Roof Truss Chord

There are two main types of timber roof trusses.

Roof truss chord.

All truss designs are optimized to provide the most economical configuration for the specific application. Any weight imposed on the end truss is directly transferred to the endwall which transfers the weight to the foundation. Closed open distinction is used in two ways to describe truss roofs. It is most often used for roof construction.

Bottom chords is at least 3 12 or the bottom chord pitch is no more than half the top chord pitch. The dropped chord variant is composed of a convention truss with a secondary chord truss suspended below to help reduce uplift. And in height by as much as 1 4 in. Truss that supports creeper trusses and creates hip roof plane.

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. 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.

Box 177 la crescent mn 55947 507 895 8400. Finally the truss calculator will compute the best dimensional method to connect the pieces of the truss with steel joints and a bridge. See gusset construction below. The chord size and web configuration are determined by span load and spacing.

Hip end trusses that are supported by. Finally there are the gussets that hold the framed truss together. The same thing is true for the bridge of the 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.

These trusses are positioned on the top plate of the endwall so the entire bottom chord is supported by the wall. For example table 3 5 1 allows identical trusses to vary in span by as much as 1 2 in. Variance from the design dimensions is also allowed. The bottom chord which is the bottom of the framed truss.

These steel joints are needed to support the overall truss. The more complex the truss framework is the greater quantity of these joints will be required. End trusses close in the end of a building and provide a nailing surface for the upper end wall or rigid sheathing. There are three parts to the roof truss that you have to know.

Dropped chord roof truss. 500 sycamore street p o. 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. Hip end trusses that are supported by hip truss and creates hip plane.