Roof Valley Construction Details

Open valley closed cut valley and woven roof valley and we include roof valley underlayment and nailing specifications.

Roof valley construction details.

In many cases with purchased house plans the details of the roof construction including rafter design are included. We describe how to construct three common styles of roof valley. Closed valleys or open valleys. These days cut ups or roofs with a lot of valleys dormers and other features are increasingly popular.

This article discusses details and specifications for roof valley flashing for best construction roof leak resistance. One of the details that varies between homes is the method of flashing the valley areas of the roof. Roof ridges and ridge tiles roof hips and hip tiles roof valleys roof verges and lead flashings. Another common design in the northeast is the saltbox which is a gable roof with one longer side.

To get the most out of it is helpful to also read parts 1 and 2. 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. Part 1 a guide to roof construction covers an overview of flat and pitched roofs.

Part 3 of the four part guide to roof construction covers pitched roof detail. It is therefore worth asking the valley manufacturer for guidance on this. Preformed grp valleys in many ways the roof construction for a pre formed grp valley is the same as that for a lead lined valley. Some grp valleys are sufficiently robust to enable them to be laid directly over the rafters rather than being supported on valley boards.

There are various techniques you ll need to know for each type of installation which we ll go over in detail. Woven closed cut and open.