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Old 06-17-2009, 11:59 AM   #1
Novelist
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T & G Decking Subfloor Question

I have 2x6 t&g fir decking over 4"x8" fir joists with a span of 48" o.c. Joists are supported every 8 feet.

Deflecto calculator does not address this configuration.

Does this floor provide eneough support for 1/2 " thick 18"x18" travertine?

Should I add plywood over decking and then backerboard? Or is 1/2" backerboard sufficient?
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Old 06-17-2009, 12:32 PM   #2
jgleason
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Hi Novelist,

One of the pros will be along in a bit to be more specific. For a stone floor you need two layers of plywood. You could follow that up with Ditra or a 1/4" cement backer board. Before any of that can occur I am pretty sure you will have to beef up your floor joists. If Injineer Bob (bbcamp) stops by he'll be able to tell you just what needs to be done.
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Old 06-17-2009, 01:05 PM   #3
dhagin
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We in the Northwest see these floors regularly. Check this thread for a discussion of your floor options.

http://www.johnbridge.com/vbulletin/...hlight=decking

Oh, and got a first name for us to use?
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Old 06-17-2009, 01:09 PM   #4
jgleason
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Not just the Northwest, my post and beam house here in the Northeast has the same subfloor construction.
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Old 06-17-2009, 07:24 PM   #5
Novelist
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Thanks for the tips and the link. The prospect of reinforcing joists in a 2 foot high crawl space is a bit daunting. I love the look of travertine, but now I'm thinking if I can find a nice tile, ceramic may be better for this space. It's a small kitchen and entryway about 8 x 14.

This site is really excellent.

Peter
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