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Old 06-03-2008, 08:52 AM   #1
BlueCanyon
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How to build up concrete slab 1 inch?

We are on our final tile project as part of a 5 year (!) makeover, and we're stumped on how to proceed.

When the house was built, they poured the concrete footing and then came back later and filled in the slab. However, on the one end of the room (the part we want to tile), the concrete slopes down and ends up about 1 inch lower than the footing. (DH thinks they ran out of concrete and were too lazy/cheap to call for more.)

What we want to do is lay a 2-3 foot wide perimeter of tile starting at the back door, follow the wall about 6 feet and then angle the tile across the corner and put the pellet stove on top of it. The rest of this room will be carpet.

So we need to build up the slab to meet the footing. (We'll put a soft joint where the slab and footing meet.) What are our options? From what I've read on forum, SLC is not an option due to the 1" thickness and the expense.

Can we build up the floor using deck mud (like what we used on the floors of our kerdi showers)? Is that too large of an area to use deck mud?

Thanks for all suggestions. I've attached pichers, in case they are helpful.

Mary Ann
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Old 06-03-2008, 09:00 AM   #2
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Mary Ann, deck mud is exactly what's needed here. Bond it to the slab with a slurry of thinset. Deck mud can't be feathered out, so use thinset to finish.

You're sure that the area didn't settle?
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Old 06-03-2008, 09:05 AM   #3
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Thanks BBCamp! What a speedy reply.

DH was wondering how to get that ol' deck mud feathered out - thinset on top - got it. Do we wait for the deck mud to dry before finishing with the thinset? And is versabond ok for both under and over?

DH is sure it didn't settle. Somehow he could tell, and he seems certain. (Settling was our first thought.)

Mary Ann
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Old 06-03-2008, 11:00 AM   #4
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Versabond will be fine for both the slurry and feathering. If you can feather without disturbing your new mud, that's fine. However, I think you'll be too busy placing the deck mud to worry about the feathering at the same time. Besides, that'll make three different cement products (thinset slurry, deck mud and thinset) going at the same time. Something will set up while you aren't looking.
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Old 06-03-2008, 12:04 PM   #5
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I have never seen something like that lower by an inch on purpose.

what was the prior floor finish ?
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Old 06-03-2008, 12:51 PM   #6
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Concrete Brian.
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Old 06-03-2008, 03:25 PM   #7
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that makes sense
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Old 06-09-2008, 12:25 PM   #8
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I think we are now ready to build up our floor using the deck mud. I tried to use the deck mud calculator in the liberry, but can't figure out a way to make it calculate for what I want to do.

We have 75-80 square feet that needs to be about 1" thick of deck mud. Can you tell me how much of each deck mud ingredient I need?

Many thanks - Mary Ann
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Old 06-09-2008, 03:11 PM   #9
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Depends upon what ingredients you're fixin' to use, Mary Ann. The math is pretty straight-forward for a flat area. In your case you need about 7 cubic feet of your final mix, right? So you need that much sand and 1/5th that much Portland. There's a cubic foot of Portland in a standard 94lb bag.

If you're gonna use other bagged materials, you can use the formula in the Liberry. You'll find it inna Shower Construction section.

Mix more than you think you'll need.

My opinion; worth price charged.
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Old 06-09-2008, 03:29 PM   #10
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Mary Ann, here is the mud calc.

just pay attention to the pre-slope specs- nothing else

I figured it at 80 sq/ft @ 1"

specs in calc are 10'x8' in inches for the pre-slope

of course you will need the thin-set of choice to make the slurry and to feather

looks like a two person job (or more) I am gett'n older ya know.
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Old 06-09-2008, 07:43 PM   #11
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Hi Mary Ann. I would start by making a screed around the walls and getting them level. Pack the mud as you go, then mud between the screeds as you back out. Apply the thinset to the slab just before the mud goes down. You don't want the thinset to dry before putting the mud over it.
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Old 06-09-2008, 10:27 PM   #12
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Davy,

you doing mud work in your good K Swiss sneaks again ?
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Old 06-10-2008, 11:46 AM   #13
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You guys are all THE BEST! Thanks a million.

Mary Ann
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