Roof Without Ridge Board

The engineer has designed this exposed roof to have the rafters meet up at the top and have cats or brace boards installed in place of ridge board in between rafters.

Roof without ridge board. Roof framing without a ridge board hey i was wondering if any of you have ever actually framed a roof before without a ridge beam. Ridge beams are required by code if the roof slope is less than 3 in 12 irc section r802 3. Collar ties rafter ties tension beams structural ridge beams. It s often just a nice way to bring the rafters together.

A ridge board isn t a beam per se. A ridge board is a non structural member that serves as a prop for opposing rafters to rest against and connect to. 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. 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.

Also measure the length of half of the roof from one side of the ridge beam to the edge of the building. The ridge board s length will be the outside measurement of the building plus the length of the overhang at both ends. You may splice two boards together to achieve this length if necessary using a 14 and 1 2 inch block of the same material. Ridge beam sizing is based on the span of the beam between supports and the amount of roof load supported by the beam.

If you re using a roofing calculator press the pitch button to input the pitch ratio in the calculator s memory. A proper beam would have a supporting post at each end. The ridge board forms the peak and ties the rafters together side to side and end to end. Rafters and a ridge board are the key components of a roof framing system.

The rafters support the sides or slope of the roof. Other elements like gable studs and cross ties supply additional bracing. Some of these can support the roof and prevent ridge sagging and wall spreading. You don t need a ridge beam but you do need a way to keep the walls from spreading.

If the roof rises 7 inches 18 cm for every 1 foot 0 30 m its pitch would be written as 7 12. For 2 x 6 rafters use a 2 x 8 ridge board and so on.