Roof Valley Detail

A common misconception is that the mortar bedding is there to prevent water access.

Roof valley detail.

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. This article discusses details and specifications for roof valley flashing for best construction roof leak resistance. The valley area of a roof the straight lines formed when two different planes of the roof meet is a critical area that handles a tremendous amount of water run off. We describe how to construct three common styles of roof valley.

It is an area where water is directed towards rather than away from therefore correct detailing and construction is essential. 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. Open valley closed cut valley and woven roof valley and we include roof valley underlayment and nailing specifications. One of the areas of a pitched roof most prone to leakage if not constructed properly is the valley.

Woven closed cut and open. A roof valley is formed where two roof slopes meet. Riverside provides roof valley flashing for general contractors roofers and do it yourself home owners. Water collects in a valley to flow off the roof.

Trussed valley set detail no sheathing continuous 2x4 sp no 2 attached to the roof 146 basic 160 ultimate mph wind speed.