Roof Valley Framing Details

The run or half the building span is the base of the triangle.

Roof valley framing details.

The rise or height of the roof at its peak is the altitude of the triangle. Not shown are the hip and valley rafters needed to tie the roof together where the rafters are framed at an angle to each other. This type of roof is more complicated than the figure 2 1 most common types of pitched roofs. The intersecting roof consists of a gable and valley or hip and valley.

Shingles should overlap the valley lining by at least 6 inches. The valley is formed where the two different sections of the roof meet generally at a 90 angle. The roof construction for mortarless valleys is similar to that for open grp valleys. 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.

The first cut that i make on both the common rafters and the valley rafter is the plumb cut where the rafter will meet the ridge board. The rafters carry the applied loads to the exterior walls. With a roll roofing valley keep the nails at least 6 inches from the valley centerline. In a rafter roof all of these components are required to provide a stable roof.

On the common rafters the plumb cut is marked with a framing square for a 12 in 12 pitch 45 and cut square i e no bevel. Therefore the pitch of the valley rafter is 12 in 17. And the line length measurement from the roof peak to the building wall is the hypotenuse. Instead of having an open channel like traditional valleys mortarless valleys have a central upstand and the tiling is finished close to the upstand on each side.

With a metal liner nail 1 2 inch outside the liner. The function of each component is. The framing of a basic gable roof is based on a right angle triangle and the various roof framing components fit the triangle.