Roof Valley Framing Details

The roof construction for mortarless valleys is similar to that for open grp valleys.

Roof valley framing details.

Prescriptive roof consisting of the rafters a ridge board ceiling joists and collar ties. 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. 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. This type of roof is more complicated than the figure 2 1 most common types of pitched roofs.

The rafters carry the applied loads to the exterior walls. The framing of a basic gable roof is based on a right angle triangle and the various roof framing components fit the triangle. In a rafter roof all of these components are required to provide a stable roof. The valley is formed where the two different sections of the roof meet generally at a 90 angle.

Shingles should overlap the valley lining by at least 6 inches. Seal each shingle to the liner and overlapping shingle with a 3 inch wide bead of plastic roofing cement. And the line length measurement from the roof peak to the building wall is the hypotenuse. Therefore the pitch of the valley rafter is 12 in 17.

Trussed valley set detail no sheathing continuous 2x4 sp no 2 attached to the roof 146 basic 160 ultimate mph wind speed. With a metal liner nail 1 2 inch outside the liner. With a roll roofing valley keep the nails at least 6 inches from the valley centerline. The intersecting roof consists of a gable and valley or hip and valley.

The run or half the building span is the base of the triangle. 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. The rise or height of the roof at its peak is the altitude of the triangle.