Ridge Beam Or Girder Roof Truss

Bending momenta measure of the bending effect on a member due to forces acting.

Ridge beam or girder roof truss.

Rafter boards are fastened to the ridge board at the peak and the top plate where they join the wall. Just as there are many types of roofs with many roof parts there are many different types of roof trusses this extensive article explains through a series of custom truss diagrams the different truss configurations you can use for various roofs. In finished space insulation is placed between the rafter boards and drywall or other material is fastened to the face. 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.

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. In howe fink trusses the bottom chord is also a tension tie. While this article focuses on configurations we also have a very cool set of illustrations showcasing the different parts anatomy of roof trusses.

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. 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. 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. It s lighter than a solid beam would have been too making the lifting a little easier.

Ridge beams are required by code if the roof slope is less than 3 in 12 irc section r802 3. Leave ridge beam for shed construction page. Roof truss parts explained. 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. Trusses to support roof covering. 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. 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.

These illustrations illustrate two common wood roof truss designs. Beam pocketa rectangular opening within a truss to accept a header beam for positive load transfer. The fink truss and the howe truss.