Lacing A Valley On A Roof

There are three common valley details.

Lacing a valley on a roof.

I then move the shingle to the uppermost course on the roof plane line up the mark on the shingle with the valley center and again mark the corner. To shingle out of the valley with laminated shingles lay a shingle down as a gauge and mark the corner at the bottom left and top right of the roof. Shingle the other side of the valley the same way. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley.

A properly flashed roof valley should have an ice and water shield installed with roofing felt being properly secured over the ice and water. If the ice and water shield is missing then you will have to remove the shingles on both sides along the valley put ice and water shield in place and re shingle the roof. Roof one side of the valley running the shingles across it. There are various techniques you ll need to know for each type of installation which we ll go over in detail.

Woven open and closed cut. Woven closed cut and open. Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. When deciding how to shingle a roof valley you will need to consider your materials the climate and the desired look of the roof.

Essentially there are three main ways to shingle a roof valley.