
)
(top
dow
n)
-Lino
leum
(ne
w)
6 mm
-Scree
d (new
)70
mm
-Phe
nolic
rigid boa
rd in
sulatio
n (new
)26
0 mm
-Con
crete slab
150 mm
Total
486 mm
Tim
ber fram
e co
nstruc
tion fix
ed to
the ex
istin
g wall The
originally w
all w
as erected
with
con
crete bloc
ks b
ut during
the retrofit an
d the ad
aptatio
n of th
e windo
ws so
me clay
tile
bloc
ks w
ere bu
ild in
RE
PLA
CIN
G T
HE O
UTS
IDE B
RIC
K F
AC
AD
E
The
old h
ouse
was
built with
a traditio
nal ca
vity
wall
cons
truc
tion
with
out
insu
latio
n
Afte
r
cons
ultatio
n with
the
con
trac
tor the
outside
wall
was
rem
oved
to b
e replac
ed b
y a
timbe
r fram
e
cons
truc
tion fixed
to th
e inne
r walls c
ontaining the
insu
latio
n laye
r
During co
nstruc
tion it bec
ame clea
r that the
inne
r
wall was
far
from
straight In so
me
plac
es a
diffe
renc
e of 7 cm had
to be ga
pped
The
hou
se afte
r dism
antling
the walls
The
con
struction of th
e co
mmon
wall
REA
CH
ING
PA
SSIV
E H
OU
SE S
TA
ND
AR
D
The
first
PHPP
calculation
of
the
projec
t
unde
rline
d ho
w big
the
challeng
e wou
ld be
to
reac
h pa
ssive stan
dard Following ch
ange
s were
mad
e to the
orig
inal des
ign in orde
r to rea
ch the
target stand
ard
bullThe
insu
latio
n laye
r in the
walls was
increa
sed
bullThe
size
of the
windo
ws
was
op
timized
allowing
for
bigg
er windo
ws
at the
back
(wes
t-side
)
bullThe
skylights
and
light tun
nel on
the
eas
t
originally plan
ned were
deleted
beca
use
they
wou
ldnrsquot d
eliver eno
ugh so
lar ga
ins
bullThe
flo
or insu
latio
n type
was
ch
ange
d
towards
a
less
ecolog
ical
but
high
er
performan
ce material (26c
m Phe
nolic
rigid
board in stead
of c
ellulose
)
EN
SU
RIN
G A
IR T
IGH
TN
ES
S
Bec
ause
of the
mixed
struc
ture o
f so
lid a
nd tim
ber
cons
truc
tion the
conn
ectio
ns be
twee
n them
were
critica
l po
ints Spe
cial b
ands
tha
t ca
n be
plastered
were us
ed to
mak
e this con
nection
A firs
t air tig
htne
ss tes
t sh
owed
an infiltration rate of
056
h-1 at 50
Pa pres
sure differen
ce (n 5
0) The
big
leak
s that rem
aine
d were situated
at the pa
ssag
e of
the
solar
collector pipe
s throug
h the
roof (eve
n
thou
ght they
were
tape
d off as
goo
d as
pos
sible)
the pa
ssag
e of an old elec
tricity cab
le in
the
old floor
and the interrup
tion of the
stucco at the
bas
e of the
wall in the co
rner betwee
n co
mmon
wall a
nd fa
ccedilade
Tap
ing off the
OSB boa
rds
and co
nnec
tion be
twee
n
OSB and
plaster on the
brick walls (the white ban
d
in th
e up
per ph
oto)
TH
ER
MA
L B
RID
GE
S A
ND
SO
LU
TIO
NS
Res
olving
the
the
rmal brid
ges be
came an
add
ition
al
challeng
e m
ainly be
caus
e the startin
g po
int was
an
alread
y ex
istin
g structure The
mos
t im
portan
t
conn
ectio
ns were simulated
A classic the
rmal brid
ge w
hen retrofitting is the
bas
e
of the
wall
Calcu
latio
ns s
howed
itsrsquogrea
t im
pact
Bec
ause
a
moisture
resisting
barrier
had
to be
installed an
yway
it was
dec
ided
to replac
e the first
laye
r of bric
ks by ce
llular co
ncrete
The
joint be
twee
n faccedila
de an
d co
mmon
wall was
anothe
r prob
lematic co
nnec
tion Here no
real
solutio
n was
foun
d bu
t ad
ding
an
ad
ditio
nal
insu
latio
n laye
r on
the
inne
r wall at leas
t grea
tly
redu
ced the thermal brid
ging
effe
ct
Finally the
installatio
n of the
roof windo
ws
was
stud
ied B
ecau
se o
f their po
sitio
ning
outside
of the
roof co
nstruc
tion the
thermal bridging
effect was
even
greater To redu
ce this a sec
ond windo
w w
as
plac
ed und
erne
ath the roof windo
w
The
rmal break
at the
bas
e of th
e walls
Con
nection tres
hold
with
fron
tdoo
r
Detail a
nd th
ermal brid
ge sim
ulation of th
e co
nnec
tion be
twee
n faccedila
de and
common
wall
Detail a
nd th
ermal brid
ge sim
ulation of th
e co
nnec
tion be
twee
n roof windo
w
and inne
r windo
w
The
roo
f windo
ws an
d the so
lar thermal collector
Ψlt 001 Wm
K
Ψlt 001 Wm
K
SU
STA
INA
BLE M
ATER
IALS
For cho
osing the bu
ilding materials their ec
olog
ical
value
was
tak
en into
acco
unt
FSC lab
eled
tim
ber
was
us
ed
for
the
timbe
r fram
e co
nstruc
tion
Cellulose
insu
latio
n was
use
d for the walls and
roo
f
Only in the
floor a che
mical ins
ulation material was
used
(Fen
ol-in
sulatio
n)
An
interio
r plas
ter ba
sed
on na
tural gy
psum
was
used
for the
mas
onry w
alls Cork an
d linoleu
m w
ere
applied as
floo
r de
cking A m
ineral stucco ap
plied on
a woo
d fib
er in
sulatio
n plate was
use
d as
an ex
terio
r
finishing
A fin
al as
pect of su
staina
bility
is the
reus
e of
rainwater In front of the ho
use a rain w
ater tan
k of
5000
l is plac
ed 2 toilets and
a w
ashing
mac
hine
are
conn
ected
to it
This
way
the
use
of tap
water is
redu
ced to a m
inim
um
Mec
hanica
l ven
tilation un
it
CO
ST A
NA
LIS
YS
The
ren
ovation
to p
assive
hou
se stand
ard
was
not
eviden
t This tran
slates
into the co
st of the projec
t
This also
reflects the un
favo
rable
orientation
of the
dwelling the
refore add
ition
al in
sulatio
n was
nee
ded
On
the
othe
r ha
nd the
redu
ced
VAT rate various
gran
ts and
a fed
eral tax
ded
uctio
n for retrofitting to
passive
hous
e stan
dard mak
e it
all ec
onom
ically
viab
le in
times
of h
igh en
ergy
pric
es
CO
NC
LU
SIO
NS
Whe
n the ow
ners firs
t form
ulated
the
ir drea
m of an
ecolog
ical ne
w ho
me their wishe
s were
far from
met Afte
r ha
ving
fou
nd a
n ex
perie
nced
architect
eage
r to rea
lize
their drea
m the
end
resu
lt was
a
sustaina
ble
and
ecolog
ical pa
ssive
hous
e retrofit
The
project fully u
ses
the
existin
g po
tential of the
building and
cha
nges
the rest fo
r the be
tter
The
proce
ss w
as n
ot a
n ea
sy o
ne tho
ugh S
olving
thermal brid
ges in
corporating air tig
htne
ss solutions
deve
loping
an
efficient ven
tilation
strategy
and
las
t
but no
t leas
t ke
eping the bu
dget w
ithin rea
sona
ble
margins
req
uired co
mmitm
ent a
nd study
work
An elec
trical res
istanc
e for po
st hea
ting the living area
sCos
t diagram
2 7
54
043
9
13
2
1
1
2
20
0
blowerdoor
demolition roof
scaffold
contractor carcass
facade structure
carcass
contractor wooden structure and finishing
EPDM
Cellular glas
Cork (incl bathroom)
Inner plaster
Exterior stucco
Water
electricity
Sum
mar
y of U
-val
ues
W(m
sup2K
)R
EN
EW
AB
LE E
NER
GY U
SE
Solar hea
ting co
llector flat p
late collector 8
msup2
storag
e vo
lume 30
0l
EN
ER
GY P
ER
FO
RM
AN
CE
Spa
ce + w
ater hea
ting (prim
ary en
ergy
)
Before
450 kW
hmsup2a
Afte
r67
kWhmsup2a
Red
uctio
n
85
Flemish im
plem
entatio
nof EPBD
INFO
RM
ATIO
N S
OU
RC
ES
Alexis Verse
le Architecten
PHP vzw
Bro
chure
auth
ors
Wou
terHilderso
npa
ssiefhuisp
latfo
rmbe
Joha
nCre
passiefhuisp
latfo
rmbe
This rese
arch
was
exe
cuted with
in the
framew
ork of
the
LEHR projec
t (w
wwle
hrbe)
grou
ping
three
rese
arch
tea
ms (PHPPMP Architecture et C
limat ndash
UCL BBRI)
on ac
coun
t of the
Belgian
Fed
eral
Scien
ce
Policy
exec
uting
the
ldquoProgram
me
to
stim
ulate
know
ledg
e tran
sfer in area
s of strategic
impo
rtan
cerdquo
Before
Afte
r
Roo
f55
012
Walls
19
012
6
Bas
emen
t ceiling
27
008
6
Windo
ws
5074
BU
ILD
ING
SER
VIC
ES
Mec
hanica
l ve
ntilatio
n sy
stem
with
a
coun
ter flo
w
heat excha
nger (η=
84)
An
elec
trical d
ecen
tral
post-hea
ter (120
0W) warms
the ve
ntilatio
n air go
ing to the
living room
Add
ition
al
elec
tric he
aters
can
heat the
air
going
to the
bedroo
ms
as de
sired In the
bathroom
an
ex
tra
elec
trical h
eater is ins
talled
beca
use
of the
highe
r
comfort te
mpe
ratures that are req
uired there
To prev
ent ov
erhe
ating du
ring the su
mmer screen
s
are installed on
all roof w
indo
ws a
s well as
on the
back w
indo
ws on
the
firs
t flo
or 2 tree
s in front of the
windo
ws will provide
sufficient sha
dow on the grou
nd
floor
Com
pact unit with
hea
t pu
mp an
d co
nnec
ted to the
solar thermal collector via a 30
0l buffer tank
This is
used
for the do
mes
tic w
arm w
ater
Front a
nd rea
rview
of the
hous
e
tree
s forna
turalsha
ding
BA
CK
GR
OU
ND
The
owne
rs o
f this h
alf-op
en h
ouse
from the
50ies
wan
ted
a he
althy an
d low-ene
rgy ho
use
with
lots of
light and
ope
n sp
ace B
ut the
sea
rch for an
architect
who
cou
ld rea
lize their drea
m hou
se turne
d ou
t to be
difficu
lt W
hen their first architect prese
nted
the
m the
prelim
inary sketch
es o
f the
future h
ouse
the
design
was
sev
erely ov
er b
udge
t while n
ot fully tak
ing
into
acco
unt a
low-ene
rgy co
ncep
t
So
the
owne
rs d
ecided
to
search
an
arch
itect w
ho
alread
y ha
d ex
perie
nce with
ene
rgy efficient buildings
and
foun
d this p
erso
n in Alexis
Verse
leArchitects
Afte
r an
initia
l interview and
a visit to the
hou
se the
decision
was
mad
e to ren
ovate the
prop
erty tow
ards
passive stan
dard an
d clos
e to the
pos
tulated bu
dget
The
new
des
ign
focu
sed
on sufficient ins
ulation
and
airtight co
nstruc
tion Since
the
orientation
of the
building
was
far from ide
al the
common
wall be
ing
oriented
so
uth windo
w su
rfac
es were
design
ed to
max
imize the po
ssible pas
sive
solar gains
New
const
ruct
ion o
r re
nova
tion
One
co
uld
argu
e that ne
w co
nstruc
tion
towards
passive ho
use stan
dards wou
ld hav
e be
en preferred
Still
the
decision
was
mad
e to retrofit the
building
beca
use of
bullthe
exce
llent s
truc
ture o
f the
existin
g dw
elling
cons
istin
g of 19c
m th
ick co
ncrete blocks which
were
still in ex
cellent co
ndition
The
ir thermal
inertia
was
ano
ther plus
bullwas
te red
uctio
n by reus
ing the ex
istin
g materials
This was
clearly a sus
tainab
le dec
ision
bullthe redu
ced VAT rate for retrofit of 6 c
ompa
red
to th
e 21
rate for ne
w con
struction
The
orig
inal fron
t view of the
dwelling
The
orig
inal bac
k view
of the
dwelling
The
ori
gin
al h
ouse
The
existing dw
elling co
nsisted of a m
ain vo
lume with
a pitche
d roof to w
hich
differen
t co
nstruc
tions
had
been
ad
ded
acco
rding
to the
nee
ds o
f the
form
er
inha
bitants As the co
mmon
wall w
as alm
ost pe
rfec
tly
oriented
tow
ards
the
south this prov
ided
an
ex
tra
challeng
e to rea
ch pas
sive
hou
se stand
ard
The
owne
rs w
anted a ho
use with
a lsquolofty fee
lingrsquo with
lots of light an
d an
op
en plan
This
insp
ired
the
orga
niza
tion of the
differen
t func
tions
the
bedroo
ms
were plac
ed on the
groun
d flo
or whe
re natural light
was
less abu
ndan
t
The
living sp
ace an
d kitche
n wou
ld tak
e up
the
firs
t
floor By raising the ea
ves an
d ch
anging
the
pitch of
the ne
w roo
f on
e big op
en spa
ce w
as created
here
includ
ing a ne
w m
ezza
nine
grou
nd floo
rfirst floo
rmez
zanine
cros
s se
ction with
old volum
e marke
d
The
orig
inal plans
of the
dwellin
g
SU
MM
AR
Y O
F T
HE R
EN
OVA
TIO
N
bullRep
lacing
the
existing
anne
xes by
a n
ew o
ne res
ultin
g in a
n
improv
ed com
pactne
ss (from
173m
to 216m
)
bullRep
lace
men
t of the
worn ou
t roo
f con
struction
bullRed
esign of th
e layo
ut and
the circulation of th
e ho
use
bullRem
oval of the ex
terio
r brick faccedila
de rep
lace
d by
a timbe
r fram
e
cons
truc
tion an
d filled with
cellulose
bullAir tig
htne
ss of 0
56 h-
1
bullMec
hanica
l ven
tilation with
cou
nter-flow hea
t excha
nger
bullGroun
dwater hea
t excha
nger
bullFlat p
late solar collector
Before
Afte
r
CO
NSTR
UC
TIO
N
Roof co
nst
ruct
ion (new
) U
-val
ue 0
12
W(
msup2middot
K)
(top
dow
n)
-Roo
f tiles
50 m
m
-Woo
d-fib
erbo
ard
22 m
m
-Rafter + cellulose
82 m
m
-Woo
den I-be
ams + cellulose
30
0 mm
-OSB
15 m
m
-La
thwork
22 m
m
-Gyp
sum Fibrebo
ard
125 m
m
Total
5035 mm
Wal
l const
ruct
ion
U-v
alue
01
26 W
(m
sup2middotK
)
(interio
r to exterior)
-Interio
r plas
ter
15 m
m
-Con
crete bloc
ks19
0 mm
-Woo
den I-be
ams + cellulose
(ne
w) 240
mm
-Woo
d-fib
re boa
rd (ha
rdbo
ard) (ne
w)
18 m
m
-Woo
d-fib
re boa
rd (so
ft bo
ard) (ne
w)
60 m
m
-Exterior stuc
co (ne
w)
20 m
m
Total
543 mm
Flo
or co
nst
ruct
ion
U-v
alue
00
86 W
(m
sup2middotK
)
(top
dow
n)
-Lino
leum
(ne
w)
6 mm
-Scree
d (new
)70
mm
-Phe
nolic
rigid boa
rd in
sulatio
n (new
)26
0 mm
-Con
crete slab
150 mm
Total
486 mm
Tim
ber fram
e co
nstruc
tion fix
ed to
the ex
istin
g wall The
originally w
all w
as erected
with
con
crete bloc
ks b
ut during
the retrofit an
d the ad
aptatio
n of th
e windo
ws so
me clay
tile
bloc
ks w
ere bu
ild in
RE
PLA
CIN
G T
HE O
UTS
IDE B
RIC
K F
AC
AD
E
The
old h
ouse
was
built with
a traditio
nal ca
vity
wall
cons
truc
tion
with
out
insu
latio
n
Afte
r
cons
ultatio
n with
the
con
trac
tor the
outside
wall
was
rem
oved
to b
e replac
ed b
y a
timbe
r fram
e
cons
truc
tion fixed
to th
e inne
r walls c
ontaining the
insu
latio
n laye
r
During co
nstruc
tion it bec
ame clea
r that the
inne
r
wall was
far
from
straight In so
me
plac
es a
diffe
renc
e of 7 cm had
to be ga
pped
The
hou
se afte
r dism
antling
the walls
The
con
struction of th
e co
mmon
wall
REA
CH
ING
PA
SSIV
E H
OU
SE S
TA
ND
AR
D
The
first
PHPP
calculation
of
the
projec
t
unde
rline
d ho
w big
the
challeng
e wou
ld be
to
reac
h pa
ssive stan
dard Following ch
ange
s were
mad
e to the
orig
inal des
ign in orde
r to rea
ch the
target stand
ard
bullThe
insu
latio
n laye
r in the
walls was
increa
sed
bullThe
size
of the
windo
ws
was
op
timized
allowing
for
bigg
er windo
ws
at the
back
(wes
t-side
)
bullThe
skylights
and
light tun
nel on
the
eas
t
originally plan
ned were
deleted
beca
use
they
wou
ldnrsquot d
eliver eno
ugh so
lar ga
ins
bullThe
flo
or insu
latio
n type
was
ch
ange
d
towards
a
less
ecolog
ical
but
high
er
performan
ce material (26c
m Phe
nolic
rigid
board in stead
of c
ellulose
)
EN
SU
RIN
G A
IR T
IGH
TN
ES
S
Bec
ause
of the
mixed
struc
ture o
f so
lid a
nd tim
ber
cons
truc
tion the
conn
ectio
ns be
twee
n them
were
critica
l po
ints Spe
cial b
ands
tha
t ca
n be
plastered
were us
ed to
mak
e this con
nection
A firs
t air tig
htne
ss tes
t sh
owed
an infiltration rate of
056
h-1 at 50
Pa pres
sure differen
ce (n 5
0) The
big
leak
s that rem
aine
d were situated
at the pa
ssag
e of
the
solar
collector pipe
s throug
h the
roof (eve
n
thou
ght they
were
tape
d off as
goo
d as
pos
sible)
the pa
ssag
e of an old elec
tricity cab
le in
the
old floor
and the interrup
tion of the
stucco at the
bas
e of the
wall in the co
rner betwee
n co
mmon
wall a
nd fa
ccedilade
Tap
ing off the
OSB boa
rds
and co
nnec
tion be
twee
n
OSB and
plaster on the
brick walls (the white ban
d
in th
e up
per ph
oto)
TH
ER
MA
L B
RID
GE
S A
ND
SO
LU
TIO
NS
Res
olving
the
the
rmal brid
ges be
came an
add
ition
al
challeng
e m
ainly be
caus
e the startin
g po
int was
an
alread
y ex
istin
g structure The
mos
t im
portan
t
conn
ectio
ns were simulated
A classic the
rmal brid
ge w
hen retrofitting is the
bas
e
of the
wall
Calcu
latio
ns s
howed
itsrsquogrea
t im
pact
Bec
ause
a
moisture
resisting
barrier
had
to be
installed an
yway
it was
dec
ided
to replac
e the first
laye
r of bric
ks by ce
llular co
ncrete
The
joint be
twee
n faccedila
de an
d co
mmon
wall was
anothe
r prob
lematic co
nnec
tion Here no
real
solutio
n was
foun
d bu
t ad
ding
an
ad
ditio
nal
insu
latio
n laye
r on
the
inne
r wall at leas
t grea
tly
redu
ced the thermal brid
ging
effe
ct
Finally the
installatio
n of the
roof windo
ws
was
stud
ied B
ecau
se o
f their po
sitio
ning
outside
of the
roof co
nstruc
tion the
thermal bridging
effect was
even
greater To redu
ce this a sec
ond windo
w w
as
plac
ed und
erne
ath the roof windo
w
The
rmal break
at the
bas
e of th
e walls
Con
nection tres
hold
with
fron
tdoo
r
Detail a
nd th
ermal brid
ge sim
ulation of th
e co
nnec
tion be
twee
n faccedila
de and
common
wall
Detail a
nd th
ermal brid
ge sim
ulation of th
e co
nnec
tion be
twee
n roof windo
w
and inne
r windo
w
The
roo
f windo
ws an
d the so
lar thermal collector
Ψlt 001 Wm
K
Ψlt 001 Wm
K
SU
STA
INA
BLE M
ATER
IALS
For cho
osing the bu
ilding materials their ec
olog
ical
value
was
tak
en into
acco
unt
FSC lab
eled
tim
ber
was
us
ed
for
the
timbe
r fram
e co
nstruc
tion
Cellulose
insu
latio
n was
use
d for the walls and
roo
f
Only in the
floor a che
mical ins
ulation material was
used
(Fen
ol-in
sulatio
n)
An
interio
r plas
ter ba
sed
on na
tural gy
psum
was
used
for the
mas
onry w
alls Cork an
d linoleu
m w
ere
applied as
floo
r de
cking A m
ineral stucco ap
plied on
a woo
d fib
er in
sulatio
n plate was
use
d as
an ex
terio
r
finishing
A fin
al as
pect of su
staina
bility
is the
reus
e of
rainwater In front of the ho
use a rain w
ater tan
k of
5000
l is plac
ed 2 toilets and
a w
ashing
mac
hine
are
conn
ected
to it
This
way
the
use
of tap
water is
redu
ced to a m
inim
um
Mec
hanica
l ven
tilation un
it
CO
ST A
NA
LIS
YS
The
ren
ovation
to p
assive
hou
se stand
ard
was
not
eviden
t This tran
slates
into the co
st of the projec
t
This also
reflects the un
favo
rable
orientation
of the
dwelling the
refore add
ition
al in
sulatio
n was
nee
ded
On
the
othe
r ha
nd the
redu
ced
VAT rate various
gran
ts and
a fed
eral tax
ded
uctio
n for retrofitting to
passive
hous
e stan
dard mak
e it
all ec
onom
ically
viab
le in
times
of h
igh en
ergy
pric
es
CO
NC
LU
SIO
NS
Whe
n the ow
ners firs
t form
ulated
the
ir drea
m of an
ecolog
ical ne
w ho
me their wishe
s were
far from
met Afte
r ha
ving
fou
nd a
n ex
perie
nced
architect
eage
r to rea
lize
their drea
m the
end
resu
lt was
a
sustaina
ble
and
ecolog
ical pa
ssive
hous
e retrofit
The
project fully u
ses
the
existin
g po
tential of the
building and
cha
nges
the rest fo
r the be
tter
The
proce
ss w
as n
ot a
n ea
sy o
ne tho
ugh S
olving
thermal brid
ges in
corporating air tig
htne
ss solutions
deve
loping
an
efficient ven
tilation
strategy
and
las
t
but no
t leas
t ke
eping the bu
dget w
ithin rea
sona
ble
margins
req
uired co
mmitm
ent a
nd study
work
An elec
trical res
istanc
e for po
st hea
ting the living area
sCos
t diagram
2 7
54
043
9
13
2
1
1
2
20
0
blowerdoor
demolition roof
scaffold
contractor carcass
facade structure
carcass
contractor wooden structure and finishing
EPDM
Cellular glas
Cork (incl bathroom)
Inner plaster
Exterior stucco
Water
electricity
Sum
mar
y of U
-val
ues
W(m
sup2K
)R
EN
EW
AB
LE E
NER
GY U
SE
Solar hea
ting co
llector flat p
late collector 8
msup2
storag
e vo
lume 30
0l
EN
ER
GY P
ER
FO
RM
AN
CE
Spa
ce + w
ater hea
ting (prim
ary en
ergy
)
Before
450 kW
hmsup2a
Afte
r67
kWhmsup2a
Red
uctio
n
85
Flemish im
plem
entatio
nof EPBD
INFO
RM
ATIO
N S
OU
RC
ES
Alexis Verse
le Architecten
PHP vzw
Bro
chure
auth
ors
Wou
terHilderso
npa
ssiefhuisp
latfo
rmbe
Joha
nCre
passiefhuisp
latfo
rmbe
This rese
arch
was
exe
cuted with
in the
framew
ork of
the
LEHR projec
t (w
wwle
hrbe)
grou
ping
three
rese
arch
tea
ms (PHPPMP Architecture et C
limat ndash
UCL BBRI)
on ac
coun
t of the
Belgian
Fed
eral
Scien
ce
Policy
exec
uting
the
ldquoProgram
me
to
stim
ulate
know
ledg
e tran
sfer in area
s of strategic
impo
rtan
cerdquo
Before
Afte
r
Roo
f55
012
Walls
19
012
6
Bas
emen
t ceiling
27
008
6
Windo
ws
5074
BU
ILD
ING
SER
VIC
ES
Mec
hanica
l ve
ntilatio
n sy
stem
with
a
coun
ter flo
w
heat excha
nger (η=
84)
An
elec
trical d
ecen
tral
post-hea
ter (120
0W) warms
the ve
ntilatio
n air go
ing to the
living room
Add
ition
al
elec
tric he
aters
can
heat the
air
going
to the
bedroo
ms
as de
sired In the
bathroom
an
ex
tra
elec
trical h
eater is ins
talled
beca
use
of the
highe
r
comfort te
mpe
ratures that are req
uired there
To prev
ent ov
erhe
ating du
ring the su
mmer screen
s
are installed on
all roof w
indo
ws a
s well as
on the
back w
indo
ws on
the
firs
t flo
or 2 tree
s in front of the
windo
ws will provide
sufficient sha
dow on the grou
nd
floor
Com
pact unit with
hea
t pu
mp an
d co
nnec
ted to the
solar thermal collector via a 30
0l buffer tank
This is
used
for the do
mes
tic w
arm w
ater
Front a
nd rea
rview
of the
hous
e
tree
s forna
turalsha
ding
grou
nd floo
rfirst floo
rmez
zanine
cros
s se
ction with
old volum
e marke
d
The
orig
inal plans
of the
dwellin
g
SU
MM
AR
Y O
F T
HE R
EN
OVA
TIO
N
bullRep
lacing
the
existing
anne
xes by
a n
ew o
ne res
ultin
g in a
n
improv
ed com
pactne
ss (from
173m
to 216m
)
bullRep
lace
men
t of the
worn ou
t roo
f con
struction
bullRed
esign of th
e layo
ut and
the circulation of th
e ho
use
bullRem
oval of the ex
terio
r brick faccedila
de rep
lace
d by
a timbe
r fram
e
cons
truc
tion an
d filled with
cellulose
bullAir tig
htne
ss of 0
56 h-
1
bullMec
hanica
l ven
tilation with
cou
nter-flow hea
t excha
nger
bullGroun
dwater hea
t excha
nger
bullFlat p
late solar collector
Before
Afte
r
CO
NSTR
UC
TIO
N
Roof co
nst
ruct
ion (new
) U
-val
ue 0
12
W(
msup2middot
K)
(top
dow
n)
-Roo
f tiles
50 m
m
-Woo
d-fib
erbo
ard
22 m
m
-Rafter + cellulose
82 m
m
-Woo
den I-be
ams + cellulose
30
0 mm
-OSB
15 m
m
-La
thwork
22 m
m
-Gyp
sum Fibrebo
ard
125 m
m
Total
5035 mm
Wal
l const
ruct
ion
U-v
alue
01
26 W
(m
sup2middotK
)
(interio
r to exterior)
-Interio
r plas
ter
15 m
m
-Con
crete bloc
ks19
0 mm
-Woo
den I-be
ams + cellulose
(ne
w) 240
mm
-Woo
d-fib
re boa
rd (ha
rdbo
ard) (ne
w)
18 m
m
-Woo
d-fib
re boa
rd (so
ft bo
ard) (ne
w)
60 m
m
-Exterior stuc
co (ne
w)
20 m
m
Total
543 mm
Flo
or co
nst
ruct
ion
U-v
alue
00
86 W
(m
sup2middotK
)
(top
dow
n)
-Lino
leum
(ne
w)
6 mm
-Scree
d (new
)70
mm
-Phe
nolic
rigid boa
rd in
sulatio
n (new
)26
0 mm
-Con
crete slab
150 mm
Total
486 mm
Tim
ber fram
e co
nstruc
tion fix
ed to
the ex
istin
g wall The
originally w
all w
as erected
with
con
crete bloc
ks b
ut during
the retrofit an
d the ad
aptatio
n of th
e windo
ws so
me clay
tile
bloc
ks w
ere bu
ild in
RE
PLA
CIN
G T
HE O
UTS
IDE B
RIC
K F
AC
AD
E
The
old h
ouse
was
built with
a traditio
nal ca
vity
wall
cons
truc
tion
with
out
insu
latio
n
Afte
r
cons
ultatio
n with
the
con
trac
tor the
outside
wall
was
rem
oved
to b
e replac
ed b
y a
timbe
r fram
e
cons
truc
tion fixed
to th
e inne
r walls c
ontaining the
insu
latio
n laye
r
During co
nstruc
tion it bec
ame clea
r that the
inne
r
wall was
far
from
straight In so
me
plac
es a
diffe
renc
e of 7 cm had
to be ga
pped
The
hou
se afte
r dism
antling
the walls
The
con
struction of th
e co
mmon
wall
REA
CH
ING
PA
SSIV
E H
OU
SE S
TA
ND
AR
D
The
first
PHPP
calculation
of
the
projec
t
unde
rline
d ho
w big
the
challeng
e wou
ld be
to
reac
h pa
ssive stan
dard Following ch
ange
s were
mad
e to the
orig
inal des
ign in orde
r to rea
ch the
target stand
ard
bullThe
insu
latio
n laye
r in the
walls was
increa
sed
bullThe
size
of the
windo
ws
was
op
timized
allowing
for
bigg
er windo
ws
at the
back
(wes
t-side
)
bullThe
skylights
and
light tun
nel on
the
eas
t
originally plan
ned were
deleted
beca
use
they
wou
ldnrsquot d
eliver eno
ugh so
lar ga
ins
bullThe
flo
or insu
latio
n type
was
ch
ange
d
towards
a
less
ecolog
ical
but
high
er
performan
ce material (26c
m Phe
nolic
rigid
board in stead
of c
ellulose
)
EN
SU
RIN
G A
IR T
IGH
TN
ES
S
Bec
ause
of the
mixed
struc
ture o
f so
lid a
nd tim
ber
cons
truc
tion the
conn
ectio
ns be
twee
n them
were
critica
l po
ints Spe
cial b
ands
tha
t ca
n be
plastered
were us
ed to
mak
e this con
nection
A firs
t air tig
htne
ss tes
t sh
owed
an infiltration rate of
056
h-1 at 50
Pa pres
sure differen
ce (n 5
0) The
big
leak
s that rem
aine
d were situated
at the pa
ssag
e of
the
solar
collector pipe
s throug
h the
roof (eve
n
thou
ght they
were
tape
d off as
goo
d as
pos
sible)
the pa
ssag
e of an old elec
tricity cab
le in
the
old floor
and the interrup
tion of the
stucco at the
bas
e of the
wall in the co
rner betwee
n co
mmon
wall a
nd fa
ccedilade
Tap
ing off the
OSB boa
rds
and co
nnec
tion be
twee
n
OSB and
plaster on the
brick walls (the white ban
d
in th
e up
per ph
oto)
TH
ER
MA
L B
RID
GE
S A
ND
SO
LU
TIO
NS
Res
olving
the
the
rmal brid
ges be
came an
add
ition
al
challeng
e m
ainly be
caus
e the startin
g po
int was
an
alread
y ex
istin
g structure The
mos
t im
portan
t
conn
ectio
ns were simulated
A classic the
rmal brid
ge w
hen retrofitting is the
bas
e
of the
wall
Calcu
latio
ns s
howed
itsrsquogrea
t im
pact
Bec
ause
a
moisture
resisting
barrier
had
to be
installed an
yway
it was
dec
ided
to replac
e the first
laye
r of bric
ks by ce
llular co
ncrete
The
joint be
twee
n faccedila
de an
d co
mmon
wall was
anothe
r prob
lematic co
nnec
tion Here no
real
solutio
n was
foun
d bu
t ad
ding
an
ad
ditio
nal
insu
latio
n laye
r on
the
inne
r wall at leas
t grea
tly
redu
ced the thermal brid
ging
effe
ct
Finally the
installatio
n of the
roof windo
ws
was
stud
ied B
ecau
se o
f their po
sitio
ning
outside
of the
roof co
nstruc
tion the
thermal bridging
effect was
even
greater To redu
ce this a sec
ond windo
w w
as
plac
ed und
erne
ath the roof windo
w
The
rmal break
at the
bas
e of th
e walls
Con
nection tres
hold
with
fron
tdoo
r
Detail a
nd th
ermal brid
ge sim
ulation of th
e co
nnec
tion be
twee
n faccedila
de and
common
wall
Detail a
nd th
ermal brid
ge sim
ulation of th
e co
nnec
tion be
twee
n roof windo
w
and inne
r windo
w
The
roo
f windo
ws an
d the so
lar thermal collector
Ψlt 001 Wm
K
Ψlt 001 Wm
K
SU
STA
INA
BLE M
ATER
IALS
For cho
osing the bu
ilding materials their ec
olog
ical
value
was
tak
en into
acco
unt
FSC lab
eled
tim
ber
was
us
ed
for
the
timbe
r fram
e co
nstruc
tion
Cellulose
insu
latio
n was
use
d for the walls and
roo
f
Only in the
floor a che
mical ins
ulation material was
used
(Fen
ol-in
sulatio
n)
An
interio
r plas
ter ba
sed
on na
tural gy
psum
was
used
for the
mas
onry w
alls Cork an
d linoleu
m w
ere
applied as
floo
r de
cking A m
ineral stucco ap
plied on
a woo
d fib
er in
sulatio
n plate was
use
d as
an ex
terio
r
finishing
A fin
al as
pect of su
staina
bility
is the
reus
e of
rainwater In front of the ho
use a rain w
ater tan
k of
5000
l is plac
ed 2 toilets and
a w
ashing
mac
hine
are
conn
ected
to it
This
way
the
use
of tap
water is
redu
ced to a m
inim
um
Mec
hanica
l ven
tilation un
it
CO
ST A
NA
LIS
YS
The
ren
ovation
to p
assive
hou
se stand
ard
was
not
eviden
t This tran
slates
into the co
st of the projec
t
This also
reflects the un
favo
rable
orientation
of the
dwelling the
refore add
ition
al in
sulatio
n was
nee
ded
On
the
othe
r ha
nd the
redu
ced
VAT rate various
gran
ts and
a fed
eral tax
ded
uctio
n for retrofitting to
passive
hous
e stan
dard mak
e it
all ec
onom
ically
viab
le in
times
of h
igh en
ergy
pric
es
CO
NC
LU
SIO
NS
Whe
n the ow
ners firs
t form
ulated
the
ir drea
m of an
ecolog
ical ne
w ho
me their wishe
s were
far from
met Afte
r ha
ving
fou
nd a
n ex
perie
nced
architect
eage
r to rea
lize
their drea
m the
end
resu
lt was
a
sustaina
ble
and
ecolog
ical pa
ssive
hous
e retrofit
The
project fully u
ses
the
existin
g po
tential of the
building and
cha
nges
the rest fo
r the be
tter
The
proce
ss w
as n
ot a
n ea
sy o
ne tho
ugh S
olving
thermal brid
ges in
corporating air tig
htne
ss solutions
deve
loping
an
efficient ven
tilation
strategy
and
las
t
but no
t leas
t ke
eping the bu
dget w
ithin rea
sona
ble
margins
req
uired co
mmitm
ent a
nd study
work
An elec
trical res
istanc
e for po
st hea
ting the living area
sCos
t diagram
2 7
54
043
9
13
2
1
1
2
20
0
blowerdoor
demolition roof
scaffold
contractor carcass
facade structure
carcass
contractor wooden structure and finishing
EPDM
Cellular glas
Cork (incl bathroom)
Inner plaster
Exterior stucco
Water
electricity
Sum
mar
y of U
-val
ues
W(m
sup2K
)R
EN
EW
AB
LE E
NER
GY U
SE
Solar hea
ting co
llector flat p
late collector 8
msup2
storag
e vo
lume 30
0l
EN
ER
GY P
ER
FO
RM
AN
CE
Spa
ce + w
ater hea
ting (prim
ary en
ergy
)
Before
450 kW
hmsup2a
Afte
r67
kWhmsup2a
Red
uctio
n
85
Flemish im
plem
entatio
nof EPBD
INFO
RM
ATIO
N S
OU
RC
ES
Alexis Verse
le Architecten
PHP vzw
Bro
chure
auth
ors
Wou
terHilderso
npa
ssiefhuisp
latfo
rmbe
Joha
nCre
passiefhuisp
latfo
rmbe
This rese
arch
was
exe
cuted with
in the
framew
ork of
the
LEHR projec
t (w
wwle
hrbe)
grou
ping
three
rese
arch
tea
ms (PHPPMP Architecture et C
limat ndash
UCL BBRI)
on ac
coun
t of the
Belgian
Fed
eral
Scien
ce
Policy
exec
uting
the
ldquoProgram
me
to
stim
ulate
know
ledg
e tran
sfer in area
s of strategic
impo
rtan
cerdquo
Before
Afte
r
Roo
f55
012
Walls
19
012
6
Bas
emen
t ceiling
27
008
6
Windo
ws
5074
BU
ILD
ING
SER
VIC
ES
Mec
hanica
l ve
ntilatio
n sy
stem
with
a
coun
ter flo
w
heat excha
nger (η=
84)
An
elec
trical d
ecen
tral
post-hea
ter (120
0W) warms
the ve
ntilatio
n air go
ing to the
living room
Add
ition
al
elec
tric he
aters
can
heat the
air
going
to the
bedroo
ms
as de
sired In the
bathroom
an
ex
tra
elec
trical h
eater is ins
talled
beca
use
of the
highe
r
comfort te
mpe
ratures that are req
uired there
To prev
ent ov
erhe
ating du
ring the su
mmer screen
s
are installed on
all roof w
indo
ws a
s well as
on the
back w
indo
ws on
the
firs
t flo
or 2 tree
s in front of the
windo
ws will provide
sufficient sha
dow on the grou
nd
floor
Com
pact unit with
hea
t pu
mp an
d co
nnec
ted to the
solar thermal collector via a 30
0l buffer tank
This is
used
for the do
mes
tic w
arm w
ater
Front a
nd rea
rview
of the
hous
e
tree
s forna
turalsha
ding
CO
NSTR
UC
TIO
N
Roof co
nst
ruct
ion (new
) U
-val
ue 0
12
W(
msup2middot
K)
(top
dow
n)
-Roo
f tiles
50 m
m
-Woo
d-fib
erbo
ard
22 m
m
-Rafter + cellulose
82 m
m
-Woo
den I-be
ams + cellulose
30
0 mm
-OSB
15 m
m
-La
thwork
22 m
m
-Gyp
sum Fibrebo
ard
125 m
m
Total
5035 mm
Wal
l const
ruct
ion
U-v
alue
01
26 W
(m
sup2middotK
)
(interio
r to exterior)
-Interio
r plas
ter
15 m
m
-Con
crete bloc
ks19
0 mm
-Woo
den I-be
ams + cellulose
(ne
w) 240
mm
-Woo
d-fib
re boa
rd (ha
rdbo
ard) (ne
w)
18 m
m
-Woo
d-fib
re boa
rd (so
ft bo
ard) (ne
w)
60 m
m
-Exterior stuc
co (ne
w)
20 m
m
Total
543 mm
Flo
or co
nst
ruct
ion
U-v
alue
00
86 W
(m
sup2middotK
)
(top
dow
n)
-Lino
leum
(ne
w)
6 mm
-Scree
d (new
)70
mm
-Phe
nolic
rigid boa
rd in
sulatio
n (new
)26
0 mm
-Con
crete slab
150 mm
Total
486 mm
Tim
ber fram
e co
nstruc
tion fix
ed to
the ex
istin
g wall The
originally w
all w
as erected
with
con
crete bloc
ks b
ut during
the retrofit an
d the ad
aptatio
n of th
e windo
ws so
me clay
tile
bloc
ks w
ere bu
ild in
RE
PLA
CIN
G T
HE O
UTS
IDE B
RIC
K F
AC
AD
E
The
old h
ouse
was
built with
a traditio
nal ca
vity
wall
cons
truc
tion
with
out
insu
latio
n
Afte
r
cons
ultatio
n with
the
con
trac
tor the
outside
wall
was
rem
oved
to b
e replac
ed b
y a
timbe
r fram
e
cons
truc
tion fixed
to th
e inne
r walls c
ontaining the
insu
latio
n laye
r
During co
nstruc
tion it bec
ame clea
r that the
inne
r
wall was
far
from
straight In so
me
plac
es a
diffe
renc
e of 7 cm had
to be ga
pped
The
hou
se afte
r dism
antling
the walls
The
con
struction of th
e co
mmon
wall
REA
CH
ING
PA
SSIV
E H
OU
SE S
TA
ND
AR
D
The
first
PHPP
calculation
of
the
projec
t
unde
rline
d ho
w big
the
challeng
e wou
ld be
to
reac
h pa
ssive stan
dard Following ch
ange
s were
mad
e to the
orig
inal des
ign in orde
r to rea
ch the
target stand
ard
bullThe
insu
latio
n laye
r in the
walls was
increa
sed
bullThe
size
of the
windo
ws
was
op
timized
allowing
for
bigg
er windo
ws
at the
back
(wes
t-side
)
bullThe
skylights
and
light tun
nel on
the
eas
t
originally plan
ned were
deleted
beca
use
they
wou
ldnrsquot d
eliver eno
ugh so
lar ga
ins
bullThe
flo
or insu
latio
n type
was
ch
ange
d
towards
a
less
ecolog
ical
but
high
er
performan
ce material (26c
m Phe
nolic
rigid
board in stead
of c
ellulose
)
EN
SU
RIN
G A
IR T
IGH
TN
ES
S
Bec
ause
of the
mixed
struc
ture o
f so
lid a
nd tim
ber
cons
truc
tion the
conn
ectio
ns be
twee
n them
were
critica
l po
ints Spe
cial b
ands
tha
t ca
n be
plastered
were us
ed to
mak
e this con
nection
A firs
t air tig
htne
ss tes
t sh
owed
an infiltration rate of
056
h-1 at 50
Pa pres
sure differen
ce (n 5
0) The
big
leak
s that rem
aine
d were situated
at the pa
ssag
e of
the
solar
collector pipe
s throug
h the
roof (eve
n
thou
ght they
were
tape
d off as
goo
d as
pos
sible)
the pa
ssag
e of an old elec
tricity cab
le in
the
old floor
and the interrup
tion of the
stucco at the
bas
e of the
wall in the co
rner betwee
n co
mmon
wall a
nd fa
ccedilade
Tap
ing off the
OSB boa
rds
and co
nnec
tion be
twee
n
OSB and
plaster on the
brick walls (the white ban
d
in th
e up
per ph
oto)
TH
ER
MA
L B
RID
GE
S A
ND
SO
LU
TIO
NS
Res
olving
the
the
rmal brid
ges be
came an
add
ition
al
challeng
e m
ainly be
caus
e the startin
g po
int was
an
alread
y ex
istin
g structure The
mos
t im
portan
t
conn
ectio
ns were simulated
A classic the
rmal brid
ge w
hen retrofitting is the
bas
e
of the
wall
Calcu
latio
ns s
howed
itsrsquogrea
t im
pact
Bec
ause
a
moisture
resisting
barrier
had
to be
installed an
yway
it was
dec
ided
to replac
e the first
laye
r of bric
ks by ce
llular co
ncrete
The
joint be
twee
n faccedila
de an
d co
mmon
wall was
anothe
r prob
lematic co
nnec
tion Here no
real
solutio
n was
foun
d bu
t ad
ding
an
ad
ditio
nal
insu
latio
n laye
r on
the
inne
r wall at leas
t grea
tly
redu
ced the thermal brid
ging
effe
ct
Finally the
installatio
n of the
roof windo
ws
was
stud
ied B
ecau
se o
f their po
sitio
ning
outside
of the
roof co
nstruc
tion the
thermal bridging
effect was
even
greater To redu
ce this a sec
ond windo
w w
as
plac
ed und
erne
ath the roof windo
w
The
rmal break
at the
bas
e of th
e walls
Con
nection tres
hold
with
fron
tdoo
r
Detail a
nd th
ermal brid
ge sim
ulation of th
e co
nnec
tion be
twee
n faccedila
de and
common
wall
Detail a
nd th
ermal brid
ge sim
ulation of th
e co
nnec
tion be
twee
n roof windo
w
and inne
r windo
w
The
roo
f windo
ws an
d the so
lar thermal collector
Ψlt 001 Wm
K
Ψlt 001 Wm
K
SU
STA
INA
BLE M
ATER
IALS
For cho
osing the bu
ilding materials their ec
olog
ical
value
was
tak
en into
acco
unt
FSC lab
eled
tim
ber
was
us
ed
for
the
timbe
r fram
e co
nstruc
tion
Cellulose
insu
latio
n was
use
d for the walls and
roo
f
Only in the
floor a che
mical ins
ulation material was
used
(Fen
ol-in
sulatio
n)
An
interio
r plas
ter ba
sed
on na
tural gy
psum
was
used
for the
mas
onry w
alls Cork an
d linoleu
m w
ere
applied as
floo
r de
cking A m
ineral stucco ap
plied on
a woo
d fib
er in
sulatio
n plate was
use
d as
an ex
terio
r
finishing
A fin
al as
pect of su
staina
bility
is the
reus
e of
rainwater In front of the ho
use a rain w
ater tan
k of
5000
l is plac
ed 2 toilets and
a w
ashing
mac
hine
are
conn
ected
to it
This
way
the
use
of tap
water is
redu
ced to a m
inim
um
Mec
hanica
l ven
tilation un
it
CO
ST A
NA
LIS
YS
The
ren
ovation
to p
assive
hou
se stand
ard
was
not
eviden
t This tran
slates
into the co
st of the projec
t
This also
reflects the un
favo
rable
orientation
of the
dwelling the
refore add
ition
al in
sulatio
n was
nee
ded
On
the
othe
r ha
nd the
redu
ced
VAT rate various
gran
ts and
a fed
eral tax
ded
uctio
n for retrofitting to
passive
hous
e stan
dard mak
e it
all ec
onom
ically
viab
le in
times
of h
igh en
ergy
pric
es
CO
NC
LU
SIO
NS
Whe
n the ow
ners firs
t form
ulated
the
ir drea
m of an
ecolog
ical ne
w ho
me their wishe
s were
far from
met Afte
r ha
ving
fou
nd a
n ex
perie
nced
architect
eage
r to rea
lize
their drea
m the
end
resu
lt was
a
sustaina
ble
and
ecolog
ical pa
ssive
hous
e retrofit
The
project fully u
ses
the
existin
g po
tential of the
building and
cha
nges
the rest fo
r the be
tter
The
proce
ss w
as n
ot a
n ea
sy o
ne tho
ugh S
olving
thermal brid
ges in
corporating air tig
htne
ss solutions
deve
loping
an
efficient ven
tilation
strategy
and
las
t
but no
t leas
t ke
eping the bu
dget w
ithin rea
sona
ble
margins
req
uired co
mmitm
ent a
nd study
work
An elec
trical res
istanc
e for po
st hea
ting the living area
sCos
t diagram
2 7
54
043
9
13
2
1
1
2
20
0
blowerdoor
demolition roof
scaffold
contractor carcass
facade structure
carcass
contractor wooden structure and finishing
EPDM
Cellular glas
Cork (incl bathroom)
Inner plaster
Exterior stucco
Water
electricity
Sum
mar
y of U
-val
ues
W(m
sup2K
)R
EN
EW
AB
LE E
NER
GY U
SE
Solar hea
ting co
llector flat p
late collector 8
msup2
storag
e vo
lume 30
0l
EN
ER
GY P
ER
FO
RM
AN
CE
Spa
ce + w
ater hea
ting (prim
ary en
ergy
)
Before
450 kW
hmsup2a
Afte
r67
kWhmsup2a
Red
uctio
n
85
Flemish im
plem
entatio
nof EPBD
INFO
RM
ATIO
N S
OU
RC
ES
Alexis Verse
le Architecten
PHP vzw
Bro
chure
auth
ors
Wou
terHilderso
npa
ssiefhuisp
latfo
rmbe
Joha
nCre
passiefhuisp
latfo
rmbe
This rese
arch
was
exe
cuted with
in the
framew
ork of
the
LEHR projec
t (w
wwle
hrbe)
grou
ping
three
rese
arch
tea
ms (PHPPMP Architecture et C
limat ndash
UCL BBRI)
on ac
coun
t of the
Belgian
Fed
eral
Scien
ce
Policy
exec
uting
the
ldquoProgram
me
to
stim
ulate
know
ledg
e tran
sfer in area
s of strategic
impo
rtan
cerdquo
Before
Afte
r
Roo
f55
012
Walls
19
012
6
Bas
emen
t ceiling
27
008
6
Windo
ws
5074
BU
ILD
ING
SER
VIC
ES
Mec
hanica
l ve
ntilatio
n sy
stem
with
a
coun
ter flo
w
heat excha
nger (η=
84)
An
elec
trical d
ecen
tral
post-hea
ter (120
0W) warms
the ve
ntilatio
n air go
ing to the
living room
Add
ition
al
elec
tric he
aters
can
heat the
air
going
to the
bedroo
ms
as de
sired In the
bathroom
an
ex
tra
elec
trical h
eater is ins
talled
beca
use
of the
highe
r
comfort te
mpe
ratures that are req
uired there
To prev
ent ov
erhe
ating du
ring the su
mmer screen
s
are installed on
all roof w
indo
ws a
s well as
on the
back w
indo
ws on
the
firs
t flo
or 2 tree
s in front of the
windo
ws will provide
sufficient sha
dow on the grou
nd
floor
Com
pact unit with
hea
t pu
mp an
d co
nnec
ted to the
solar thermal collector via a 30
0l buffer tank
This is
used
for the do
mes
tic w
arm w
ater
Front a
nd rea
rview
of the
hous
e
tree
s forna
turalsha
ding
RE
PLA
CIN
G T
HE O
UTS
IDE B
RIC
K F
AC
AD
E
The
old h
ouse
was
built with
a traditio
nal ca
vity
wall
cons
truc
tion
with
out
insu
latio
n
Afte
r
cons
ultatio
n with
the
con
trac
tor the
outside
wall
was
rem
oved
to b
e replac
ed b
y a
timbe
r fram
e
cons
truc
tion fixed
to th
e inne
r walls c
ontaining the
insu
latio
n laye
r
During co
nstruc
tion it bec
ame clea
r that the
inne
r
wall was
far
from
straight In so
me
plac
es a
diffe
renc
e of 7 cm had
to be ga
pped
The
hou
se afte
r dism
antling
the walls
The
con
struction of th
e co
mmon
wall
REA
CH
ING
PA
SSIV
E H
OU
SE S
TA
ND
AR
D
The
first
PHPP
calculation
of
the
projec
t
unde
rline
d ho
w big
the
challeng
e wou
ld be
to
reac
h pa
ssive stan
dard Following ch
ange
s were
mad
e to the
orig
inal des
ign in orde
r to rea
ch the
target stand
ard
bullThe
insu
latio
n laye
r in the
walls was
increa
sed
bullThe
size
of the
windo
ws
was
op
timized
allowing
for
bigg
er windo
ws
at the
back
(wes
t-side
)
bullThe
skylights
and
light tun
nel on
the
eas
t
originally plan
ned were
deleted
beca
use
they
wou
ldnrsquot d
eliver eno
ugh so
lar ga
ins
bullThe
flo
or insu
latio
n type
was
ch
ange
d
towards
a
less
ecolog
ical
but
high
er
performan
ce material (26c
m Phe
nolic
rigid
board in stead
of c
ellulose
)
EN
SU
RIN
G A
IR T
IGH
TN
ES
S
Bec
ause
of the
mixed
struc
ture o
f so
lid a
nd tim
ber
cons
truc
tion the
conn
ectio
ns be
twee
n them
were
critica
l po
ints Spe
cial b
ands
tha
t ca
n be
plastered
were us
ed to
mak
e this con
nection
A firs
t air tig
htne
ss tes
t sh
owed
an infiltration rate of
056
h-1 at 50
Pa pres
sure differen
ce (n 5
0) The
big
leak
s that rem
aine
d were situated
at the pa
ssag
e of
the
solar
collector pipe
s throug
h the
roof (eve
n
thou
ght they
were
tape
d off as
goo
d as
pos
sible)
the pa
ssag
e of an old elec
tricity cab
le in
the
old floor
and the interrup
tion of the
stucco at the
bas
e of the
wall in the co
rner betwee
n co
mmon
wall a
nd fa
ccedilade
Tap
ing off the
OSB boa
rds
and co
nnec
tion be
twee
n
OSB and
plaster on the
brick walls (the white ban
d
in th
e up
per ph
oto)
TH
ER
MA
L B
RID
GE
S A
ND
SO
LU
TIO
NS
Res
olving
the
the
rmal brid
ges be
came an
add
ition
al
challeng
e m
ainly be
caus
e the startin
g po
int was
an
alread
y ex
istin
g structure The
mos
t im
portan
t
conn
ectio
ns were simulated
A classic the
rmal brid
ge w
hen retrofitting is the
bas
e
of the
wall
Calcu
latio
ns s
howed
itsrsquogrea
t im
pact
Bec
ause
a
moisture
resisting
barrier
had
to be
installed an
yway
it was
dec
ided
to replac
e the first
laye
r of bric
ks by ce
llular co
ncrete
The
joint be
twee
n faccedila
de an
d co
mmon
wall was
anothe
r prob
lematic co
nnec
tion Here no
real
solutio
n was
foun
d bu
t ad
ding
an
ad
ditio
nal
insu
latio
n laye
r on
the
inne
r wall at leas
t grea
tly
redu
ced the thermal brid
ging
effe
ct
Finally the
installatio
n of the
roof windo
ws
was
stud
ied B
ecau
se o
f their po
sitio
ning
outside
of the
roof co
nstruc
tion the
thermal bridging
effect was
even
greater To redu
ce this a sec
ond windo
w w
as
plac
ed und
erne
ath the roof windo
w
The
rmal break
at the
bas
e of th
e walls
Con
nection tres
hold
with
fron
tdoo
r
Detail a
nd th
ermal brid
ge sim
ulation of th
e co
nnec
tion be
twee
n faccedila
de and
common
wall
Detail a
nd th
ermal brid
ge sim
ulation of th
e co
nnec
tion be
twee
n roof windo
w
and inne
r windo
w
The
roo
f windo
ws an
d the so
lar thermal collector
Ψlt 001 Wm
K
Ψlt 001 Wm
K
SU
STA
INA
BLE M
ATER
IALS
For cho
osing the bu
ilding materials their ec
olog
ical
value
was
tak
en into
acco
unt
FSC lab
eled
tim
ber
was
us
ed
for
the
timbe
r fram
e co
nstruc
tion
Cellulose
insu
latio
n was
use
d for the walls and
roo
f
Only in the
floor a che
mical ins
ulation material was
used
(Fen
ol-in
sulatio
n)
An
interio
r plas
ter ba
sed
on na
tural gy
psum
was
used
for the
mas
onry w
alls Cork an
d linoleu
m w
ere
applied as
floo
r de
cking A m
ineral stucco ap
plied on
a woo
d fib
er in
sulatio
n plate was
use
d as
an ex
terio
r
finishing
A fin
al as
pect of su
staina
bility
is the
reus
e of
rainwater In front of the ho
use a rain w
ater tan
k of
5000
l is plac
ed 2 toilets and
a w
ashing
mac
hine
are
conn
ected
to it
This
way
the
use
of tap
water is
redu
ced to a m
inim
um
Mec
hanica
l ven
tilation un
it
CO
ST A
NA
LIS
YS
The
ren
ovation
to p
assive
hou
se stand
ard
was
not
eviden
t This tran
slates
into the co
st of the projec
t
This also
reflects the un
favo
rable
orientation
of the
dwelling the
refore add
ition
al in
sulatio
n was
nee
ded
On
the
othe
r ha
nd the
redu
ced
VAT rate various
gran
ts and
a fed
eral tax
ded
uctio
n for retrofitting to
passive
hous
e stan
dard mak
e it
all ec
onom
ically
viab
le in
times
of h
igh en
ergy
pric
es
CO
NC
LU
SIO
NS
Whe
n the ow
ners firs
t form
ulated
the
ir drea
m of an
ecolog
ical ne
w ho
me their wishe
s were
far from
met Afte
r ha
ving
fou
nd a
n ex
perie
nced
architect
eage
r to rea
lize
their drea
m the
end
resu
lt was
a
sustaina
ble
and
ecolog
ical pa
ssive
hous
e retrofit
The
project fully u
ses
the
existin
g po
tential of the
building and
cha
nges
the rest fo
r the be
tter
The
proce
ss w
as n
ot a
n ea
sy o
ne tho
ugh S
olving
thermal brid
ges in
corporating air tig
htne
ss solutions
deve
loping
an
efficient ven
tilation
strategy
and
las
t
but no
t leas
t ke
eping the bu
dget w
ithin rea
sona
ble
margins
req
uired co
mmitm
ent a
nd study
work
An elec
trical res
istanc
e for po
st hea
ting the living area
sCos
t diagram
2 7
54
043
9
13
2
1
1
2
20
0
blowerdoor
demolition roof
scaffold
contractor carcass
facade structure
carcass
contractor wooden structure and finishing
EPDM
Cellular glas
Cork (incl bathroom)
Inner plaster
Exterior stucco
Water
electricity
Sum
mar
y of U
-val
ues
W(m
sup2K
)R
EN
EW
AB
LE E
NER
GY U
SE
Solar hea
ting co
llector flat p
late collector 8
msup2
storag
e vo
lume 30
0l
EN
ER
GY P
ER
FO
RM
AN
CE
Spa
ce + w
ater hea
ting (prim
ary en
ergy
)
Before
450 kW
hmsup2a
Afte
r67
kWhmsup2a
Red
uctio
n
85
Flemish im
plem
entatio
nof EPBD
INFO
RM
ATIO
N S
OU
RC
ES
Alexis Verse
le Architecten
PHP vzw
Bro
chure
auth
ors
Wou
terHilderso
npa
ssiefhuisp
latfo
rmbe
Joha
nCre
passiefhuisp
latfo
rmbe
This rese
arch
was
exe
cuted with
in the
framew
ork of
the
LEHR projec
t (w
wwle
hrbe)
grou
ping
three
rese
arch
tea
ms (PHPPMP Architecture et C
limat ndash
UCL BBRI)
on ac
coun
t of the
Belgian
Fed
eral
Scien
ce
Policy
exec
uting
the
ldquoProgram
me
to
stim
ulate
know
ledg
e tran
sfer in area
s of strategic
impo
rtan
cerdquo
Before
Afte
r
Roo
f55
012
Walls
19
012
6
Bas
emen
t ceiling
27
008
6
Windo
ws
5074
BU
ILD
ING
SER
VIC
ES
Mec
hanica
l ve
ntilatio
n sy
stem
with
a
coun
ter flo
w
heat excha
nger (η=
84)
An
elec
trical d
ecen
tral
post-hea
ter (120
0W) warms
the ve
ntilatio
n air go
ing to the
living room
Add
ition
al
elec
tric he
aters
can
heat the
air
going
to the
bedroo
ms
as de
sired In the
bathroom
an
ex
tra
elec
trical h
eater is ins
talled
beca
use
of the
highe
r
comfort te
mpe
ratures that are req
uired there
To prev
ent ov
erhe
ating du
ring the su
mmer screen
s
are installed on
all roof w
indo
ws a
s well as
on the
back w
indo
ws on
the
firs
t flo
or 2 tree
s in front of the
windo
ws will provide
sufficient sha
dow on the grou
nd
floor
Com
pact unit with
hea
t pu
mp an
d co
nnec
ted to the
solar thermal collector via a 30
0l buffer tank
This is
used
for the do
mes
tic w
arm w
ater
Front a
nd rea
rview
of the
hous
e
tree
s forna
turalsha
ding
TH
ER
MA
L B
RID
GE
S A
ND
SO
LU
TIO
NS
Res
olving
the
the
rmal brid
ges be
came an
add
ition
al
challeng
e m
ainly be
caus
e the startin
g po
int was
an
alread
y ex
istin
g structure The
mos
t im
portan
t
conn
ectio
ns were simulated
A classic the
rmal brid
ge w
hen retrofitting is the
bas
e
of the
wall
Calcu
latio
ns s
howed
itsrsquogrea
t im
pact
Bec
ause
a
moisture
resisting
barrier
had
to be
installed an
yway
it was
dec
ided
to replac
e the first
laye
r of bric
ks by ce
llular co
ncrete
The
joint be
twee
n faccedila
de an
d co
mmon
wall was
anothe
r prob
lematic co
nnec
tion Here no
real
solutio
n was
foun
d bu
t ad
ding
an
ad
ditio
nal
insu
latio
n laye
r on
the
inne
r wall at leas
t grea
tly
redu
ced the thermal brid
ging
effe
ct
Finally the
installatio
n of the
roof windo
ws
was
stud
ied B
ecau
se o
f their po
sitio
ning
outside
of the
roof co
nstruc
tion the
thermal bridging
effect was
even
greater To redu
ce this a sec
ond windo
w w
as
plac
ed und
erne
ath the roof windo
w
The
rmal break
at the
bas
e of th
e walls
Con
nection tres
hold
with
fron
tdoo
r
Detail a
nd th
ermal brid
ge sim
ulation of th
e co
nnec
tion be
twee
n faccedila
de and
common
wall
Detail a
nd th
ermal brid
ge sim
ulation of th
e co
nnec
tion be
twee
n roof windo
w
and inne
r windo
w
The
roo
f windo
ws an
d the so
lar thermal collector
Ψlt 001 Wm
K
Ψlt 001 Wm
K
SU
STA
INA
BLE M
ATER
IALS
For cho
osing the bu
ilding materials their ec
olog
ical
value
was
tak
en into
acco
unt
FSC lab
eled
tim
ber
was
us
ed
for
the
timbe
r fram
e co
nstruc
tion
Cellulose
insu
latio
n was
use
d for the walls and
roo
f
Only in the
floor a che
mical ins
ulation material was
used
(Fen
ol-in
sulatio
n)
An
interio
r plas
ter ba
sed
on na
tural gy
psum
was
used
for the
mas
onry w
alls Cork an
d linoleu
m w
ere
applied as
floo
r de
cking A m
ineral stucco ap
plied on
a woo
d fib
er in
sulatio
n plate was
use
d as
an ex
terio
r
finishing
A fin
al as
pect of su
staina
bility
is the
reus
e of
rainwater In front of the ho
use a rain w
ater tan
k of
5000
l is plac
ed 2 toilets and
a w
ashing
mac
hine
are
conn
ected
to it
This
way
the
use
of tap
water is
redu
ced to a m
inim
um
Mec
hanica
l ven
tilation un
it
CO
ST A
NA
LIS
YS
The
ren
ovation
to p
assive
hou
se stand
ard
was
not
eviden
t This tran
slates
into the co
st of the projec
t
This also
reflects the un
favo
rable
orientation
of the
dwelling the
refore add
ition
al in
sulatio
n was
nee
ded
On
the
othe
r ha
nd the
redu
ced
VAT rate various
gran
ts and
a fed
eral tax
ded
uctio
n for retrofitting to
passive
hous
e stan
dard mak
e it
all ec
onom
ically
viab
le in
times
of h
igh en
ergy
pric
es
CO
NC
LU
SIO
NS
Whe
n the ow
ners firs
t form
ulated
the
ir drea
m of an
ecolog
ical ne
w ho
me their wishe
s were
far from
met Afte
r ha
ving
fou
nd a
n ex
perie
nced
architect
eage
r to rea
lize
their drea
m the
end
resu
lt was
a
sustaina
ble
and
ecolog
ical pa
ssive
hous
e retrofit
The
project fully u
ses
the
existin
g po
tential of the
building and
cha
nges
the rest fo
r the be
tter
The
proce
ss w
as n
ot a
n ea
sy o
ne tho
ugh S
olving
thermal brid
ges in
corporating air tig
htne
ss solutions
deve
loping
an
efficient ven
tilation
strategy
and
las
t
but no
t leas
t ke
eping the bu
dget w
ithin rea
sona
ble
margins
req
uired co
mmitm
ent a
nd study
work
An elec
trical res
istanc
e for po
st hea
ting the living area
sCos
t diagram
2 7
54
043
9
13
2
1
1
2
20
0
blowerdoor
demolition roof
scaffold
contractor carcass
facade structure
carcass
contractor wooden structure and finishing
EPDM
Cellular glas
Cork (incl bathroom)
Inner plaster
Exterior stucco
Water
electricity
Sum
mar
y of U
-val
ues
W(m
sup2K
)R
EN
EW
AB
LE E
NER
GY U
SE
Solar hea
ting co
llector flat p
late collector 8
msup2
storag
e vo
lume 30
0l
EN
ER
GY P
ER
FO
RM
AN
CE
Spa
ce + w
ater hea
ting (prim
ary en
ergy
)
Before
450 kW
hmsup2a
Afte
r67
kWhmsup2a
Red
uctio
n
85
Flemish im
plem
entatio
nof EPBD
INFO
RM
ATIO
N S
OU
RC
ES
Alexis Verse
le Architecten
PHP vzw
Bro
chure
auth
ors
Wou
terHilderso
npa
ssiefhuisp
latfo
rmbe
Joha
nCre
passiefhuisp
latfo
rmbe
This rese
arch
was
exe
cuted with
in the
framew
ork of
the
LEHR projec
t (w
wwle
hrbe)
grou
ping
three
rese
arch
tea
ms (PHPPMP Architecture et C
limat ndash
UCL BBRI)
on ac
coun
t of the
Belgian
Fed
eral
Scien
ce
Policy
exec
uting
the
ldquoProgram
me
to
stim
ulate
know
ledg
e tran
sfer in area
s of strategic
impo
rtan
cerdquo
Before
Afte
r
Roo
f55
012
Walls
19
012
6
Bas
emen
t ceiling
27
008
6
Windo
ws
5074
BU
ILD
ING
SER
VIC
ES
Mec
hanica
l ve
ntilatio
n sy
stem
with
a
coun
ter flo
w
heat excha
nger (η=
84)
An
elec
trical d
ecen
tral
post-hea
ter (120
0W) warms
the ve
ntilatio
n air go
ing to the
living room
Add
ition
al
elec
tric he
aters
can
heat the
air
going
to the
bedroo
ms
as de
sired In the
bathroom
an
ex
tra
elec
trical h
eater is ins
talled
beca
use
of the
highe
r
comfort te
mpe
ratures that are req
uired there
To prev
ent ov
erhe
ating du
ring the su
mmer screen
s
are installed on
all roof w
indo
ws a
s well as
on the
back w
indo
ws on
the
firs
t flo
or 2 tree
s in front of the
windo
ws will provide
sufficient sha
dow on the grou
nd
floor
Com
pact unit with
hea
t pu
mp an
d co
nnec
ted to the
solar thermal collector via a 30
0l buffer tank
This is
used
for the do
mes
tic w
arm w
ater
Front a
nd rea
rview
of the
hous
e
tree
s forna
turalsha
ding
SU
STA
INA
BLE M
ATER
IALS
For cho
osing the bu
ilding materials their ec
olog
ical
value
was
tak
en into
acco
unt
FSC lab
eled
tim
ber
was
us
ed
for
the
timbe
r fram
e co
nstruc
tion
Cellulose
insu
latio
n was
use
d for the walls and
roo
f
Only in the
floor a che
mical ins
ulation material was
used
(Fen
ol-in
sulatio
n)
An
interio
r plas
ter ba
sed
on na
tural gy
psum
was
used
for the
mas
onry w
alls Cork an
d linoleu
m w
ere
applied as
floo
r de
cking A m
ineral stucco ap
plied on
a woo
d fib
er in
sulatio
n plate was
use
d as
an ex
terio
r
finishing
A fin
al as
pect of su
staina
bility
is the
reus
e of
rainwater In front of the ho
use a rain w
ater tan
k of
5000
l is plac
ed 2 toilets and
a w
ashing
mac
hine
are
conn
ected
to it
This
way
the
use
of tap
water is
redu
ced to a m
inim
um
Mec
hanica
l ven
tilation un
it
CO
ST A
NA
LIS
YS
The
ren
ovation
to p
assive
hou
se stand
ard
was
not
eviden
t This tran
slates
into the co
st of the projec
t
This also
reflects the un
favo
rable
orientation
of the
dwelling the
refore add
ition
al in
sulatio
n was
nee
ded
On
the
othe
r ha
nd the
redu
ced
VAT rate various
gran
ts and
a fed
eral tax
ded
uctio
n for retrofitting to
passive
hous
e stan
dard mak
e it
all ec
onom
ically
viab
le in
times
of h
igh en
ergy
pric
es
CO
NC
LU
SIO
NS
Whe
n the ow
ners firs
t form
ulated
the
ir drea
m of an
ecolog
ical ne
w ho
me their wishe
s were
far from
met Afte
r ha
ving
fou
nd a
n ex
perie
nced
architect
eage
r to rea
lize
their drea
m the
end
resu
lt was
a
sustaina
ble
and
ecolog
ical pa
ssive
hous
e retrofit
The
project fully u
ses
the
existin
g po
tential of the
building and
cha
nges
the rest fo
r the be
tter
The
proce
ss w
as n
ot a
n ea
sy o
ne tho
ugh S
olving
thermal brid
ges in
corporating air tig
htne
ss solutions
deve
loping
an
efficient ven
tilation
strategy
and
las
t
but no
t leas
t ke
eping the bu
dget w
ithin rea
sona
ble
margins
req
uired co
mmitm
ent a
nd study
work
An elec
trical res
istanc
e for po
st hea
ting the living area
sCos
t diagram
2 7
54
043
9
13
2
1
1
2
20
0
blowerdoor
demolition roof
scaffold
contractor carcass
facade structure
carcass
contractor wooden structure and finishing
EPDM
Cellular glas
Cork (incl bathroom)
Inner plaster
Exterior stucco
Water
electricity
Sum
mar
y of U
-val
ues
W(m
sup2K
)R
EN
EW
AB
LE E
NER
GY U
SE
Solar hea
ting co
llector flat p
late collector 8
msup2
storag
e vo
lume 30
0l
EN
ER
GY P
ER
FO
RM
AN
CE
Spa
ce + w
ater hea
ting (prim
ary en
ergy
)
Before
450 kW
hmsup2a
Afte
r67
kWhmsup2a
Red
uctio
n
85
Flemish im
plem
entatio
nof EPBD
INFO
RM
ATIO
N S
OU
RC
ES
Alexis Verse
le Architecten
PHP vzw
Bro
chure
auth
ors
Wou
terHilderso
npa
ssiefhuisp
latfo
rmbe
Joha
nCre
passiefhuisp
latfo
rmbe
This rese
arch
was
exe
cuted with
in the
framew
ork of
the
LEHR projec
t (w
wwle
hrbe)
grou
ping
three
rese
arch
tea
ms (PHPPMP Architecture et C
limat ndash
UCL BBRI)
on ac
coun
t of the
Belgian
Fed
eral
Scien
ce
Policy
exec
uting
the
ldquoProgram
me
to
stim
ulate
know
ledg
e tran
sfer in area
s of strategic
impo
rtan
cerdquo
Before
Afte
r
Roo
f55
012
Walls
19
012
6
Bas
emen
t ceiling
27
008
6
Windo
ws
5074
BU
ILD
ING
SER
VIC
ES
Mec
hanica
l ve
ntilatio
n sy
stem
with
a
coun
ter flo
w
heat excha
nger (η=
84)
An
elec
trical d
ecen
tral
post-hea
ter (120
0W) warms
the ve
ntilatio
n air go
ing to the
living room
Add
ition
al
elec
tric he
aters
can
heat the
air
going
to the
bedroo
ms
as de
sired In the
bathroom
an
ex
tra
elec
trical h
eater is ins
talled
beca
use
of the
highe
r
comfort te
mpe
ratures that are req
uired there
To prev
ent ov
erhe
ating du
ring the su
mmer screen
s
are installed on
all roof w
indo
ws a
s well as
on the
back w
indo
ws on
the
firs
t flo
or 2 tree
s in front of the
windo
ws will provide
sufficient sha
dow on the grou
nd
floor
Com
pact unit with
hea
t pu
mp an
d co
nnec
ted to the
solar thermal collector via a 30
0l buffer tank
This is
used
for the do
mes
tic w
arm w
ater
Front a
nd rea
rview
of the
hous
e
tree
s forna
turalsha
ding
Sum
mar
y of U
-val
ues
W(m
sup2K
)R
EN
EW
AB
LE E
NER
GY U
SE
Solar hea
ting co
llector flat p
late collector 8
msup2
storag
e vo
lume 30
0l
EN
ER
GY P
ER
FO
RM
AN
CE
Spa
ce + w
ater hea
ting (prim
ary en
ergy
)
Before
450 kW
hmsup2a
Afte
r67
kWhmsup2a
Red
uctio
n
85
Flemish im
plem
entatio
nof EPBD
INFO
RM
ATIO
N S
OU
RC
ES
Alexis Verse
le Architecten
PHP vzw
Bro
chure
auth
ors
Wou
terHilderso
npa
ssiefhuisp
latfo
rmbe
Joha
nCre
passiefhuisp
latfo
rmbe
This rese
arch
was
exe
cuted with
in the
framew
ork of
the
LEHR projec
t (w
wwle
hrbe)
grou
ping
three
rese
arch
tea
ms (PHPPMP Architecture et C
limat ndash
UCL BBRI)
on ac
coun
t of the
Belgian
Fed
eral
Scien
ce
Policy
exec
uting
the
ldquoProgram
me
to
stim
ulate
know
ledg
e tran
sfer in area
s of strategic
impo
rtan
cerdquo
Before
Afte
r
Roo
f55
012
Walls
19
012
6
Bas
emen
t ceiling
27
008
6
Windo
ws
5074
BU
ILD
ING
SER
VIC
ES
Mec
hanica
l ve
ntilatio
n sy
stem
with
a
coun
ter flo
w
heat excha
nger (η=
84)
An
elec
trical d
ecen
tral
post-hea
ter (120
0W) warms
the ve
ntilatio
n air go
ing to the
living room
Add
ition
al
elec
tric he
aters
can
heat the
air
going
to the
bedroo
ms
as de
sired In the
bathroom
an
ex
tra
elec
trical h
eater is ins
talled
beca
use
of the
highe
r
comfort te
mpe
ratures that are req
uired there
To prev
ent ov
erhe
ating du
ring the su
mmer screen
s
are installed on
all roof w
indo
ws a
s well as
on the
back w
indo
ws on
the
firs
t flo
or 2 tree
s in front of the
windo
ws will provide
sufficient sha
dow on the grou
nd
floor
Com
pact unit with
hea
t pu
mp an
d co
nnec
ted to the
solar thermal collector via a 30
0l buffer tank
This is
used
for the do
mes
tic w
arm w
ater
Front a
nd rea
rview
of the
hous
e
tree
s forna
turalsha
ding
