Roof Valley Detail
Woven closed cut and open.
Roof valley detail. A roof valley is formed where two roof slopes meet. This article discusses details and specifications for roof valley flashing for best construction roof leak resistance. Valleys are typically found where gable dormer roofs meet the main roof or when a house has angled wings or additions where two roof sections in different planes meet. We describe how to construct three common styles of roof valley.
A common misconception is that the mortar bedding is there to prevent water access. Trussed valley set detail no sheathing continuous 2x4 sp no 2 attached to the roof 146 basic 160 ultimate mph wind speed. Water collects in a valley to flow off the roof. It is an area where water is directed towards rather than away from therefore correct detailing and construction is essential.
Open valley closed cut valley and woven roof valley and we include roof valley underlayment and nailing specifications. Valley flashings are custom fabricated to any measurements and angles and usually measure 10 in length but can also be we can also match any profile. Riverside provides roof valley flashing for general contractors roofers and do it yourself home owners. One of the areas of a pitched roof most prone to leakage if not constructed properly is the valley.
Your choice of valley installation method is critical because when improperly installed valleys are risks for serious leaks.