How To Roof A Closed Valley

Closed valleys or open valleys.

How to roof a closed valley.

I begin the second side. Because of the sheer amount of water being navigated through this section your valleys need to be properly sealed. Plus cutting the closed cut valley shingles can happen after the rest of the roof is shingled. There are two common methods for completing the flashing of a valley in a shingle roof system.

Valleys are created where two roof slopes meet. One layer of shingles actually crosses the valley beneath the other. Closed cut shingle valley installation. One of the details that varies between homes is the method of flashing the valley areas of the roof.

Shingles from the other side are run through the valley center line and cut along a line parallel to and 4 cm from the center line. To understand what makes a valley either closed or open it is important to understand how a valley is constructed. With a closed cut valley there s no need to shingle the two roof planes at the same time. Usually there s a self adhering ice and water shield or a second underlayment installed that covers the other parts of the roof that the initial underlayment can t cover.

There are two methods for sealing valleys. The closed variation is a flashing that has been completely covered with shingles while in the open variation will have the flashing completely exposed to the elements. For closed cut valleys shingles on one roof plane are installed through a valley and extended at least 30 cm into the intersecting plane. From the ground it looks as though the shingles meet in a clean line in the center of the valley.

Prior to installation the underlayment is installed over the entire roof deck. Closed cut valley even if i work toward the valley with three tab shingles cut valleys are faster than woven valleys hands down. Find out the differences before you talk to a roofing expert.