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Unread 09-18-2005, 06:54 PM   #1
LazyPup
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What Type of Subfloor do I need?

I have a circa 1930 two story victorian with a bathroom on the first floor.

The bathroom is 5' 6" wide and 12' long with the floor joists running lenthwise.

The floor is currently 3/4" tongue & groove oak flooring nailed directly to the 2 x 12 joists with no subfloor.

The T&G flooring undergoes considerable dimensional changes season to season from humidity so i assume I may need a plywood subfloor under concrete backerboard before installing tile.

We are planning to install 12 x 12 ceramic tile but The concern is that we would like to keep the overall buildup to a minimum.

What would the experts advise for subflooring under the tile?
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Unread 09-18-2005, 08:38 PM   #2
Jason_Butler
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What is the spacing of the 2x12 joists and what is the maximum unsupported span- ie the distance between the supports along the joist.

Jason
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Unread 09-18-2005, 08:54 PM   #3
LazyPup
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The 2 x 12 are 16" on center with a 16' span
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Unread 09-18-2005, 09:06 PM   #4
Tool Guy - Kg
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Jason is referring you to the "Deflectolator". It is a calculator that figures out if your joist structure is strong enough for tile in the first place. According to the "Deflectolator", you may or may not be strong enough for tile. It depends if you have a stronger wood for your joists like Southern Yellow Pine or Fir...........or if you have a wood of weaker properties. Try to identify the wood the joists are made from and give the "Deflectolator" a visit. It's important.

You need a dead minimum of 3/8" ply before you install cement board or Ditra over that hardwood. 1/2" or 5/8" would be better.
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Unread 09-19-2005, 02:38 AM   #5
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This house is in N.E. Ohio and there was a local sawmill within two miles when the house was origiinally built where they cut and milled local hardwoods.

The 2 x 12 joists are full cut 2 x 12 oak.
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Unread 09-19-2005, 05:58 AM   #6
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If you really want to save height, remove the 3/4" T&G, and replace it with 3/4" T&G plywood and an underlayment of your choice.
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