Roof Frame Wood

Stick framing combines roof rafters with ceiling joists.

Roof frame wood.

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. Line up the square with the plumb line then rotate it 180 degrees realigning the square on the other side of the. You should be able. The rafters are usually positioned directly above the wall studs.

Start by marking the plumb line the horizontal line that marks where the wall will meet the rafter. Add the length of the overhang beyond this mark and. Conventional framing the first thing to understand is how a roof framed with wood i joists differs structurally from a traditional stick framed roof. 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.

While you re at it some carpenters. 1 8 pitch is given so 24 x 1 8 equals 3 or unit of rise in inches. Position the square at the end of the rafter board with the tongue on your left and facing away from you. Figure 2 2 roof framing terms.

Like wall studs and floor joists rafters and trusses are spaced every 16 or 24 inches from center to center. The pitch of the roof refers to the angle or steepness of the roofing frame. Line length is the hyptenuse of the triangle whose. Most roofs utilize 16 inch spacings for strength and rigidity.

Measure form the top of this line down the board to determine the line length or length of the rafter less the ridge. 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.