Roof Valley Weave

A closed cut asphalt shingle roof valley starts the same way as a woven valley with the first course of shingles run across the valley from both roof planes lapping the shingle from the larger or steeper roof plane over the shingle from the smaller shallower plane.

Roof valley weave.

Pros of woven valley shingle installations. Stop nailing 6 inches from the center. Woven valleys should only be used with strip shingles. Roof one side of the valley running the shingles across it.

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. A woven valley is one method of installation for asphalt shingles at a valley where two intersecting roof slopes meet see featured photo above. But if the shingles are not laid in the valley properly a woven valley may not lay flat creating bumps and detracting from the overall look of the roof. 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.

To achieve a woven valley installation a roofing professional lays shingles in the valley and weaves them together. 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. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley.

Shingling both a closed cut valley and a long island valley is the same for the first half of the process. Some homeowners prefer the consistent look that a woven valley provides. For the next two shingling methods closed cut and long island valleys i work out of the valley using laminated shingles instead of working toward the valley with three tab shingles. 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.