Roof Valley Detail

A roof valley is formed where two roof slopes meet.

Roof valley detail.

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. A common misconception is that the mortar bedding is there to prevent water access. Riverside provides roof valley flashing for general contractors roofers and do it yourself home owners. This article discusses details and specifications for roof valley flashing for best construction roof leak resistance.

We describe how to construct three common styles of roof valley. 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. One of the areas of a pitched roof most prone to leakage if not constructed properly is the valley. 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.

Essentially there are three main ways to shingle a roof valley. Open valley closed cut valley and woven roof valley and we include roof valley underlayment and nailing specifications. It is an area where water is directed towards rather than away from therefore correct detailing and construction is essential. Woven closed cut and open.

Your choice of valley installation method is critical because when improperly installed valleys are risks for serious leaks.