In order to build rafters you need to know the roof pitch and the roof span overall width of roof.
How to cut roof rafters.
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While it isn t that difficult to build rafters the wall system supporting the roof must be level and square.
Use it to make the proper measurements marks and cuts on each rafter.
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.
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.
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.
Creating a birdsmouth cut is the classic way to prepare a rafter for a hand cut gable or shed roof.
Plumb cut typically called the ridge cut at the top end of the rafter.
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.
The ridge end of the rafter and often the eve end will need to be cut to the angle of the roof slope.
Use the template you completed in step iii to map out the rest of the rafters you ll need for the entire roof.
Tail cut which may be cut plumb or square depending on how the eaves are detailed.
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.
