How To Cut Porch Roof Rafters

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How to cut porch roof rafters.

The roof rafters provide integral structural support to the roof. To cut sloping rafters for a house attached patio roof lay a rafter board so it rests on its edge on both the ledger and the beam parallel to the ledger. Birdsmouth which consists of two cuts a horizontal seat cut and a vertical shoulder cut. When you cut the rafters you ll need to make 3 separate cuts.

First you must know the pitch of the main roof and the porch or shed roof. Before you cut your boards you ll need to measure the width of your building and calculate the exact length of each rafter. Rick arnold frequent contributor to fine homebuilding and the journal of light construction presenter at jlc live the katz roadshow the remodeling show. A common rafter has three basic parts you need to become familiar with.

Then force the rafter s tip snugly against the house wall. Using a block of wood as a ruler mark the ends for cutting. Plumb cut typically called the ridge cut at the top end of the rafter. Usually it can be found on the plans when building a new home.

Add the overhang space the same way. This is the easy way to figure the angle to cut a porch roof rafter. Here s a simple formula to help figure out the angle cut at the top of a shed roof when it lies on the main roof. The run is 96 x 12 65 length factor for a 4 12 roof 1214 4 divided by 12 101 2 inches.

Not quite done yet though.