Roof Ridge Beam Definition

A structural ridge beam is required when independent support for high ends of rafters is necessary.

Roof ridge beam definition.

A ridge beam is a structural member used to support the ends of the rafters at the ridge transferring it s loads to posts or gable end walls. Although the names are unfortunately similar a ridge beam serves a much different purpose than a ridge board. Ridge beam a beam at the upper ends of the rafters below the ridge of a roof. The ridge beam is typically a larger member like a 4 x 12 and carries the gravity load of the roof joists just as the bearing wall or header does at the envelope.

With this design the ridge beam bears much more load weight than the ridge board on a standard stick framed roof. Conditions for which a ridge beam is required are described after discussion of a basic gable roof. It also supports joists trusses and other roofing elements. Definition of ridge board in construction the top board at the peak of a roof.

Ridge beam sizing is based on the span of the beam between supports and the amount of roof load supported by the beam. It supports the floor or roof above while adding integrity to walls. Ridge beams are required by code if the roof slope is less than 3 in 12 irc section r802 3. The rafters terminate against the ridge board unless the framing is designed to bear rafter against rafter with no ridge board.

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 classic example of the exposed ridge beam structure can be seen on our magnolia residence which is currently in construction. A timber frame roof has rafters and a ridge beam as with stick framing but the ridge is a large structural beam that the rafters sit on top of or sometimes fit into notches cut into the beam. A crown plate 2.

Please submit questions via email. Plural ridge beams carpentry the top longitudinal beam of a ridged roof where the top ends of the rafters meet. 818 mcgraw hill dictionary of architecture and construction. A roof beam is a load bearing member that is integral to the strength of the building.

A roof beam will be the thickest and most important element of a roof or levels within a property. Collar ties rafter ties tension beams structural ridge beams. Some of these can support the roof and prevent ridge sagging and wall spreading. The loads on the ridge beam are carried by vertical posts at the beam ends down through the building structural walls to the building foundation.