Roof Truss Bottom Chord

It is utilized in a framed roof comprised of rafters and a ceiling joist.

Roof truss bottom chord.

This creates additional surface area for the two members to transfer forces and allows for them to be plated together creating a strong resilient joint. Those trusses were engineered with a heavy critical dependency on the bottom chords which are in tension. For example if the bottom of the truss is buried in insulation while the remainder is in the open attic air this condition can occur. The horizontal beam of the triangle of a bottom chord is used in this simple triangle truss construction.

And the responses from the experts and my take on each one. Roof truss uplift occurs when the bottom chord of the truss is exposed to significantly different moisture or temperature conditions than the rest of the roof truss. In standard heel applications of roof trusses the bottom chord is cut on each end at an angle consistent with the roof pitch of the truss. The trusses are 42 long with a 2x10 bottom chord 3 12 pitch.

The stability of this shape supported by the bottom chord is the reason for the common usage of the triangle truss. Continue reading below our video of the day.