Roof Valley Shingle Weave

There are two common methods for completing the flashing of a valley in a shingle roof system.

Roof valley shingle weave.

This is an incorrect installation of this type of roofing material and will be more prone to water intrusion and will void the manufacturer s warranty for this material. For a closed valley shingles are installed across the joint where planes intersect. All of the shingle rows will need to be lined up correctly. It is a method where the valley is completed by overlapping and weaving the shingle courses rather than cutting the shingles back to form a trough lined with a sheet metal flashing see figure wv 1.

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. But if the shingles are not laid properly in the valley a woven valley may not lay flat creating bumps and detracting from the overall look of the roof. One of the details that varies between homes is the method of flashing the valley areas of the roof. To understand what makes a valley either closed or open it is important to understand how a valley is constructed.

Here we have a laminated shingle roof that has been installed with a woven valley detail. Water has a small chance of even getting up under the woven valley shingles even though it flows in either direction. Weaving a shingle valley by dunn contracting 727 410 5717 james dunn. According to long time iko sales representative jeff tessaro closed valleys for residential construction have been popular since he was a roofing contractor in the late 90 s.

With each new course roofing shingles continue up the valley. Pros of woven valley shingle installations. Woven valleys should only be used with strip shingles. So if you are installing a woven valley you must push the shingles snugly into the valley while not nailing within six inches of the valley center.

A woven valley is one method of installation for asphalt shingles at a valley where two intersecting roof slopes meet see featured photo above. Some homeowners prefer the consistent look that a woven valley provides.