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Treated Lumber Spans

5411 Views 10 Replies 6 Participants Last post by  neolitic, 
B
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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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J
Just use the span tables in the IRC..treated has nothing to do with the span...only the species does.
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B
So I can follow the table for southern pine, US lumber?
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N
bert0168 said:
So I can follow the table for southern pine, US lumber?
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This one is handy. :thumbsup:

http://www.awc.org/calculators/span...o.+2&submit=Calculate+Maximum+Horizontal+Span
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B
Thanks Neo, that's the one I have.
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G
http://www.southernpine.com/spantables.shtml

Anything you'd every want for SYP.
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C
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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B
Greg Di said:
http://www.southernpine.com/spantables.shtml

Anything you'd every want for SYP.
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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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R
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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B
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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N
bert0168 said:
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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