Roof Valley Framing Details

With a roll roofing valley keep the nails at least 6 inches from the valley centerline.

Roof valley framing details. Prescriptive roof consisting of the rafters a ridge board ceiling joists and collar ties. This type of roof is more complicated than the figure 2 1 most common types of pitched roofs. 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. Therefore the pitch of the valley rafter is 12 in 17.

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. 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. The rise or height of the roof at its peak is the altitude of the triangle.

With a metal liner nail 1 2 inch outside the liner. The function of each component is. 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.

The roof construction for mortarless valleys is similar to that for open grp valleys. And the line length measurement from the roof peak to the building wall is the hypotenuse. Trussed valley set detail no sheathing continuous 2x4 sp no 2 attached to the roof 146 basic 160 ultimate mph wind speed. 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 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 framing of a basic gable roof is based on a right angle triangle and the various roof framing components fit the triangle. Shingles should overlap the valley lining by at least 6 inches.