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Asymmetrical Valleys

Where opposing roofs of different pitches discharge into a valley an asymmetrical valley is required. They may be designed so the side under the flatter roof is at the same height as the steeper side and 20 mm freeboard is required

/cop/roof-drainage/types-gutter#asymmetrical-valleys
Revision Category: 
1 - Minor Errata
Revision Detail: 

Punctuation fix.