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NOTE: This is an unformatted excerpt from our online fire protection training library.

Fire Alarm Plans and Code Requirements

Parallel Chord Truss

The longer the span between parallel chord trusses, the heavier, or more rugged they must be to support the weight they carry. For example, in a large aircraft hanger, the need for open space is critical, so larger trusses are used, perhaps shaped as an arch at the roof for added strength. The top chord of these larger trusses may well be in excess of four inches. Thus, for the purposes of the fire alarm code, these larger top chords may well be beams. They won't be joists, because the spacing between the trusses will always be in excess of three feet.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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