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Old 03-11-2010, 08:28 AM   #1
chrome777
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How do I raise a concrete floor?

Hello all,

I want to tile the floor in the basement, in the hallway outside of the bathroom is dri-core (about 7/8" thick) that will have engineered bamboo on it (3/4" thick) for a total of 1 5/8" thick

Now considering that if I tile directly on the concrete I am going to be shy by about 1 1/4" what is my best option for making them level?

Someone at Home Depot (grain of salt?) suggested I put down a vapour barrier (poly) then 2 layers of 5/8 plywood (criss cross fashion) PL adhesive'd together screwed down into the concrete with tapcon screws

I was thinking 1 layer of plywood then a 5/8 hardibacker mortared to it might be better (then tapcon the whole thing down or maybe just the plywood?), but not sure.

The concrete floor is pretty even and level btw.


Thanks for any input!
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Old 03-11-2010, 08:47 AM   #2
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Greetings Andrew,

I'd go with a mud bed.
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Old 03-11-2010, 08:56 AM   #3
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That thing the HD guy said, I saw that once on TV. I wondered about that. Instead of saying vapor barrier, I think they said just insulation. Now they are showing the same procedure with Ditra all the time.

Shawn, after the mud bed, this does not require a liquid membrane on it right? Or would we?
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Old 03-11-2010, 08:58 AM   #4
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That really doesnt sound enjoyable Shawn.. whats plan B?
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Old 03-11-2010, 09:20 AM   #5
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Welcome back, Andrew.

What Shawn said.

I don't think there is any reasonable Plan B for my dinero.

My opinion; worth price charged.
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Old 03-11-2010, 09:32 AM   #6
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thanks, and hello again cx



Sigh... can someone please point me in the direction of how to accomplish this? I had a look in the liberry... but it seems to have to do with showers mostly. Is it the same idea only level instead of sloped?
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Old 03-11-2010, 09:33 AM   #7
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What CX said about what Shawn said.

You want this to last, don't you?
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"the road to hell is paved with osb, mastic, pre-mixed latex 'grout' or 'thinset', "
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Old 03-11-2010, 09:35 AM   #8
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There's a thread in the Pro's Hangout called "Mud Course" or something like that. Do a search and click "Search By Posts" at the bottom.

Goes into lots of detail.

edit; and yes, like a big flat shower...... kinda.
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Old 03-11-2010, 09:53 AM   #9
chrome777
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Thanks dhagin,


Didnt find any "Mud course"


but I did find this:

http://www.johnbridge.com/vbulletin/...ead.php?t=1807

Looks promising.. any reason not to use a SLC?
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Old 03-11-2010, 10:03 AM   #10
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Cost of SLC = $$$$$ compared to mud. SLC can also be tricky & unforgiving in it's placement for a DIYer, tho many here have done it successfully. Mud floors have their own challanges......

How big is the floor?

http://www.johnbridge.com/vbulletin/...ght=mud+course
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Old 03-11-2010, 10:09 AM   #11
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The floor is quite small, 7' x 5'


raising it an inch should be < 3 cubic feet (2.92 I believe)
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Old 03-11-2010, 10:18 AM   #12
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I'd consider SLC for that floor. Not too much for an ambitious guy like yerself, I wouldn't think.

Keep it thin as possible, based on manufacturers requirements. Read, understand and follow all instructions precisely. Get a few helpers when you pour too.
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Old 03-11-2010, 10:54 AM   #13
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Cheers Dana, will do
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Old 03-11-2010, 10:55 AM   #14
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Verify that the SLC you choose is suitable for such a deep pour. You may need to do it in 2 or 3 pours.
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Old 03-11-2010, 01:17 PM   #15
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If it's your first time with SLC, a lot of folks here recommend Custom's LevelQuick ES which you can get from Home Depot on special order. I used it recently for my first SLC job and it worked great as long as you

1) Read the directions 10 times
2) do a search for SLC in thread titles here and read EVERY post ever written on the subject so you can see what happens when you don't follow the directions (!) and for hints on how to work the stuff
3) read the info in the Liberry about SLC
4) use the primer. USE THE PRIMER.

There is also a LevelQuick RS (rapid set) that is stock at home depot. DON'T use it; it sets too fast.

You can pour ES up to 2" thick according to the bag, but I would still recommend doing two or more pours anyway based on how it went for me.

And it will be VERY expensive to do this; I think a $32 bag of ES covers 50sf at 1/8" if I remember right. You'll have to do the math to figure out how much it's going to cost.

Good luck!

Edit: missed the size of your floor the first time...If I'm calculating it right you'd need 16 bags to get 1 1/4 inches but not sure about my calcs.
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