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Old 10-30-2008, 04:39 PM   #1
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sub-floor prep for ceramic tile


Hi,

In my kitchen I have 5/8" ply over 1/2" on 2x8x13' at 16"OC.

I pulled up the 1/4" ply with stick on tiles and the staples were left behind, as well as some kind of thinset like material. I don't know if there was once a ceramic tile floor on the plywood subfloor, or if they put the 1/4" ply on the "thinset" stuff intentionally. The floor looks good but there are bare spots in the "thinset" covering. Maybe it was used as a floor leveler, but I can't see that the subfloor would have needed it.

Can I bang in the staples with a hammer (would be very hard to remove) and then feather in the bare spots with something (what?) and then use thinset (what kind?) to attach 1/4" backerboard.

(Note: I was going to cover the whole room in backerboard before I set cabinets and then tile around the cabinets. Are there any issues with setting my base cabinets on the backerboard?)

Thanks so much.

Rob

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Old 10-30-2008, 05:19 PM   #2
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sub-floor prep for ceramic tile


Quote:
feather in the bare spots with something (what?)
Portland based cement

Quote:
Are there any issues with setting my base cabinets on the backerboard
None that I can think of.

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Old 10-30-2008, 07:04 PM   #3
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sub-floor prep for ceramic tile


Hi Rob,

I was just in Alex a few weeks ago.

That cement product was probably for leveling as you stated. Hammer down the staples then check the floor for flatness using a long straight edge. When I say long I mean something close or over 10 ft. You may need more tweeking? The spec for floor flatness is; within 1/4" in 10 ft. AND 1/16" in 12" of the required plane.

The thinset required to install the backer isn't that important, depends on the brand of backer board you buy. Most want you to use modified thinset under the board, as well as to install the tiles.

Do I understand that your 2x8 joists are spanned 13 ft.? Did you actually measure that? If not, please measure the exact distance from face to face of the supports. Also see if they are stamped with a species and grade.

Jaz
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Old 10-30-2008, 07:48 PM   #4
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sub-floor prep for ceramic tile


Thanks Jaz,

I will post tomorrow, when I get off work, with exact span, species, and grade.

It's okay then to use any portland based floor leveler with what's there now? I see alot of posts about Detra... I like the idea of saving 1/8" in hieght. Should I use it instead of 1/4" durock and will it be okay to do the whole floor and put cabinets on?

Ciao,

Rob
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Old 10-30-2008, 09:14 PM   #5
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sub-floor prep for ceramic tile


Any patching must be Portland based. Of course be sure it's made for the substrate you have. May need to mix with an additive?

Ditra is much better than any CBU. It's more expensive too....but?

No need to cover the floor 100%, you can outline the cabinets and just go a little past them. They will need to be shimmed up to get them level anyway.

ciao,
Jaz
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Old 10-31-2008, 09:30 AM   #6
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sub-floor prep for ceramic tile


Thanks Jaz,

The stamp on the joists reads:

PLIB CONST
73 WCH
WCLB RULES

Doesn't mean anything to me ....hopefully that gives you the species and grade.

They are 2x8 spaning 12'-0" @16" OC.
Again it's 5/8" plywood over 1/2" plywood.

Thanks again.

Rob

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