Roof Valley Shingle Weave

Here we have a laminated shingle roof that has been installed with a woven valley detail.

Roof valley shingle weave.

The woven valley shingle installation method does not call for roofing cement relying instead on the weave pattern to protect from water infiltration. Some homeowners prefer the consistent look that a woven valley provides. For a closed valley shingles are installed across the joint where planes intersect. To understand what makes a valley either closed or open it is important to understand how a valley is constructed.

All of the shingle rows will need to be lined up correctly. One of the details that varies between homes is the method of flashing the valley areas of the roof. 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. There are two common methods for completing the flashing of a valley in a shingle roof system.

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. 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. Weaving a shingle valley by dunn contracting 727 410 5717 james dunn. Closed valleys or open valleys.

Woven valleys should only be used with strip shingles. To achieve a woven valley installation a roofing professional lays shingles in the valley and weaves them together. Water has a small chance of even getting up under the woven valley shingles even though it flows in either direction. 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.

A woven valley is one method of installation for asphalt shingles at a valley where two intersecting roof slopes meet see featured photo above. 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.