How To Cut Roof Rafters

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How to cut roof rafters.

Birdsmouth which consists of two cuts a horizontal seat cut and a vertical shoulder cut. A common rafter has three basic parts you need to become familiar with. Creating a birdsmouth cut is the classic way to prepare a rafter for a hand cut gable or shed roof. Once you ve marked all of your rafters you can complete all of the cuts in each rafter one after the other which will help you to save time.

Cutting the remaining rafters. Mark and cut the first rafter ends 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. The plumb cut at the top of the rafter and the seat or heel cut at the bottom have a 90 degree relationship to each other. While it isn t that difficult to build rafters the wall system supporting the roof must be level and square.

Because a roof requires many rafters to frame it speeds things along if you use the first rafter as a pattern or template for the other rafters. Plumb cut typically called the ridge cut at the top end of the rafter. Before you start cutting you first need to determine how long your roof rafters need to be and the angles at which you ll cut the top and bottom 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.

Use it to make the proper measurements marks and cuts on each rafter. Use the template you completed in step iii to map out the rest of the rafters you ll need for the entire roof. Measure as precisely as possible down to the 1 4 inch 0 64 cm 1 8 inch 0 32 cm or 1 16 inch 0 16 cm.