Framing A Shed Roof With A Valley

Add the length of the overhang beyond this mark and.

Framing a shed roof with a valley.

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

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. Use a framing square to help lay out the notch based on the slope of the roof. That is except for the crowning glory the shed roof.

Position the square at the end of the rafter board with the tongue on your left and facing away from you. Measure form the top of this line down the board to determine the line length or length of the rafter less the ridge.