Framing A Shed Roof With A Valley

Use a framing square to help lay out the notch based on the slope of the roof.

Framing a shed roof with a valley. For many people the idea of having to do the shed roof framing is a little bit on the scary side. Measure form the top of this line down the board to determine the line length or length of the rafter less the ridge. That is except for the crowning glory the shed roof. Sheathing blocking is added along the valley and the sheathing pieced in for both roof planes.

In truth framing in the foundation and the walls adding doors and windows these are all relatively straightforward simple tasks. On the common rafters the plumb cut is marked with a framing square for a 12 in 12 pitch 45 and cut square i e no bevel. To transition the eaves the horizontal fascia extends to the last rafter tail and a vertical return finishes the transition. Position the square at the end of the rafter board with the tongue on your left and facing away from you.

The valley rafter is marked for a 12 in 17 pitch and then cut with a double bevel to fit into the ridge intersection. For our 4 x8 lean to example using a 2 4 rafter the depth of the birdsmouth is limited by the 1 3 depth of the rafter rule.