Roof Valley Framing Details

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.

Roof valley framing details.

Framing a complex roof is one of the trickiest parts of home building. 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. Trussed valley set detail no sheathing continuous 2x4 sp no 2 attached to the roof 146 basic 160 ultimate mph wind speed. Essentially there are three main ways to shingle a roof valley.

The intersecting roof consists of a gable and valley or hip and valley. Roof framing is one of those carpenter skills that appears quite complicated and indeed some roof designs are difficult. To transition the eaves the horizontal fascia extends to the last rafter tail and a vertical return finishes the transition. Prescriptive roof consisting of the rafters a ridge board ceiling joists and collar ties.

Another common design in the northeast is the saltbox which is a gable roof with one longer side. Shed gable hip gambrel and mansard. 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. A roof valley is formed where two roof slopes meet.

This roof valley is a perfect example. Sheathing blocking is added along the valley and the sheathing pieced in for both roof planes. In a rafter roof all of these components are required to provide a stable roof. Roofs are basically five types.

The valley is formed where the two different sections of the roof meet generally at a 90 angle. This type of roof is more complicated than the figure 2 1 most common types of pitched roofs. Details for conventional wood frame construction the first approach to achieving a strong durable struc ture involving economical use of materials is to follow a. Water collects in a valley to flow off the roof.

The function of each component is. 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. At the low end of the valley the subfascias of the two roofs are mitered with a block filling in the roof framing. Your choice of valley installation method is critical because when improperly installed valleys are risks for serious leaks.

But it doesn t have to be.