Roof Frame Wood

The rafters are usually positioned directly above the wall studs.

Roof frame wood.

In a typical roof framed with dimension lumber the rafters rest on the exterior wall top plate at the lower end and bear against a ridge board at the top. You should be able. Most roofs utilize 16 inch spacings for strength and rigidity. Start by marking the plumb line the horizontal line that marks where the wall will meet the rafter.

Measure your seat cuts. Measure form the top of this line down the board to determine the line length or length of the rafter less the ridge. If the unit of rise in inches is 3 then the cut is the unit of rise and the unit of run 12 inches or 3 12. Stick framing combines roof rafters with ceiling joists.

The pitch of the roof refers to the angle or steepness of the roofing frame. Like wall studs and floor joists rafters and trusses are spaced every 16 or 24 inches from center to center. Add the length of the overhang beyond this mark and. Figure 2 2 roof framing terms.

1 8 pitch is given so 24 x 1 8 equals 3 or unit of rise in inches. While you re at it some carpenters. Line length is the hyptenuse of the triangle whose. Position the square at the end of the rafter board with the tongue on your left and facing away from you.

No matter which kind of roof framing is used they both contain one element that you ll need to be familiar with and that s the pitch of the roof. My purpose here is to clarify the differences between solid lumber and wood i joists and to provide some hints to make roof framing with wood i joists easier.