Porch Rafter Roof Framing

Typical rafter spacing codes will specify a minimum spacing of 16 inches 19 2 inches or 24 inches.

Porch rafter roof framing.

All wood to be 2 douglas fir or better. Building a porch roof requires basic carpentry and porch roof framing knowledge. We show you how both a typical rafter style porch and truss roof area constructed. Rafter layout with a framing square.

The roof rafters provide integral structural support to the roof. Since building a porch roof requires accurate measurements you ll need a rafter square to lay out the cuts on the boards. We show you the steps involved and calculations required for buildng a roof for your porch or constructing one over your deck or patio. 12ft 2 sq x 1 d 4x8 10ft 2x8 24 o c.

Before you cut your boards you ll need to measure the width of your building and calculate the exact length of each rafter. Position the square at the end of the rafter board with the tongue on your left and facing away from you. Consult local building codes for snow load capacity and reference the span tables for joists and rafters published by the american wood council awc 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. Position the square with both the 8 inch on the outside edge of the tongue and the 12 inch on the blade on the upper edge of the board.

The porch roof may match the pitch of your home or have a more shallow roof pitch. Porch depth footing size beam size max beam span rafter size post size 10ft 18 sq x 1 d 4x8 10ft 2x6 24 o c. Joist hangers can help you mount each rafter to the house. Rise and run is critical to building a porch roof cutting rafters and even figuring out the amount of shingles to purchase.

Rise and run affects drainage style and installation repair and even what roofing materials you can use. If you decide on a shallow pitch porch roof use 2 by 6 foot rafters. Before installing the rafters make the proper cuts. The positioning of your rafters will depend on the pitch of the porch roof.

If your local building authority has a rafter spacing code you may not space rafters wider than required by code. If you re framing a gable roof on a new house or building a shed or even a doghouse with a gable roof you ll need to cut a number of roof rafters. Rafters must be strong enough to hold the roof sheathing and the shingles. Use screws to secure the rafter to the sill plate.