Attic Truss Bottom Chord Size

The bottom chord of the cap truss is typically moved up 1 1 2 for 2x4 continuous lateral restraints over the flat top chord of the base truss or the thickness of whatever material may be used 3 4 for plywood osb etc. The guidance you mentioned of bottom chord depth no greater than l 22 where l is the floor span is not unusual. For traditionally spaced trusses the bottom chord is cut out of 2x4 or 2x6 dimension lumber but can also be cut out of 2x8 2x10 2x12 and even lvl material for roof trusses.

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Factors that determine the size of the bottom chord include on center spacing dead loads applied to the truss span and if there is any pitch applied to the bottom chord.

Attic truss bottom chord size. L 24 is often used as a maximum ratio for floor span depth but that is not codified in any way that we know of. 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. Some designers use more conservative ratios such as the l 22 you mentioned or even l 20. Most economical when the 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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