Standard Width Of Roof Trusses

Girder trusses are designed to carry additional loads other than standard roof loads.

Standard width of roof trusses.

There is a misconception that spacing trusses every 16 on center is better because it will be strong than the average 2. A truss with the same pitch and heel on both sides and a peak at the center is called a common truss. Common spacing for trusses on this type of building is often between 2 and 4 feet but trusses built with advanced designs may allow spacing as great as 8 or 12 feet. Once you ve calculated the number of trusses you will need you should purchase the lumber.

Almost all residential trusses use this spacing. Essentially a roof truss is a prefabricated frame of supports designed to go on top of a building as it s being built. Easily attached to the rest of the building s frame they circumvent the complicated expensive nature of from scratch roof framing and can be purchased in a wide variety of designs made from either lumber commonly used for homes or metal primarily used for commercial. They are designed at a 4 12 pitch to be spaced 2 foot on center.

Putting the trusses into place. These trusses the meet building code criteria as specified by structural building components of america sbca and the truss plate institute tpi. Roof truss span tables alpine engineered products 15 top chord 2x4 2x6 2x6 2x4 2x6 2x6 2x4 2x6 2x6 2x4 2x6 2x6 bottom chord 2x4 2x4 2x6 2x4 2x4 2x6 2x4 2x4 2x6 2x4 2x4 2x6 2 12 24 24 33 27 27 37 31 31 43 33 33 46 2 5 12 29 29 39 33 33 45 37 38 52 39 40 55 3 12 34 34 46 37 39 53 40 44 60 43 46 64 3 5 12 39 39 53 41 44 61 44 50 65 47 52 70. Steeper roof pitches require longer webs which add to the cost.

This 26 span truss with a 4 12 roof pitch is the most economical truss we can build. The standard roof truss spacing is 2. Most are spaced between 18 26 inches apart. The same is true if we make it steeper.

The trusses should be a little longer than the exact width to allow for overhang and you will need sufficient trusses to mount across the length. It will use the current cost of wooden rafters based on the average price found at home improvement stores. If we go any larger it will require more webbing inside the truss which will directly affect the cost of the truss. Pre manufactured stock trusses are constructed with spruce pine fir spf or southern yellow pine syp lumber.

The same concept holds true for roof trusses. This online truss calculator will determine the all in cost of your truss based on key inputs related to the pitch width and overhang of your roof.