In traditional house framing also called stick framing a basic roof frame consists of opposing pairs of sloping rafters that meet at their top ends at a ridge board or ridge beam.
Ridge board of roof.
A ridge board was not always required and the photo above of the attic in a 1920s era house shows a roof framed without one.
The pitch of a roof determines the height of the ridge board that runs the length of the house.
Carpenters measure roof pitch as inches of rise per 12 inches of run.
Ridge beam sizing is based on the span of the beam between supports and the amount of roof load supported by the beam.
Rafters are nailed to the ridge board and run down to overhang the exterior wall.
Its only job is to provide a connection point for the roof joists on each side of the roof.
Because the ridge board is a smaller member typically only an inch thick sometimes even less it is not a structural member and doesn t carry the gravity load.
Timber steel framing manual single span ridge beam.
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A 1 in 12 roof pitch roof rises 1 inch for every 12 inches of run.
A ridge beam carries the loads of the rafters connected to it and must be both strong enough to carry the weight and well supported at the bearing points at each end to transfer the loads down to the ground.
In part 3 of our roof framing series we cover how to select a ridge board how to layout a ridge board how to mark it so you know where to fasten the raft.
The rafters and trusses that are part of the overall.
The top end of each rafter is cut at an angle so that it meets flush with one broadside of the ridge board and the ridge is sandwiched between the rafters.
This video shows how to make roof rafters with a rafter square and or a speed squ.
A ridge board is a non structural member that serves as a prop for opposing rafters to rest against and connect to.
Ridge board the engineering principles of the ridge board are a bit more complicated.
Is 22 ridge board too long of a span worried about roof sag.
The ridge board runs the length of the building and provides support for the tops of the rafters helping the whole roof structure work together as a system.
Ridge beams are required by code if the roof slope is less than 3 in 12 irc section r802 3.
Specifically the ridge board is a section of solid timber or metal that is positioned horizontally along the line of the ridge of the roof.
