Ridge Beam Or Girder Roof Truss

In finished space insulation is placed between the rafter boards and drywall or other material is fastened to the face.

Ridge beam or girder roof truss.

Ridge beams are required by code if the roof slope is less than 3 in 12 irc section r802 3. Horizontal beams supported by posts and used to support the mid span of rafters to cover longer spans these are used in large buildings like the traditional large old barns in the us. In howe fink trusses the bottom chord is also a tension tie. The fink truss and the howe truss.

Yes either a ridge board or a ridge beam is necessary and required by the building code where roof rafters meet at the the center of their span. I can t ever recall seeing a saltbox shed built with a ridge beam or even a gambrel roof shed for that matter. Come to think of it the only style shed i can see that would be easy to use a ridge beam is the gable style shed. Rafter boards are fastened to the ridge board at the peak and the top plate where they join the wall.

But instead of a beam which would have dropped below the ceiling the remodeler installed the girder truss. While this article focuses on configurations we also have a very cool set of illustrations showcasing the different parts anatomy of roof trusses. The boards creating the slope of the roof are wider than lumber used to build trusses 2x8s 2x10s and 2x12s are most common in rafters vs. One of a series of diagonal members of the truss that meet at the apex in order to support the roof deck and its loads.

Bending momenta measure of the bending effect on a member due to forces acting. A ridge board is a non structural member that serves as a prop for opposing rafters to rest against and connect to. Note that because it tapers at the end like any roof truss it can fit in the short space at the eaves where a beam might not fit. Leave ridge beam for shed construction page.

Roof truss parts explained. Bearing a structural support usually a wall that occurs at the top or bottom chord or between the end points of a roof or floor truss. Ridge beam sizing is based on the span of the beam between supports and the amount of roof load supported by the beam. The difference between them is that a ridge beam is a structural member that bears half of the live and dead loads of the rafters on either side of it but a ridge board is not structural.

Trusses to support roof covering. A ridge beam essentially allows us to hang a roof over the beam such that rafter ties can be omitted giving a cathedral ceiling with a completely open space below. These illustrations illustrate two common wood roof truss designs.