Valley Roof Framing Details

The intersecting roof consists of a gable and valley or hip and valley.

Valley roof framing details.

Similarly hip and valley rafters provide the point of connection for roof rafters framed at angles. Another common design in the northeast is the saltbox which is a gable roof with one longer side. Open valley closed cut valley and woven roof valley and we include roof valley underlayment and nailing specifications. We describe how to construct three common styles of roof valley.

However since there is some load transfer with these members the code requires a nominal 2 thickness and bracing to a load bearing partition at the upper end or to be designed as a beam with proper supports. 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. This roof valley is a perfect example.

This type of roof is more complicated than the figure 2 1 most common types of pitched roofs. Framing a complex roof is one of the trickiest parts of home building. Roof framing is one of those carpenter skills that appears quite complicated and indeed some roof designs are difficult. Essentially there are three main ways to shingle a roof valley.

Woven closed cut and open. Trussed valley set detail no sheathing continuous 2x4 sp no 2 attached to the roof 146 basic 160 ultimate mph wind speed. 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. Water collects in a valley to flow off the roof.

A roof valley is formed where two roof slopes meet. 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. But it doesn t have to be. 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.

The valley is formed where the two different sections of the roof meet generally at a 90 angle.