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Old 10-18-2012, 03:24 PM   #1
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Tiling over 2x8 T&G Flooring


The floor of my house consists of 2x8 Doug Fir Tongue and Groove w 4ft span. It is pretty stout. I want to re-tile my bathroom floor, and would like to use the Kerdi waterproofing membrane. Based on the research I have done it sems like I am going to need a lot of layers (too many?).

Here is what I have gathered: screw plywood over existing 2x8 floor, then use thinset to secure CBU, then thinset the DITRA membrane over CBU, then tile. This seems like a lot of layering. Can I eliminate any of these layers? Is my method correct? If I don't use the DITRA membrane, is there something that I should do to the CBU before tiling?

Should I eliminate the CBU and put the DITRA on the plywood?

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Old 10-18-2012, 03:36 PM   #2
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Tiling over 2x8 T&G Flooring


if you use the cbu you do not need the ditra. use one or the other

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Old 10-18-2012, 04:32 PM   #3
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Tiling over 2x8 T&G Flooring


You say the 2X8 t&g spans 4 feet. Is that 4 foot span between joists? Or the joist span is 4 feet. If so, what size joists and what spacing?
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Old 10-18-2012, 04:56 PM   #4
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Tiling over 2x8 T&G Flooring


You can also eliminate some layers by removing the T&G planks,
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Old 10-18-2012, 07:43 PM   #5
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Tiling over 2x8 T&G Flooring


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Originally Posted by Jet
You can also eliminate some layers by removing the T&G planks,
No he can't Jet. His house is built with the joists 4' apart, he needs 2x lumber as the subfloor. It's typical left coast construction, pier & post.

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Old 10-18-2012, 08:08 PM   #6
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Tiling over 2x8 T&G Flooring


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No he can't Jet. His house is built with the joists 4' apart, he needs 2x lumber as the subfloor. It's typical left coast construction, pier & post.

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Your right Jaz I didn't read the post correctly yet again....eeeek
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Old 10-19-2012, 09:56 AM   #7
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Tiling over 2x8 T&G Flooring


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No he can't Jet. His house is built with the joists 4' apart, he needs 2x lumber as the subfloor. It's typical left coast construction, pier & post.

Jaz
Wouldn't there still be a great deal of deflection with 2X spanning 4 foot joists?
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Old 10-21-2012, 08:42 PM   #8
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Wouldn't there still be a great deal of deflection with 2X spanning 4 foot joists?
Yes there really should be blocking between joists IMO
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Old 10-21-2012, 10:17 PM   #9
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Tiling over 2x8 T&G Flooring


[QUOTE=drtbk4everWouldn't there still be a great deal of deflection with 2X spanning 4 foot joists?[/QUOTE]

You'd think so, but that's how they do it in parts of California, Oregon etc. There is no specification that approves that kind of framing for tile that I have found, apparently it works though.

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