Roof Valley Construction Details

Part 1 a guide to roof construction covers an overview of flat and pitched roofs.

Roof valley construction details.

Closed valleys or open valleys. Part 3 of the four part guide to roof construction covers pitched roof detail. To understand what makes a valley either closed or open it is important to understand how a valley is constructed. There are various techniques you ll need to know for each type of installation which we ll go over in detail.

One of the details that varies between homes is the method of flashing the valley areas of the roof. 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. Woven closed cut and open.

When deciding how to shingle a roof valley you will need to consider your materials the climate and the desired look of the roof. 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. There are two common methods for completing the flashing of a valley in a shingle roof system. Cad details document name pdf dwg download all cad construction details 37 1 mb 3 4 mb mc01 identification of roof areas 694 kb 167 kb mc01a single layer underlayment 678 kb 302 kb mc01b double layer underlayment 711 kb 322 kb mc02 vent pipe flashing 626 kb 349 kb mc03 valley.

Essentially there are three main ways to shingle a roof valley. It is therefore worth asking the valley manufacturer for guidance on this. Roof ridges and ridge tiles roof hips and hip tiles roof valleys roof verges and lead flashings. These days cut ups or roofs with a lot of valleys dormers and other features are increasingly popular.

Some grp valleys are sufficiently robust to enable them to be laid directly over the rafters rather than being supported on valley boards. We describe how to construct three common styles of roof valley.