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.

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. Flat truss a truss which has the top chord parallel to the bottom chord over the entire length of the truss. Overhang the extension of the top chord of a truss beyond the bottom chord measured horizontally b. There are two main types of timber roof trusses.

Use our top chord truss calculator to estimate your rake length for roof sheathing. 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. Truss a pre built structural member capable of supporting a load over a given span. 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.

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. 500 sycamore street p o. Pitched truss any truss in which the top chord is sloped and the bottom chord is horizontal. Top chord an inclined or horizontal member that establishes the upper edge of a truss usually carrying compression and bearing stress.