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Old 10-11-2008, 07:05 AM   #1
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Sub flooring Structure


I am building a new home and want to use tile what thickness sub flooring should I use?

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Old 10-11-2008, 07:13 AM   #2
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I am building a new home and want to use tile what thickness sub flooring should I use?
3/4" Tongue & Groove plywood glued and screwed.

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Old 10-11-2008, 09:54 AM   #3
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3/4" Tongue & Groove plywood glued and screwed.
Over 2x10's (at least) that are 16" on center (or closer) and try not to exceed a 13' unsupported span (the smaller the span the better).

Double the plywood if you change your mind to natural stone.

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Old 10-11-2008, 04:02 PM   #4
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Sub flooring Structure


Not trying to cause trouble by posting, only pointing out the wrong info that someone might take as gospel and cause problems down the road.

If you use those joist sizes mentioned, it will not support stone. That's even with two layers of plywood. The span has to be back around 10 to 10.5 ft. ( the span is a guess on my part.) The first sentence is true for stone.

If you are using engineered joists for the building of your home, it is the engineers responsibility to design a system that will support the intended use. It is also the owners responsibility to tell the GC or the engineering firm the intended use. This way they can design a system to accommodate both live and dead load to include what you plan on having for furniture and people.

Last edited by JJC; 10-11-2008 at 04:07 PM.
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Old 10-11-2008, 09:42 PM   #5
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Sub flooring Structure


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Not trying to cause trouble by posting, only pointing out the wrong info that someone might take as gospel and cause problems down the road.
No offense here, and thank you for the correction. Seems I had tile on the mind when I spit out my fast fingers response :-)

Yes, for 2x10's that are 16" on center, natural stone requires that the unsupported span is 10 feet or less.

Bigger joists or less distance between them changes it too. For example, with 2x12's 12" O.C. you're good to go with a 13' unsupported span.

- Bob
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Old 10-13-2008, 04:57 AM   #6
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three two four inches is sufficient thickness.

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