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08-13-2009, 08:26 AM
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#1
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Chief hand holder
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Treated Lumber Spans
Search didn't turn up anything.
Anybody have a good source for calculating treated lumber spans for decks?
The books and online table I have don't specify treated.
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08-13-2009, 08:33 AM
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#2
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Pro
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Just use the span tables in the IRC..treated has nothing to do with the span...only the species does.
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08-13-2009, 08:54 AM
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#3
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Chief hand holder
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So I can follow the table for southern pine, US lumber?
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08-13-2009, 09:53 AM
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#4
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Curmudgeon
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Quote:
Originally Posted by bert0168
So I can follow the table for southern pine, US lumber?
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This one is handy. 
http://www.awc.org/calculators/span/...izontal%2BSpan
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The Following User Says Thank You to neolitic For This Useful Post:
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08-13-2009, 12:18 PM
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#5
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Chief hand holder
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Thanks Neo, that's the one I have.
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08-13-2009, 12:31 PM
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#6
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Pro
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The Following User Says Thank You to Greg Di For This Useful Post:
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08-13-2009, 05:10 PM
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#7
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Pro
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Also remember that treated wood gets much stiffer as it dries out, so don't freak if you feel a tiny bounce in your floor after following the span tables.
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08-13-2009, 05:24 PM
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#8
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Chief hand holder
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Quote:
Originally Posted by Greg Di
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Thanks Greg, lots of info there.
I was surprised at the spans allowed for 2 x 8's
BTW, what number would you use for dead load on a solid composite deck with no furniture?
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08-13-2009, 05:48 PM
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#9
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Pro
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If the PT lumber is incised, the values do go down substantially. We use Douglas Fir that is incised when treated. The span on a 2x8 decreases a foot with incising.
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08-13-2009, 06:59 PM
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#10
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Chief hand holder
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I don't think we have incised lumber out here.
I think that is the stuff you see the nicks all over it, right?
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08-13-2009, 07:07 PM
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#11
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Curmudgeon
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Quote:
Originally Posted by bert0168
I don't think we have incised lumber out here.
I think that is the stuff you see the nicks all over it, right?
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'Bout the only time we see it
is doug fir power poles.
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