Roof Valley Flashing Types Open Closed Woven Difference
Roof Valley Flashing Types Open Closed Woven Difference The valley is where two roof planes meet and water from both planes converges into a single drainage path. It is the highest-velocity, highest-volume drainage point on most residential roofs, and it is the location where the roof fails first if the valley detail is wrong. The choice between open valley flashing, closed-cut valley flashing, and woven valley flashing is one of the more consequential decisions a roofer makes during installation, and it is one that most homeowners never learn enough about to evaluate intelligently. Each of the three valley types has a specific use case where it performs well and other situations where it performs poorly. The choice depends on the roof slope, the climate, the shingle product, the aesthetic the owner wants, and the manufacturer's warranty requirements for the shingle being installed. None of the three is universally correct. What Each Valley Type Actually Looks Like An o...
