Over Valley Roof

Woven closed cut and open.

Over valley roof.

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. Open valleys and closed valleys. A roof valley is formed where two roof slopes meet. Roof one side of the valley running the shingles across it.

Valleys are created where two roof slopes meet. Your choice of valley installation method is critical because when improperly installed valleys are risks for serious leaks. With a clean valley you can lay down some peel and stick roofing membrane. 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. Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. Because of the sheer amount of water being navigated through this section your valleys need to be properly sealed. 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.

All of the shingle rows will need to be lined up correctly. Stop nailing 6 inches from the center. Where two roof valleys meet for example above a gable dormer a soldered joint is likely to break from the movement. 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.

Essentially there are three main ways to shingle a roof valley. There are two methods for sealing valleys. Roof valleys are troughs that discard runoff water where two sections of sloped roof meet. Water collects in a valley to flow off the roof.

The valleys on many older houses comprise layers of roofing paper which can deteriorate over time. Extend entire width of flashing completely to the bottom of the roof valley. Find out the differences before you talk to a roofing expert. Shingle the other side of the valley the same way.