How To Sheath A Roof Valley

As you install roof shingles on the second roof plane you allow them to lap over the valley on top of the first shingles.

How to sheath a roof valley.

Plywood sheathing angle cut to slope a difficult cut to determine is the angle of plywood sheathing where it intersects into a valley. 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. Ll factor 12. Begin applying the sheets from the bottom of the roof the eaves and work your way up to the ridge.

The sheathing along the valley doesn t have blocking for continuous nailing and i d rather not nail sheathing to sheathing. Find the common line length factor ratio. I ve got this 7 12 roof to work with and going into the valley i measured the long and short points. The roof includes a bumpout with a smaller gable roof that intersects the main roof forming two valleys.

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. We go in depth on how to install roof sheathing. A valley set will be installed on top of the main roof sheathing.

Starting with how to place the first row of sheathing we cover fastening methods the use of h clips stagg. The last course at the top may need to be rip cut if the roof is not in 4 foot increments.