Effective Roof Area, (A) - Revision history

Joceil.infante at 07:43, 25 May 2017

2017-05-25T07:43:14Z

Joceil.infante at 07:42, 25 May 2017

2017-05-25T07:42:00Z

Joceil.infante at 07:40, 25 May 2017

2017-05-25T07:40:15Z

Joceil.infante at 05:04, 25 May 2017

2017-05-25T05:04:12Z

Joceil.infante: Created page with "According to BS EN 12056-3, it is the surface area of roof where in with/ without wind driven rain is considered. == Wind driven rain == '''Without''' Where no allowance..."

2017-05-25T04:20:00Z

Created page with "*According to BS EN 12056-3, it is the surface area of roof where in with/ without wind driven rain is considered. == Wind driven rain == *'''Without''' Where no allowance..."

New page

*According to BS EN 12056-3, it is the surface area of roof where in with/ without wind driven rain is considered.

== Wind driven rain ==
*'''Without'''

Where no allowance is made for wind, the Effective Roof Area (A) shall be calculated from the equation;
"A=" L_"R" ×B_"R"
where
A is the effective roof area, in square metres ("m" ^2 );
L_"R" is the length of roof to be drained, in metres (m);
B_"R" is the width of roof from gutter to ridge, in metres (m).

*'''With'''

Where allowance is made for wind, the effective roof area shall be calculated as follows;

← Older revision		Revision as of 07:43, 25 May 2017
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	In areas where wind is taken into account in rainfall calculations, where rain driven against a wall by the wind can run down onto the roof or into a gutter, 50% of the area of the wall shall be added to the effective area of the roof.		In areas where wind is taken into account in rainfall calculations, where rain driven against a wall by the wind can run down onto the roof or into a gutter, 50% of the area of the wall shall be added to the effective area of the roof.

		+	[[File:Roof dimension.jpeg]]

−	~~[[File~~:~~Roof dimension.jpeg]]~~	+
		+	== References ==
		+	#BS EN 12056-3:2000 Gravity drainage systems inside buildings

← Older revision		Revision as of 07:42, 25 May 2017
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−	~~== Roof dimension ==~~
	[[File:Roof dimension.jpeg]]		[[File:Roof dimension.jpeg]]
−	~~Roof dimension~~

@@ Line 18: / Line 18: @@
 == With Wind driven rain ==
 Where allowance is made for wind, the effective roof area shall be calculated as follows;
@@ Line 33: / Line 32: @@
 |<math>A = L_R \sdot T_R</math>
 |-
-|colspan="2"|'''NOTES:'''
+|colspan="2"|'''NOTES:'''<br /><math>L_R</math> is the length of roof to be drained, in metres <math>(m)</math>;<br /><math>B_R</math> is the plan width of roof from gutter to ridge, in metre <math>(m)</math>;<br /><math>H_R</math> is the height of roof from gutter to ridge, in metres <math>(m)</math>;<br /><math>T_R</math> is the distance from gutter to ridge measured along the roof, in metres <math>(m)</math><br /><math>A</math> is the effective impermeable roof area, in square metres <math>(m^2)</math>.
-|-
-|colspan="2"|<math>L_R</math> is the length of roof to be drained, in metres (m);
+In areas where wind is taken into account in rainfall calculations, where rain driven against a wall by the wind can run down onto the roof or into a gutter, 50% of the area of the wall shall be added to the effective area of the roof.
 <br /><math>B_R</math> is the plan width of roof from gutter to ridge, in metre (m);