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.

Add the length of the overhang beyond this mark and. The valley rafter is marked for a 12 in 17 pitch and then cut with a double bevel to fit into the ridge intersection. At the low end of the valley the subfascias of the two roofs are mitered with a block filling in the roof framing. That is except for the crowning glory the shed roof.

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. In truth framing in the foundation and the walls adding doors and windows these are all relatively straightforward simple tasks. For many people the idea of having to do the shed roof framing is a little bit on the scary side. Sheathing blocking is added along the valley and the sheathing pieced in for both roof planes.

Measure form the top of this line down the board to determine the line length or length of the rafter less the ridge. A 2 4 wall with a 2 6 rafter can be notched for a 4 seat.