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Unread 05-04-2012, 10:23 AM   #1
dstehle
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Durock over SLC?

Hi. To level out a section of a bathroom floor I poured SLC. Over 50" the slope was zero to about 1 1/4". My plan was to put Durock over this. Is this acceptable? I was planning to glue and screw it down.

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Unread 05-04-2012, 10:30 AM   #2
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Welcome, David.

I'd say not at all acceptable. Unless you can get someone from USG to bless the installation for you.

What is the plan after the Durock, which you're not gonna install? This to be a ceramic tile installation?

This was over a wood-framed subfloor? Did you determine the reason for that slope? That is a lot of slope to have without some sort of structural problem.

My opinion; worth price charged.
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Unread 05-04-2012, 10:34 AM   #3
dstehle
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yes, this is to be a ceramic tile installation. Any options, other than chopping out the SLC?

This is 200 year old house...plenty of slope everywhere, but it is stabilized. There is wood floor joists and old funky sheathing topped in spots with oak flooring. Plenty of rotten spots which I repaired with plywood.
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Unread 05-04-2012, 10:37 AM   #4
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Welcome to the forum, David.

As far as fastening the Durock with screws, you're likely to "volcano" some of the hard SLC material immediately around the screws as the screws try to coil their way down through, leaving you with a bump of material that will prevent the Durock from being embedded into the thinset flat. It's not advisable. Did you use primer on the plywood? Did your manufacturer recommend the use of any metal expanded or plastic lath? I'm trying to determine if you can tile directly over the SLC, but we'd want to understand more about the suitability of the joist structure and subfloor. Can you tell us more about them?

And by "glue and screw", do you mean thinset and screw...or using some sort of construction adhesive?

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Unread 05-04-2012, 10:44 AM   #5
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I see a few of us were typing at the same time...

I see you answered some of my questions. With the patchwork of flooring, I'd remove what you have and install plywood as your subfloor. Brittle tile doesn't like the slight movement that comes from solid wood underlayment and patchworks of support.

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Unread 05-04-2012, 10:46 AM   #6
dstehle
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"Volcano" - I thought I might drill it.

"primer" - yes, latex primer by SLC manufacturer - Levelquik. I didn't see any recommendation for laths.

"Glue" - PL400.
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Unread 05-04-2012, 10:48 AM   #7
dstehle
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Man...OK...so rip out SLC. Then...cut sleepers to correct the level, put down plywood, then durock, then tile? This will add quite a bit of height the the finished floor.
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Unread 05-04-2012, 11:48 AM   #8
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Can I tile directly on the SLC? Its rather thin on the left side.
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Unread 05-04-2012, 12:00 PM   #9
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I would have done the cementboard first per manufacturers
instructions and then did the SLC to take out the low area.

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Unread 05-04-2012, 01:47 PM   #10
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What about Ditra or DitraXL?
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Unread 05-04-2012, 03:25 PM   #11
dstehle
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I haven't used Ditra. Would the Ditra go right on the SLC?
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Unread 05-04-2012, 03:54 PM   #12
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I called Ditra and they were supportive of putting ditra over the Levelquick. I welcome any feedback.
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Unread 05-04-2012, 03:56 PM   #13
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David, is that sawn board subflooring we're seeing under the SLC?
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Unread 05-04-2012, 04:17 PM   #14
dstehle
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Over the floor joists is 7/8" planking, with 3/4" oak over that. There was a lot of rot where I put in plywood.

But in area where there is no SLC is the
oak.
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Unread 05-04-2012, 04:53 PM   #15
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Hate to be a wet blanket here, David, but I don't see a lotta hope for what you've got there.

The SLC manufacturer is not likely to bless that installation at all, for one thing. Never have known one who would permit installation over sawn board flooring at all and all the ones with which I'm familiar require reinforcement over wood-framed floors and have minimum thickness requirements.

That said, there is no other tiling substrate manufacturer who will indicate his product over sawn board flooring, either.

You really need to go back a couple steps here, I think.

The hardwood flooring must all be removed. That sort of flooring is installed to intentionally allow for movement. Tile installations don't like movement.

And you must then, if your subflooring is in good condition and well fastened, install a layer of plywood a minimum of 1/2" thick before installing any tiling substrate.

I think a better option would be to remove all the subflooring, too, sister on some new joists to bring the joist tops up to level (if you care about level) and in plane before installing a minimum of 3/4" plywood for your first subflooring layer.

I wouldn't recommend you continue with what you've got there.

My opinion; worth price charged.
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