Roof Valley Framing Details

Valleys are typically found where gable dormer roofs meet the main roof or when a house has angled wings or additions where two roof sections in different planes meet.

Roof valley framing details. Framing a complex roof is one of the trickiest parts of home building. Woven closed cut and open. Sheathing blocking is added along the valley and the sheathing pieced in for both roof planes. Water collects in a valley to flow off the roof.

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. The valley area of a roof the straight lines formed when two different planes of the roof meet is a critical area that handles a tremendous amount of water run off. To transition the eaves the horizontal fascia extends to the last rafter tail and a vertical return finishes the transition. Another common design in the northeast is the saltbox which is a gable roof with one longer side.

Essentially there are three main ways to shingle a roof valley. This roof valley is a perfect example. Prescriptive roof consisting of the rafters a ridge board ceiling joists and collar ties. The rafters carry the applied loads to the exterior walls.

If you begin with accurate as built measurements and use a construction calculator to do the math you can cut all of the rafters for most roofs on the ground in just one shot. Your choice of valley installation method is critical because when improperly installed valleys are risks for serious leaks. 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. Trussed valley set detail no sheathing continuous 2x4 sp no 2 attached to the roof 146 basic 160 ultimate mph wind speed.

But it doesn t have to be. Shed gable hip gambrel and mansard. A roof valley is formed where two roof slopes meet. Roof framing is one of those carpenter skills that appears quite complicated and indeed some roof designs are difficult.

The valley is formed where the two different sections of the roof meet generally at a 90 angle. In a rafter roof all of these components are required to provide a stable roof. The function of each component is. This type of roof is more complicated than the figure 2 1 most common types of pitched roofs.

Roofs are basically five types.