Framing Intersecting Roof Lines

Explore framing complexities that result when roofs of two different pitches intersect.

Framing intersecting roof lines.

Lay your square in the corner of the plywood drawing working from the side of the diagonal line that represents the main roof. Rafter forms a depression in the roof instead of a hip. 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. A sketchup model helps clarify how various rafters and framing components are assembled in an off angle hip and valley configuration.

Sheathing blocking is added along the valley and the sheathing pieced in for both roof planes. Intersecting the intersecting roof consists of a gable and valley or hip and valley. It extends from one gable end to the other at the peak of the roof. Position the square at the end of the rafter board with the tongue on your left and facing away from you.

Add the length of the overhang beyond this mark and. In a standard gable roof the ridge. To transition the eaves the horizontal fascia extends to the last rafter tail and a vertical return finishes the transition. Learn more about off angle roof framing.

This type of roof is more complicated than the figure 2 1 most common types of pitched roofs. Like the hip rafter it extends diago nally from the top plate to the ridge. Measure form the top of this line down the board to determine the line length or length of the rafter less the ridge. At the low end of the valley the subfascias of the two roofs are mitered with a block filling in the roof framing.

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. A jack rafter is a shortened com mon rafter that may be framed to a hip.