Framing Intersecting Roof Lines

At the low end of the valley the subfascias of the two roofs are mitered with a block filling in the roof framing.

Framing intersecting roof lines.

Position the square at the end of the rafter board with the tongue on your left and facing away from you. Rafter forms a depression in the roof instead of a hip. The valley is formed where the two different sections of the roof meet generally at a 90 angle. Keeping the outside edge of the blade flush with the edge of the plywood slide the square until the 12 inch mark on the tongue intersects with the hip.

The ridge board is the horizontal framing member that defines the roofline in a gable roof. Add the length of the overhang beyond this mark and. Measure form the top of this line down the board to determine the line length or length of the rafter less the ridge. A sketchup model helps clarify how various rafters and framing components are assembled in an off angle hip and valley configuration.

A hip rafter is called for only when framing a hip roof but a valley rafter is needed on both hip and gable roofs whenever roof planes intersect. To transition the eaves the horizontal fascia extends to the last rafter tail and a vertical return finishes the transition. Lay your square in the corner of the plywood drawing working from the side of the diagonal line that represents the main roof. In a standard gable roof the ridge.

Like the hip rafter it extends diago nally from the top plate to the ridge. Explore framing complexities that result when roofs of two different pitches intersect. Sheathing blocking is added along the valley and the sheathing pieced in for both roof planes. Learn more about off angle roof framing.

It extends from one gable end to the other at the peak of the roof. This type of roof is more complicated than the figure 2 1 most common types of pitched roofs.