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Design and Installation
To select the Guttering size appropriate to your requirements, two factors must be taken into consideration.
- Roof area
- Guttering Flow Capacity
For further reference refer to
BS EN 12056-3:2000 ‘Roof drainage, layout and calculation'.
Roof Area
The effective roof area can be calculated by using the following formula:
(B + C) x length of Roof =Area in M2
2
Guttering Flow Capacity
Guttering flow capacity is dependent upon system type, outlet position and whether Guttering is laid level or to a specified fall. The table above gives the required information based upon a Rainfall intensity of 75mm per hour and recommendations from BS EN 12056-3:2000.
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