Ridge Board Of Roof

Rafters are nailed to the ridge board and run down to overhang the exterior wall.

Ridge board of roof. The rafters and trusses that are part of the overall. Carpenters measure roof pitch as inches of rise per 12 inches of run. A ridge board is a non structural member that serves as a prop for opposing rafters to rest against and connect to. Ridge beam sizing is based on the span of the beam between supports and the amount of roof load supported by the beam.

Ridge beams are required by code if the roof slope is less than 3 in 12 irc section r802 3. 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. 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. Its only job is to provide a connection point for the roof joists on each side of the roof.

Timber steel framing manual single span ridge beam. The pitch of a roof determines the height of the ridge board that runs the length of the house. Ridge boards and beams. 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.

The ridge board must be set as perfectly as possible so take your time and use careful measurements. A 1 in 12 roof pitch roof rises 1 inch for every 12 inches of run. Rafter to ridge beam connection framing roof ceiling construction structural ridge beam absolute deflection in a ridge beam structural ridge beam tricks of the trade. 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.

Is 22 ridge board too long of a span worried about roof sag. Ridge board the engineering principles of the ridge board are a bit more complicated. 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. 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.

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.