It is an area where water is directed towards rather than away from therefore correct detailing and construction is essential.
Roof valley detail.
A roof valley is formed where two roof slopes meet.
A common misconception is that the mortar bedding is there to prevent water access.
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.
Trussed valley set detail no sheathing continuous 2x4 sp no 2 attached to the roof 146 basic 160 ultimate mph wind speed.
Essentially there are three main ways to shingle a roof valley.
Woven closed cut and open.
Water collects in a valley to flow off the roof.
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.
One of the areas of a pitched roof most prone to leakage if not constructed properly is the valley.
This article discusses details and specifications for roof valley flashing for best construction roof leak resistance.
Riverside provides roof valley flashing for general contractors roofers and do it yourself home owners.
Your choice of valley installation method is critical because when improperly installed valleys are risks for serious leaks.
Special pricing available for large quantities.