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davethompson413 t1_jef6uof wrote

Reply to comment by Doctor_Frasier_Crane in Need to hang something from ceiling and unsure what lumber to use by me-chewbacca

They're not joists. Joists are structural, 2x4s are not. It really is that simple. When running horizontally, there is no span chart for a 2x4.

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Doctor_Frasier_Crane t1_jefd3ox wrote

Technically, that’s correct, they’re part of the truss assembly. The bottom chord.

A quick Google search does find plenty of results for span tables that includes 2x4’s though.

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davethompson413 t1_jefj786 wrote

Span charts for 10 pounds per square foot. Not really walkable. And at 30 psf, the 2x4s disappear from the chart.

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