Next, plan out your lean to shed roof rafter spacing and position the rafters in place. Make your birdsmouth cuts on the front and back of the rafter which will allow the rafter to sit flat upon the shed wall’s top plates. To build a lean to shed roof, start by determining the length of your roof rafters and the desired overhang at the front, back, and sides of the shed.
Learning how to build a lean to shed roof is very simple overall – but the birdsmouth cut (described herein) can make lean to shed roof framing seem intimidating to some. A lean to style shed roof is one of the simplest and most durable shed roof options available.