Roof Ledger Board Size

Lag screws may be spaced at 16.

Roof ledger board size.

Typically you will need to install your bolts alternating high and low 2 from the top and bottom of the ledger board. It is always better to have a large rafter rather than be concerned with a sagging roof. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. House rim joist must be minimum of 2x sawn lumber or 1 in.

Douglas fir lvl no attachment is allowed to strand lumber syp lvl the mudsill i joists floor trusses or other materials. The closer the rafters are to each other the stronger the roof will be. 2x6 p treated bolted as the size of your deck. It should be 6 8 inches above grade ideally but you can get ground contact pt that can be placed closer.

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. If your local building authority has a rafter spacing code you may not space rafters wider than required by code. You want a flashing that won t react with. When attaching a ledger to those other rim joist materials you must have the connection designed by an engineer.

Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. 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. This means the example porch would need a 6 inch by 8 inch beam. This tells you the size of the beam needed to support the porch s roof.

In the example d calculates to 7 75. X 9 in.