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Unread 03-24-2011, 06:26 PM   #1
rv9er
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Subfloor "leveling": CBB vs. SLC

Hello Group,

I am a DIYer doing a kitchen tile remodel (~12x10') in my 1950's house. I have already brought the floor down to the original subfloor of 1 by 10" boards laid diagonally across 2x10", 16" OC, 10' floor joists. After screwing these boards to the joists, I added a 3/4" plywood (Sturdifloor) layer, staggered and screwed to the original subfloor. After finishing this, there are some slight low areas and also a ridge in the floor that is about 1/8" above the rest of the floor (both ends of the room slope up to it). This is probably a higher floor joist that I didn't notice before laying the plywood. I am planning on using 1/4" concrete backer board below 12x24 tile.

Now my questions:

1) For the low spots, I was going to fill with cement based leveling compound. Do I do this before or after laying the concrete backer board (CBB).

2) For this "ridge", can I just sand down the plywood in this area with a belt sander to get it close to flat or should I instead use a self leveling compound over the entire floor and skip the CBB?

3) For the 1/8" expansion joints between the plywood panels, how should I fill these (caulk, tape, etc) before either the thinset for the CBB or the self-leveling compound?

Sorry for the long winded post. I have enjoyed learning from this site. Thanks for any suggestions!

Regards,

David
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Last edited by rv9er; 03-24-2011 at 09:58 PM.
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Unread 03-24-2011, 07:01 PM   #2
muskymike
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Hi David, welcome! Yes you can sand the spot down. I would put the CBU in with thinset under it then level on top of the CBU. For the gaps between the ply I never worried about them with the thinset.
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Unread 03-24-2011, 09:21 PM   #3
dhagin
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What he said.

CBU = Cement Backer Unit = durock or equal.
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"the road to hell is paved with osb, mastic, pre-mixed latex 'grout' or 'thinset', "
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Unread 03-24-2011, 09:55 PM   #4
rv9er
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Mike and Dana -

Thanks your your suggestions! I guess it is time to get out the big sanders. I'll let you know how it goes.
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Unread 03-25-2011, 08:24 PM   #5
dhagin
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If I have a lot of sanding, I'll rent a floor sander & edger. The kind used for refinishing hardwood. Get an ample supply of the coarse belts & disks.
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