Roof Without Ridge Board

While the joists commonly attach to the side of a ridge beam they can also sit on top of it as shown in the diagram below which creates an interesting look.

Roof without ridge board.

Its only job is to provide a connection point for the roof joists on each side of the roof. Rafters and ridge boards. In conventional gable roof framing the slope of the roof is formed by rafters that run diagonally downward from the peak of the roof to the tops of the exterior walls of. The ridge board s length will be the outside measurement of the building plus the length of the overhang at both ends.

Ridge board the engineering principles of the ridge board are a bit more complicated. Ridge beam sizing is based on the span of the beam between supports and the amount of roof load supported by the beam. 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. You may splice two boards together to achieve this length if necessary using a 14 and 1 2 inch block of the same material.

A structural ridge is the standard alternative to ceiling joists. For 2 x 4 rafters use a 2 x 6 ridge board. 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. 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. In most applications the ridge board is not structural and only serves as a convienience for the carpenters as they frame the roof. This video shows how to make roof rafters with a rafter square and or a speed squ. One collar tie would be enough in your case.

A ridge board is a non structural member that serves as a prop for opposing rafters to rest against and connect to. In this design the tops of the rafters attach to a load bearing ridge beam that runs along the length of the roof. This can be accomplished with collar ties boards spanning the shed at ceiling height or with large gussets further up the rafter slope.