Roof Ledger Board Size

Douglas fir lvl no attachment is allowed to strand lumber syp lvl the mudsill i joists floor trusses or other materials.

Roof ledger board size.

House rim joist must be minimum of 2x sawn lumber or 1 in. Our roof rafter calculator tools are handy for calculating the number of rafters needed rafter length calculator lineal feet of rafter board feed in ridge and sub facia and the total board feet in the roof. It is always better to have a large rafter rather than be concerned with a sagging roof. It should be 6 8 inches above grade ideally but you can get ground contact pt that can be placed closer.

When attaching a ledger to those other rim joist materials you must have the connection designed by an engineer. Lag screws may be spaced at 16. Calculate the initial value for d then round it up to the nearest inch. Typically you will need to install your bolts alternating high and low 2 from the top and bottom of the ledger board.

If your local building authority has a rafter spacing code you may not space rafters wider than required by code. 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. This means the example porch would need a 6 inch by 8 inch beam. The closer the rafters are to each other the stronger the roof will be.

You want a flashing that won t react with. 2x6 p treated bolted as the size of your deck. As a rule of thumb bolts can be spaced 16 on center for supporting joist span up to 12 in length. Typical rafter spacing codes will specify a minimum spacing of 16 inches 19 2 inches or 24 inches.

If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. In the example d calculates to 7 75.