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Roof Pitch

The COP calculations are based on the plane area of the roof (which is the sloping surface area of the roof), not the plan area (which is the area covered by the roof).

 

Plane Area vs Plan Area

 

 

Wind action can influence effective catchment area, and the COP assumes the worst case scenario, i.e., rain striking the roof at an angle perpendicular to the roof plane.

 

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Clause Number: 
5.3.1.1
5.3.2.2
/cop/roof-drainage/roof-drainage-design#roof-pitch
Revision Category: 
1 - Minor Errata
Revision Detail: 

Minor layout fix. No changes to content or recommendations.

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