7/26/2019 Straw Bale presentasi english

1/11

STRAW BALEAn introduction to low-impact building materials

M. KHABIB WAHUDI

7/26/2019 Straw Bale presentasi english

2/11

DEFINITIN

Straw is a renewable material o!ering goodt"ermal insulation properties and a muc"lower en#ironmental impact t"an man$current mainstream construction materials%

Straw bale is #er$ suitable as in&ll insulation'or timber'rame buildings wit" eit"er ane(ternal render or timber rainscreen &nis"%

Straw pro#ides a #apour-permeable wallconstruction using a locall$ sourced) low-impact material) alt"oug" it does need care'uldetailing and construction to a#oid t"e ingress

and retention o' moisture%

7/26/2019 Straw Bale presentasi english

3/11

*ISTR+

Straw "ouses "a#e been built on t"e A'ricanplains since t"e aleolit"ic Era%

Straw bales were used in construction ./ $earsago in 0erman$1

Straw-t"atc"ed roo's "a#e long been used innort"ern Europe and Asia%

In t"e New World) teepees were insulated inwinter wit" loose straw between t"e inner lining

and outer co#er% Since t"e .222s straw-bale construction "as

been substantiall$ re#i#ed) particularl$ in Nort"America) Europe) A'rica) and Australia%

7/26/2019 Straw Bale presentasi english

4/11

3*ARA3TERISTI3S

445 natural materials 6cradle to cradle concept7 *ig" insulation #alue - 8-#alue as low as 2)99 W:m.;

*ig" t"ermal mass

uic? assembl$ Eart"@ua?e resistant

Fire resistant up to 9.2min 6wit" applied cla$ plaster7

Eas$ to transport

All-$ear assembl$ possible ossible to appl$ cla$ plaster directl$ on t"e inside

straw sur'ace

Sa'e construction

7/26/2019 Straw Bale presentasi english

5/11

W*+ SE3IF+ STRAW BALE

Advantages A#oids t"ermal bridging and pro#ides good airtig"tness wit"

simple detailing

0ood insulation @ualities

Lig"tweig"t material wit" simple construction details and processes

Lig"t weig"t reduces load on 'oundations) reducing t"e need

'or materials wit" "ig" embodied energ$ 6eg concrete7

Low-cost renewable material) widel$ a#ailable 'rom local

sources) t"at stores carbon t"roug"out its li'e

Simple building s?ills suited to sel'-build and communit$

proCects

Suitable 'or in situ and pre'abricated approac"es

7/26/2019 Straw Bale presentasi english

6/11

Limitations

As an agricultural co-product) inconsistent properties6eg

dimensions) densit$ and moisture content7 can beproblematic

during construction

Details restricted b$ need to protect t"e straw 'rom

water ingress1 care'ul detailing needed 'or e(posed areas

Limited to relati#el$ lig"tweig"t &(ings

Limited water resilience 6gi#ing rise to concerns o#er

ood damage7 and problems 'or repair i' waterdamaged 6especiall$

loadbearing

walls7

Re@uires s"elter be'ore &nis"es can be applied

7/26/2019 Straw Bale presentasi english

7/11

STRAW BALE WALL 3NSTR83TIN SE>8EN3E

7/26/2019 Straw Bale presentasi english

8/11

7/26/2019 Straw Bale presentasi english

9/11

7/26/2019 Straw Bale presentasi english

10/11

7/26/2019 Straw Bale presentasi english

11/11

S8R3ES F INFRATIN

BRE and 8ni#ersit$ o' Bat"% Low-impact materials case studies%

Straw-bale auction rooms% A#ailable at www%bre%co%u?:page%CspidG.//4% Dic? ; and ;ra"n T%

Straw bale building s$stem researc" and ongoing researc" at t"eAlternati#e