Over Valley Roof

Lay one and two tab shingles as you near the valley so full size shingles will run across the valley.

Over valley roof.

Find out the differences before you talk to a roofing expert. Fold the top over the roof ridge and cut the bottom along the drip edge metal. 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. Shingle the other side of the valley the same way.

Water collects in a valley to flow off the roof. Pros of woven valley shingle installations. Open valleys and closed valleys. Your choice of valley installation method is critical because when improperly installed valleys are risks for serious leaks.

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. Roof valleys are troughs that discard runoff water where two sections of sloped roof meet. Valleys are created where two roof slopes meet. 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.

Extend entire width of flashing completely to the bottom of the roof valley. Woven closed cut and open. Essentially there are three main ways to shingle a roof valley. 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.

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. A roof valley is formed where two roof slopes meet. All of the shingle rows will need to be lined up correctly. Roof one side of the valley running the shingles across it.

Stop nailing 6 inches from the center. Because of the sheer amount of water being navigated through this section your valleys need to be properly sealed. There are two methods for sealing valleys. The valleys on many older houses comprise layers of roofing paper which can deteriorate over time.