Flat Roof Trusses Span

05425 cold formed steel trusses roof truss spans every trussteel roof truss is a custom design based upon the unique load span bearing use and code criteria of a particular project.

Flat roof trusses span.

The offset scissor truss has a bottom chord that is flat for a distance and then is vaulted up and back down. Trusses only use 2 4 lumber and are constructed using a web of 2x4s for strength. Total load psf duration factor live load psf roof type 55 1 15 40 snow shingle 55 1 15 30 snow tile 47 30 snow 40 20 snow 1 25 20. Parallel chord trusses allow for greater interior clearance in buildings.

The load span tables shown below demonstrate only a tiny subset of the possible combinations available with trussteel cfs roof trusses. The shapes and spans shown here represent only a fraction of the millions of designs produced by alpine engineers. The same thing is true for the bridge of the truss. And parallel to floor truss span strongback lateral supports 24 max.

Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run. Finally the truss calculator will compute the best dimensional method to connect the pieces of the truss with steel joints and a bridge. While this article focuses on configurations we also have a very cool set of illustrations showcasing the different parts anatomy of roof trusses. The reason for this is that flat or shallow roofs withstand much more abuse and loads than steeper roofs making wider shed roof rafters a necessity.

The exact height of the truss will depend on the height of the roof. When making a selection below to narrow your results down each selection made will reload the page to display the desired results. Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch. 72 5 0 mi ni m u m girder floor truss floor truss jacks a a bearing wall girder floor truss floor truss jacks bearing wall cantilevered floor truss two 2x rim joists 24 max.

Roof floor truss manual 7 31 08 10 43 am page 12. These steel joints are needed to support the overall truss. If you re adding a truss to a flat roof you ll have some control over what slope you want. Click to add item 24 spreadweb residential roof truss 5 12 pitch 87 to the compare list.

Lastly remember that we are not talking about trusses in this article just rafters. 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. Alpine truss designs are engineered to meet specific span configuration and load conditions. The partial scissor truss is similar except that the bottom chord slopes up in one direction and then straight down while the remaining portion is flat.