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    john thomas's Avatar
    john thomas Posts: 1, Reputation: 1
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    #1

    Nov 28, 2006, 07:42 PM
    Ceiling joist spans
    What is the recommended ceiling joist spans on new home construction - 16 in or 24 in and what are the maximum spans for each?
    skiberger's Avatar
    skiberger Posts: 562, Reputation: 41
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    #2

    Nov 28, 2006, 08:43 PM
    16"oc for stick framed and 24"oc for trusses.

    The maximum span for a 2x6 16" oc (typicall ceiling joist) is 13'9"-18'9" depending on the species of wood and the grade used. Hem fir ranges from 10'6" to 11'3" and spruce-pine-fir ranges from 13'9" to 16'11"

    For 24"oc the spans vary from 11'2" to 16'4". Hem fir ranges from 11'2" to 15'6" and spruce-pine-fir ranges from 11'2' to 15'2".

    These numbers are for uninhabitable attics without storage
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