How To Cut Porch Roof Rafters

When you cut the rafters you ll need to make 3 separate cuts.

How to cut porch roof rafters. 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. Then force the rafter s tip snugly against the house wall. Before you cut your boards you ll need to measure the width of your building and calculate the exact length of each rafter. Using a block of wood as a ruler mark the ends for cutting.

Tail cut which may be cut plumb or square depending on how the eaves are detailed. A common rafter has three basic parts you need to become familiar with. Not quite done yet though. This is the easy way to figure the angle to cut a porch roof rafter.

The run is 96 x 12 65 length factor for a 4 12 roof 1214 4 divided by 12 101 2 inches. Add the overhang space the same way. To find the length of your rafters multiply the run in inches by the rafter length factor and divide by 12. First you must know the pitch of the main roof and the porch or shed roof.

Usually it can be found on the plans when building a new home. The roof rafters provide integral structural support to the roof. Http amzn to 2sfscbz swanson speed square http amzn to 2svgnvt 16 x 24 framing square starrett http amzn to 2sflm5v milwaukee circular saw http amzn. The ridge cut also called the plumb cut at the top of the rafter the birdsmouth cut which itself comprises 2 different cuts where the rafter meets the building s wall and the tail cut at the base of the rafter.

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.