Roof Ledger Board Size

This tells you the size of the beam needed to support the porch s roof.

Roof ledger board size.

It is always better to have a large rafter rather than be concerned with a sagging roof. In the example d calculates to 7 75. If your local building authority has a rafter spacing code you may not space rafters wider than required by code. Typically you will need to install your bolts alternating high and low 2 from the top and bottom of the ledger board.

House rim joist must be minimum of 2x sawn lumber or 1 in. Calculate the initial value for d then round it up to the nearest inch. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. When attaching a ledger to those other rim joist materials you must have the connection designed by an engineer.

You want a flashing that won t react with. Lag screws may be spaced at 16. As a rule of thumb bolts can be spaced 16 on center for supporting joist span up to 12 in length. Ledger the same size as the rafters and fastened to the studs with x5 lag screws spaced page 2 of 6 at 32 maximum on center for up to a 10 0 rafter span.

The closer the rafters are to each other the stronger the roof will be. Douglas fir lvl no attachment is allowed to strand lumber syp lvl the mudsill i joists floor trusses or other materials. X 9 in. It should be 6 8 inches above grade ideally but you can get ground contact pt that can be placed closer.

2x6 p treated bolted as the size of your deck. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal.