Shingling a Valley-Woven Roof Northampton MA

Source: TOOLS OF THE TRADE Magazine
Publication date: November 2, 2005

By Section Editor: Mark Clement

There are lots of techniques for shingling a valley–woven, cut, open metal lined–but there's one you just won't find described on shingle wrappers that's easier and faster to install, is just as weather resistant, and looks great. It works with laminated or random-pattern shingles that comprise about 65 percent of the shingles installed. The system goes together like a cut valley, but since there's very little cutting required I call it a "no-cut valley." You may never cut a valley again.

A no-cut valley starts out just like an ordinary cut valley. Prepare the valley by lining it with waterproof shingle underlayment like Grace Ice and Water Shield for secondary water protection. Determine which roof plane drains the highest volume of water into the valley and which one drains the least. Shingle the lower-volume roof plane first in a standard fashion.

Step by Step

Step 1: Prep the Valley and Shingle the Low-Volume Roof Plane

Line the valley with waterproof shingle underlayment for secondary water protection (shown at the top of the photo above). Shingle the low-volume roof. Run the shingles through the valley center and at least 12 inches up onto the high-volume roof. Be sure to press the shingles tightly into the valley center to avoid bridging. It's best if there are no shingle joints within 12 inches of the valley.

Step 2: Snap a Guide Line...

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