Framing Intersecting Roof Lines

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.

Framing intersecting roof lines.

The valley is formed where the two different sections of the roof meet generally at a 90 angle. Measure form the top of this line down the board to determine the line length or length of the rafter less the ridge. Like the hip rafter it extends diago nally from the top plate to the ridge. Position the square at the end of the rafter board with the tongue on your left and facing away from you.

To transition the eaves the horizontal fascia extends to the last rafter tail and a vertical return finishes the transition. In a standard gable roof the ridge. Is that it is more difficult to construct than a gable roof. Rafter forms a depression in the roof instead of a hip.

At the low end of the valley the subfascias of the two roofs are mitered with a block filling in the roof framing. Intersecting the intersecting roof consists of a gable and valley or hip and valley. 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. This type of roof is more complicated than the figure 2 1 most common types of pitched roofs.

Add the length of the overhang beyond this mark and. A sketchup model helps clarify how various rafters and framing components are assembled in an off angle hip and valley configuration. Explore framing complexities that result when roofs of two different pitches intersect. Lay your square in the corner of the plywood drawing working from the side of the diagonal line that represents the main roof.

Learn more about off angle roof framing. Sheathing blocking is added along the valley and the sheathing pieced in for both roof planes.