Over Valley Roof

There are two methods for sealing valleys.

Over valley roof.

The valleys on many older houses comprise layers of roofing paper which can deteriorate over time. Roof one side of the valley running the shingles across it. 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.

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. Water collects in a valley to flow off the roof. Pros of woven valley shingle installations. A roof valley is formed where two roof slopes meet.

Stop nailing 6 inches from the center. Essentially there are three main ways to shingle a roof valley. With a clean valley you can lay down some peel and stick roofing membrane. 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.

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. All of the shingle rows will need to be lined up correctly. Your choice of valley installation method is critical because when improperly installed valleys are risks for serious leaks. 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.

Shingle the other side of the valley the same way. Valleys are created where two roof slopes meet. Extend entire width of flashing completely to the bottom of the roof valley. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley.

Open valleys and closed valleys. Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. Woven closed cut and open. Where two roof valleys meet for example above a gable dormer a soldered joint is likely to break from the movement.