Roof Truss Top Chord

The parallel chord truss or flat truss gets its name from its parallel top and bottom chords.

Roof truss top chord.

It is often used for floor construction. The bottom chord of the cap truss is typically moved up 1 1 2 for 2x4 continuous lateral restraints over the flat top chord of the base truss or the thickness of whatever material may be used 3 4 for plywood osb etc. Pitched truss any truss in which the top chord is sloped and the bottom chord is horizontal. Top chord bearing on frame wall top chord bearing on masonry wall top chord cut after installation intermediate bearing continuous floor truss special engineering required roof floor truss manual 7 31 08 10 43 am page 10.

A combination of the two is a truncated truss used in hip roof construction. Pitch 12 span ft in overhang ft in rounded to the nearest 1 32. The same thing is true for the bridge of the truss. Beam pocketa rectangular opening within a truss to accept a header beam for positive load transfer.

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. Use our top chord truss calculator to estimate your rake length for roof sheathing. A truss consists of one or more triangles in its construction. Bending momenta measure of the bending effect on a member due to forces acting.

The more complex the truss framework is the greater quantity of these joints will be required. The cap truss is very similar to a gable truss with webs transferring loads vertically into the base truss below it. Truss a pre built structural member capable of supporting a load over a given span. Closed in which the bottom chord is horizontal and at the foot of the truss and open in.

The top members of a truss are known generically as the top chord bottom members as the bottom chord and the interior members as webs in historic carpentry the top chords are often called rafters and the bottom chord is often referred to as a tie beam there are two main types of timber roof trusses. Finally the truss calculator will compute the best dimensional method to connect the pieces of the truss with steel joints and a bridge. 500 sycamore street p o. Top chord an inclined or horizontal member that establishes the upper edge of a truss usually carrying compression and bearing stress.

Web members that join the top and bottom chords to form triangular patterns that give truss action usually carrying tension or compression stresses. Box 177 la crescent mn 55947 507 895 8400. Peak point on a truss where the sloped parts meet. Trusses to support roof covering.