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Old 08-31-2009, 08:23 AM   #1
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Joist spacing

This is a joist spacing question. I am using rough sawn 3x10 floor joists, spanning 11 feet. One end rests on the sill, the other attached to a 6x10 center beam with double joist hangers. The flooring will be 2x6 tongue and groove. The joists and underside of the flooring will be exposed so I'd like to use as wide a spacing as practical. Would 32"oc be ok or should I go with 24"oc? All materials will be white pine. Thanks for your help.


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Old 08-31-2009, 12:51 PM   #2
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Western white pine (surfaced dry or surfaced green. used at 19% max. moisture content---
#2, 1-1/2"net. and 4" and wider, tongue and groove, with 925 fb---will span 4.5' (54") and safely carry 40# per square foot. This from the 1988 UBC. You could ask a lumber yard for the current code, if changed at all.
Be safe, G


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