Rafters On A Sloped Roof

The top of the ridge beam m y.

Rafters on a sloped roof.

They also make sheathing and adding roofing material a bit more difficult due to the added angles on your roof. To determine the y height measure from the bird s mouth up the calculated slope x in 12 to the top of the rafter. The ridge end of the rafter and often the eve end will need to be cut to the angle of the roof slope. This is our ultimate roof rafter guide for people designing and building an off grid cabin or tiny home.

Also known as a king common the king rafter is the center rafter between two hip rafters. The first step in building the roof rafters is to cut one rafter board to length with the ends angled properly and then to mark and cut the birds mouth and seat on the rafter. If you have a single sloped shed roof then using 2 6 rafters is a better bet because the price differential won t be huge and your shed roof will have a much greater load capacity. These rafters require extra measurement to mesh the hip gable to the ridge beam properly.

As a general rule roofs that have a high human occupancy rate should be framed with rafters every 16 structures such as sheds or barns can be frames with rafters every 24 again make sure to consult local codes. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. Below we ll take a closer look at when to use 2 4 and 2 6 lumber for your shed roof and hopefully you ll be able to make a more informed decision on what type of lumber you should use when building your shed roof rafters.