Roof Truss Top Chord

In historic carpentry the top chords are often called rafters and the bottom chord is often referred to as a tie beam.

Roof truss top chord.

500 sycamore street p o. Truss a pre built structural member capable of supporting a load over a given span. Flat truss a truss which has the top chord parallel to the bottom chord over the entire length of the truss. There are two main types of timber roof trusses.

A truss consists of one or more triangles in its construction. Top chord an inclined or horizontal member that establishes the upper edge of a truss usually carrying compression and bearing stress. Overhang the extension of the top chord of a truss beyond the bottom chord measured horizontally b. Pitched truss any truss in which the top chord is sloped and the bottom chord is horizontal.

Difference in slope between the top and bottom chords is at least 3 12 or the bottom chord pitch is no more than half the top chord pitch. Pitch 12 span ft in overhang ft in rounded to the nearest 1 32. 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. 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.