Roof Valley Construction Details

These days cut ups or roofs with a lot of valleys dormers and other features are increasingly popular.

Roof valley construction details.

Some grp valleys are sufficiently robust to enable them to be laid directly over the rafters rather than being supported on valley boards. Another common design in the northeast is the saltbox which is a gable roof with one longer side. 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 various techniques you ll need to know for each type of installation which we ll go over in detail.

In many cases with purchased house plans the details of the roof construction including rafter design are included. Open valley closed cut valley and woven roof valley and we include roof valley underlayment and nailing specifications. There are two common methods for completing the flashing of a valley in a shingle roof system. Part 3 of the four part guide to roof construction covers pitched roof detail.

Roof ridges and ridge tiles roof hips and hip tiles roof valleys roof verges and lead flashings. 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. It is therefore worth asking the valley manufacturer for guidance on this. Essentially there are three main ways to shingle a roof valley.

One of the details that varies between homes is the method of flashing the valley areas of the roof. 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. Part 1 a guide to roof construction covers an overview of flat and pitched roofs.

To understand what makes a valley either closed or open it is important to understand how a valley is constructed. We describe how to construct three common styles of roof valley.