How To Sheath A Roof Valley

The last course at the top may need to be rip cut if the roof is not in 4 foot increments.

How to sheath a roof valley.

The sheathing along the valley doesn t have blocking for continuous nailing and i d rather not nail sheathing to sheathing. It worked ok but it wasn t perfect. I ve got this 7 12 roof to work with and going into the valley i measured the long and short points. We go in depth on how to install roof sheathing.

A valley set will be installed on top of the main roof sheathing. As you install roof shingles on the second roof plane you allow them to lap over the valley on top of the first shingles. The following 2 formulas will give the inches to subtract off the lower square edge so plywood will match the valley rafter angle. The shingles on the second layer are then cut ideally creating a clean line down the center of the valley.

Plywood sheathing angle cut to slope a difficult cut to determine is the angle of plywood sheathing where it intersects into a valley. The roof includes a bumpout with a smaller gable roof that intersects the main roof forming two valleys. Begin applying the sheets from the bottom of the roof the eaves and work your way up to the ridge. Starting with how to place the first row of sheathing we cover fastening methods the use of h clips stagg.

It is important here that the sheathing at the eave line be exactly perpendicular to the rafters so that the sheets will meet at the centers of the rafters. Find the common line length factor ratio.