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NOTE 1 This map is intended for sites in the United Kingdon, Isle of Man and Channel Islands only.

NOTE 2 The isopleths in the Irish Republic are shown for purposes of interpolation only.

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200

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Distance inside town terrain (km)

z -

h

(m

)

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0.94

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C

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!"#"#W !"##$!"%&'"(()&)"*+# !for flat roofs,

monopitch roofs, duopitch roofs and hipped

roofs [BS EN 1991-1-4:2005, 7.2.3 to 7.2.6]The recommended zones in BS EN 1991-1-4:2005, Figures 7.6, 7.7, 7.8 and 7.9 should be used respectively for flat roofs, monopitch roofs, duopitch roofs and hipped roofs.

BS EN 1991-1-4:2005, Tables 7.2, 7.3a), 7.3b), 7.4a), 7.4b), and 7.5 should not be used.

External pressure coefficients for flat roofs, monopitch roofs, duopitch roofs and hipped roofs are given in Tables NA.5, NA.6a), NA.6b), NA.7a) NA.7b) and NA.8.

Table NA.5 External pressure coefficients for flat roofs (Cpe,10 and Cpe,1)

Roof type Zone

F G H I

Sharp eaves 2.0 1,4 0,7 0,2

0,2

With parapets hp/e=0,05 1,9 1,3 0,7 0,2

0,2

hp/e=0,1 1,85 1,3 0,7 0,2

0,2

hp/e 0,20 1,4 1,0 0,7 0,2

0,2

Curved eaves r/e = 0,05 1,05 1,2 0,4 0,2

0,2

r/e = 0,10 0,75 0,8 0,3 0,2

0,2

r/e = 0,20 0,55 0,55 0,3 0,2

0,2

Mansard eaves a = 30 0,95 1,0 0,3 0,2

0,2

a = 45 1,2 1,3 0,4 0,2

0,2

a = 60 1,35 1,25 0,6 0,2

0,2

NOTE 1 For roofs with parapets or curved eaves, linear interpolation may be used for intermediate values of hp/h

and r/h.

NOTE 2 For roofs with mansard eaves, linear interpolation between a = 30, 45 and a = 60 may be used. For

a > 60 linear interpolation between the values for a = 60 and the values for flat roofs with sharp eaves may be

used.

NOTE 3 In Zone I, where positive and negative values are given, both values shall be considered.

NOTE 4 For the mansard eave itself, the external pressure coefficients are given in Table 7.4a) External pressure

coefficients for duopitch roofs: wind direction 0, Zone F and G, depending on the pitch angle of the mansard eave.

NOTE 5 For the curved eave itself, the external pressure coefficients are given by linear interpolation along the

curve, between values on the wall and on the roof.

NOTE 6 For mansard eaves with horizontal dimension less than e/10, the values for sharp eaves should be used.

For the definition of e see Figure 7.6"

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Table NA.6a) External pressure coefficients for monopitch roofs (Cpe,10 and Cpe,1)

Pitch angle a Zone for wind direction h = 0 Zone for wind direction h = 180

F G H F G H

5 1,8 1,2 0,6 2,4 1,1 0,8

+0,0 +0,0 +0,0

15 1,1 0,8 0,4 2,6 1,0 0,9

+0,2 +0,2 + 0,2

30 0,5 0,5 0,2 1,7 1,0 0,9

+0,8 +0,5 +0,4

45 0,0 0,0 0,0 0,9 0,8 0,9

+0,8 +0,6 +0,7

60 +0,8 +0,8 +0,8 1,0 0,7 0,7

75 +0,8 +0,8 +0,8 1,1 0,7 0,7

NOTE 1 At h = 0 (see Table NA.5) the pressure changes rapidly between positive and negative values around a

pitch angle of a = +5 to +45, so both positive and negative values are given. For those roofs, two cases should be

considered: one with all positive values, and one with all negative values. No mixing of positive and negative

values is allowed on the same face.

NOTE 2 Linear interpolation for intermediate pitch angles may be used between values of the same sign. The

values equal to 0,0 are given for interpolation purposes.

Table NA.6b) External pressure coefficients for monopitch roofs (Cpe,10 and Cpe,1)

Pitch angle a Zone for wind direction h = 90

Fup Flow G H I

5 2,2

+0,0

2,1

+0,0

1,1

+0,0

0,7

+0,0

0,7

+0,0

15 2,6

+0,2

1,6

+0,2

1,1

+0,2

0,8

+0,2

0,8

+0,2

30 1,7

+0,5

1,3

+0,5

1,2

+0,4

1,0

+0,3

0,8

+0,2

45 1,5

+0,6

1,3

+0,6

1,2

+0,5

1,0

+0,4

0,9

+0,3

60 1,2

+0,7

1,2

+0,7

1,2

+0,7

0,4

+0,5

0,2

+0,5

75 1,2

+0,8

1,2

+0,8

1,2

+0,8

0,4

+0,7

0,2

+0,6

NOTE Linear interpolation for intermediate pitch angles may be used between values of the same sign. The values

equal to 0,0 are given for interpolation purposes.

!

"

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Table NA.7a) External pressure coefficients for duopitch roofs (Cpe,10 and Cpe,1)

Pitch angle a Zone for wind direction h = 0

F G H I J

45 0,9 0,8 0,9 0,7 1,1

30 1,7 1,0 0,9 0,7 0,8

15 2,6 1,0 0,9 0,5 0,7

5 2,4 1,2 0,8 0,5 0,5

5 1,8 1,2 0,6 0,4 0,9

+0,0 +0,0 +0,0 0,4 0,9

15 1,1 0,8 0,4 0,5 1,3

+0,2 +0,2 +0,2 0,5 1,3

30 0,5 0,5 0,2 0,5 0,9

+0,8 +0,5 +0,4 0,5 0,9

45 0,0 0,0 0,0 0,5 0,8

+0,8 +0,6 +0,7 0,5 0,8

60 +0,8 +0,8 +0,8 0,6 0,8

75 +0,8 +0,8 +0,8 0,8 0,9

NOTE 1 At h = 0 the pressure changes rapidly between positive and negative values on the windward face around

a pitch angle of a = 5 to +45, so both positive and negative values are given. For those roofs, four cases should

be considered where the largest or smallest values of all areas F, G and H are combined with the largest or smallest

values in areas I and J. No mixing of positive and negative values is allowed on the same face.

NOTE 2 Linear interpolation for intermediate pitch angles of the same sign may be used between values of the

same sign. (Do not interpolate between a = +5 and a = 5, but use the data for flat roofs in 7.2.3). The values

equal to 0,0 are given for interpolation purposes.

!

"

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Table NA.7b) External pressure coefficients for duopitch roofs (Cpe,10 and Cpe,1)

Pitch angle a Zone for wind direction h = 90

F G H I

45 1,5 1,3 1,0 0,9

30 1,7 1,3 1,0 0,8

15 2,6 1,4 0,8 0,8

5 2,2 1,5 0,7 0,7

5 2,0

+0,0

1,1

+0,0

0,6

+0,0

0,5

+0,0

15 1,6

+0,2

1,5

+0,2

0,6

+0,2

0,4

+0,2

30 1,2

+0,5

1,1

+0,4

0,6

+0,3

0,5

+0,2

45 1,2

+0,6

1,2

+0,5

0,6

+0,4

0,4

+0,3

60 1,2

+0,7

1,2

+0,7

0,7

+0,5

0,6

+0,5

75 1,2

+0,8

1,2

+0,8

0,7

+0,7

0,6

+0,6

NOTE Linear interpolation for intermediate pitch angles of the same sign may be used between values of the same

sign. (Do not interpolate between a = +5 and a = 5, but use the data for flat roofs in BS EN 1991-1-4:2005,

7.2.3). The values equal to 0,0 are given for interpolation purposes.

!

"

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Table NA.8 External pressure coefficients for hipped roofs (Cpe,10 and Cpe,1)

Pitch

angle a

Zone for wind direction h = 0 and h = 90

F G H I J K L M N

45 1,4 1,0 1,0 0,7 0,7 0,4 1,1 1,0 0,9

30 2,3 1,2 1,0 0,7 1,3 0,8 1,0 1,0 0,8

15 2,6 1,0 0,9 0,6 1,4 1,3 0,9 0,9 0,8

5 2,3 1,1 0,8 0,6 0,8 0,6 1,1 0,8 0,8

5 1,8

+0,0

1,2

+0,0

0,6

+0,0

0,6

0,6

0,8

0,8

0,6

0,6

1,1

+0,0

0,6

+0,0

0,6

+0,0

15 1,3

+0,2

0,8

+0,2

0,5

+0,2

0,6

0,6

1,4

1,4

1,3

1,3

0,9

+0,0

0,6

+0,0

0,4

+0,0

30 0,5

+0,8

0,5

+0,5

0,2

+0,4

0,6

0,6

1,3

1,3

0,8

0,8

1,0

+0,0

0,6

+0,0

0,5

+0,0

45 0,0

+0,8

0,0

+0,6

0,0

+0,7

0,6

0,6

0,7

0,7

0,4

0,4

1,1

+0,0

0,6

+0,0

0,4

+0,0

60 +0,8 +0,8 +0,8 0,7 0,6 0,3 1,2 0,7 0,6

75 +0,8 +0,8 +0,8 1,2 0,6 0,3 1,2 0,7 0,6

NOTE 1 At h = 0 the pressures changes rapidly between positive and negative values on the windward face at pitch

angle of a = +5 to +45, so both positive and negative values are given. For those roofs, two cases should be

considered: one with all positive values, and one with all negative values. Positive and negative values should not be

mixed.

NOTE 2 Linear interpolation for intermediate pitch angles of the same sign may be used between values of the same

sign. The values equal to 0,0 are given for interpolation purposes.

NOTE 3 The pitch angle of the windward face always will govern the pressure coefficients."

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c (z) from Annex A of ENo

z 50m?

b = (c dir c season c prob. . ) b, map

q = 0.613 bb2

Y NIs orography significant?

(see Figure NA.2)

N

e = c (z) qbqp.

(obtain from Figure NA.7)c (z)e

e = c (z)qp. ((c (z)o + 0.6)/1.6)

2qb

(obtain from Figure NA.3)c (z)r

= c (z) r.m c (z) o b.

I (z), v.

p c (z))) o m.q = (1 + (3 /flat 2 0.613

(obtain from Figure NA.5)I (z),v flat

2

c alt )(

Y

!

"

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L?M;H5"!D !D0 ME)Q&-.1,+0)1+)K,.'*'*J+!H+0)1+(',%(+'*+,)Q*

b = (c dir c season c prob. . ) b, map

q = 0.613 bb2

N

Y NIs orography significant?

(see Figure NA.2)

c (z) from Annex A of ENoe = c (z) qbqp

.

(obtain from Figure NA.7;

obtain from Figure NA.8)

c (z)e

.c e,T

c e,T

z 50m? e = c (z)q p . ((c (z)o + 0.6)/1.6)2

qb

(obtain from Figure NA.3;

obtain from Figure NA.4)

c (z)r

= c (z) r.m c (z) o b. c r,T .

c r,T

I (z), v.

p c (z))) o m.q = (1 + (3 flat 2 0.613

(obtain from Figure NA.5; obtain

from Figure NA.6)

I (z),v flat

2

k I,T

ce,T.

. k I,T /

Y

c alt )(

!

"

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!Advisory note deleted"

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41

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