Roof Truss Chord

See gusset construction below.

Roof truss chord.

The same thing is true for the bridge of the truss. It is most often used for roof construction. There are two main types of timber roof trusses. Dropped chord roof truss.

Box 177 la crescent mn 55947 507 895 8400. The bottom chord which is the bottom of the framed truss. Hip end trusses that are supported by. Finally the truss calculator will compute the best dimensional method to connect the pieces of the truss with steel joints and a bridge.

End trusses close in the end of a building and provide a nailing surface for the upper end wall or rigid sheathing. Some common trusses are named according to their web configuration such as the king post fan fink or howe truss. Truss that creates roof planes and does not support other trusses truss that creates hip plane by truncating and allowing hip jacks truss top chords to fly over. Variance from the design dimensions is also allowed.

Any weight imposed on the end truss is directly transferred to the endwall which transfers the weight to the foundation. 500 sycamore street p o. All truss designs are optimized to provide the most economical configuration for the specific application. The chord size and web configuration are determined by span load and spacing.

These trusses are positioned on the top plate of the endwall so the entire bottom chord is supported by the wall. Similar to the raised heel truss this type also creates a vapor barrier creating great insulation characteristics. Closed in which the bottom chord is horizontal and at the foot of the truss and open in which the bottom chords are raised to provide more open space also known as raised bottom chord trusses. For example table 3 5 1 allows identical trusses to vary in span by as much as 1 2 in.

There are three parts to the roof truss that you have to know. Complying with the erection tolerances specified in sbca s bcsi b1 summary sheet is critical to achieving an acceptable roof line. The parallel chord or flat truss gets its name from having parallel top and bottom chords. Finally there are the gussets that hold the framed truss together.

The dropped chord variant is composed of a convention truss with a secondary chord truss suspended below to help reduce uplift. These steel joints are needed to support the overall truss. Bottom chords is at least 3 12 or the bottom chord pitch is no more than half the top chord pitch. Flat the most economical flat truss for a roof is provided when the depth of the truss in inches is approximately equal to 7 of the span in inches.

Then there is the top chord or rafters that are angled to make the roof pitch. Truss that supports creeper trusses and creates hip roof plane. And in height by as much as 1 4 in. Hip end trusses that are supported by hip truss and creates hip plane.