Over Valley Roof

There are two methods for sealing valleys.

Over valley roof.

Woven closed cut and open. All of the shingle rows will need to be lined up correctly. 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.

A roof valley is formed where two roof slopes meet. Stop nailing 6 inches from the center. 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.

Shingle the other side of the valley the same way. Water collects in a valley to flow off the roof. Valleys are created where two roof slopes meet. Fold the top over the roof ridge and cut the bottom along the drip edge metal.

Where two roof valleys meet for example above a gable dormer a soldered joint is likely to break from the movement. Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. Extend entire width of flashing completely to the bottom of the roof valley. 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.

Essentially there are three main ways to shingle a roof valley. Roof one side of the valley running the shingles across it. 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. With a clean valley you can lay down some peel and stick roofing membrane.

Roof valleys are troughs that discard runoff water where two sections of sloped roof meet. Lay one and two tab shingles as you near the valley so full size shingles will run across the 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. Open valleys and closed valleys.