Over Valley Roof

Valleys are created where two roof slopes meet.

Over valley roof.

Overlap metal roof valley sections by 12 inches and seal the lap with a flexible sealant such as polyurethane or butyl on roofs shallower than 5 12. With a clean valley you can lay down some peel and stick roofing membrane. Find out the differences before you talk to a roofing expert. Your choice of valley installation method is critical because when improperly installed valleys are risks for serious leaks.

Fold the top over the roof ridge and cut the bottom along the drip edge metal. Woven closed cut and open. Stop nailing 6 inches from the center. All of the shingle rows will need to be lined up correctly.

Cut bottom of flashing so the entire width of the valley flashing extends approximately 1 2 to 3 4 over the fascia trim board along eaves the following photos illustrate removal and replacement of a closed cut valley with new open metal valley. Essentially there are three main ways to shingle a roof valley. A roof valley is formed where two roof slopes meet. The valleys on many older houses comprise layers of roofing paper which can deteriorate over time.

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. Extend entire width of flashing completely to the bottom of the roof valley. Roof one side of the valley running the shingles across it. Because of the sheer amount of water being navigated through this section your valleys need to be properly sealed.

Open valleys and closed valleys. There are two methods for sealing valleys. Roof valleys are troughs that discard runoff water where two sections of sloped roof meet. Where two roof valleys meet for example above a gable dormer a soldered joint is likely to break from the movement.

On jul 10 2010 a woven valley shingle installation is one where the shingles from both sides of the roof valley extend over the valley and weave together overlapping courses alternately. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley. Pros of woven valley shingle installations. 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.