Roof Rafter Ridge Board

The rafters support the sides or slope of the roof.

Roof rafter ridge board.

Ridge beam sizing is based on the span of the beam between supports and the amount of roof load supported by the beam. Some of these can support the roof and prevent ridge sagging and wall spreading. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. The roof rafters provide integral structural support to the roof.

For 2 x 6 rafters use a 2 x 8 ridge board and so on. Collar ties rafter ties tension beams structural ridge beams. A ridge board is a non structural member that serves as a prop for opposing rafters to rest against and connect to. The boards creating the slope of the roof are wider than lumber used to build trusses 2x8s 2x10s and 2x12s are most common in rafters vs.

Rafters and a ridge board are the key components of a roof framing system. It is always better to have a large rafter rather than be concerned with a sagging roof. This video shows how to make roof rafters with a rafter square and or a speed squ. Choose a ridge board that is one size larger than your common rafters.

Structures such as sheds or barns can be frames with rafters every 24 again make sure to consult local codes. A ridge board was not always required and the photo above of the attic in a 1920s era house shows a roof. This means that the ridge board for 2x6 rafters for example must be more than the nominal 6 inch height of the rafters because the diagonal cut at the ridge end of the rafter makes the vertical dimension of the face a larger dimension. If you re framing a gable roof on a new house or building a shed or even a doghouse with a gable roof you ll need to cut a number of roof rafters.

If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. The ridge board s length will be the outside measurement of the building plus the length of the overhang at both ends. 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 article describes and illustrates the different types of support that prevents roof sagging and wall bulging at buildings including definitions of collar ties rafter ties and structural ridge beams.

For 2 x 4 rafters use a 2 x 6 ridge board. Other elements like gable studs and cross ties supply additional bracing. In finished space insulation is placed between the rafter boards and drywall or other material is fastened to the face. Rafter boards are fastened to the ridge board at the peak and the top plate where they join the wall.