Roof Truss Top Chord

Overhang the extension of the top chord of a truss beyond the bottom chord measured horizontally b.

Roof truss top chord.

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. Pitched truss any truss in which the top chord is sloped and the bottom chord is horizontal. Pitch 12 span ft in overhang ft in rounded to the nearest 1 32. There are two main types of timber roof trusses.

Use our top chord truss calculator to estimate your rake length for roof sheathing. 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. 500 sycamore street p o. A truss consists of one or more triangles in its construction.

Flat truss a truss which has the top chord parallel to the bottom chord over the entire length of the truss. 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. Box 177 la crescent mn 55947 507 895 8400. In historic carpentry the top chords are often called rafters and the bottom chord is often referred to as a tie beam.