A truss consists of one or more triangles in its construction.
Roof truss top chord.
Top chord an inclined or horizontal member that establishes the upper edge of a truss usually carrying compression and bearing stress.
In historic carpentry the top chords are often called rafters and the bottom chord is often referred to as a tie beam.
Overhang the extension of the top chord of a truss beyond the bottom chord measured horizontally b.
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.
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Pitched truss any truss in which the top chord is sloped and the bottom chord is horizontal.
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.
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Truss a pre built structural member capable of supporting a load over a given span.
There are two main types of timber roof trusses.