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Changing Angles in Valleys

A change of roof pitch in a valley run will usually result in the change of angle in plan view. The change is acceptable, but the freeboard of the lower valley must be at least 20 mm to allow for turbulence.

/cop/roof-drainage/types-gutter#changing-angles-valleys
Revision Category: 
4 - Clause Inserted
Revision Detail: 

New clause.