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Old 04-29-2014, 09:25 AM   #1
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Re-tiling old bathroom floor


Good morning,
My husband and I were forced to replace our bathroom floor when we pulled out the old vanity and found the original contractor (house was built in 1970) did not tile the whole floor. They left about 1.5 square feet beneath the vanity unfinished. We have removed the old tile, but now of course have a very uneven surface (divits in the granite floor, old mesh left behind from the original tiles, some setting compound left behind) and as such I want to use SLC so I can retile. I know that on new subfloors before applying SLC you need to put down a primer. Do we have to do the same here on the old concrete floor?

Is there anything else we should be aware of when working with the SLC in regards to it leveling/adhering properly to the old floor?

Thank you.... :-)

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Old 04-29-2014, 10:55 AM   #2
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Re-tiling old bathroom floor


Yes,you need to prime the old floor before adding your SLC---

If the floor is concrete (you mentioned granite?) you might be better off using a grinder with a diamond cup and simply clean up the surface----but SLC will also give you a tileable surface.

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Old 04-29-2014, 11:19 AM   #3
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Re-tiling old bathroom floor


Thank you for the quick response.

Sorry...yes...it is concrete....but is not just a matter of cleaning up the surface...we have large divets in the concrete as well from removing the tile.....so this is why I assumed SLC was my best option....

One further question came to mind....I read another post from 2011 entittled 'Scared of Self Leveling Concrete' in which the advisor suggested foam sill-seal along the walls....do you advise the same? I have a small portion of two walls (again behind the old vanity) that were never tiled so I feel sil-seal should be used here....but the remainder of the walls are tiled to the 'floor'....is it necessary in for these areas as well?

Sorry...I realize these are somewhat basic quesitons but I have never worked with and SLC before...and I do appreciate the help!

Last edited by Franagrippina; 04-29-2014 at 11:22 AM. Reason: clarification
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Old 04-29-2014, 11:29 AM   #4
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Re-tiling old bathroom floor


SLC is very thin and watery---so the foam is used to keep the liquid from running under the walls--
I use a wax ring to protect the toilet drain from getting filled----

My 'go to ' brand of self leveler is Jifset---this one is mixed with liquid latex for the first coat and does not require priming---

However, all of them do a good job if you follow the directions---you need to work fast and help the product level out--it is not truly self leveling.
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Old 04-29-2014, 11:47 AM   #5
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Re-tiling old bathroom floor


Okay...a few more questions....

1. This is a very small room 57" x 59.25"...how much of the SLC will do the job?
2. You mentioned using latex in the first application, which gives me the impression it will take me more than just one. What is the curing time between applications?
3. How many applications do you normally do? Or is it a matter of enough to get the surface level.

This should be the end of the silly questions!

Again oh'Mike thank you so much for helping me clear up a few things!

Last edited by Franagrippina; 04-29-2014 at 11:57 AM. Reason: Updated request of info
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Old 04-29-2014, 11:53 AM   #6
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Re-tiling old bathroom floor


How thick?

The spread rate is on the bag---off hand, I just don't know---but some simple math will get you the answer--(or wait for Jazman--he has a remarkable memory for formulas and volumes---)Mike
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Old 04-29-2014, 11:59 AM   #7
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Re-tiling old bathroom floor


25 Lb. bag covers 27 sf --1/8" deep---
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Old 04-29-2014, 12:00 PM   #8
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Re-tiling old bathroom floor


LOL!! Of course! Sorry just new to this...I am looking at 1/8" coating (average)...hard to pin it down that way there are large divets our of the old concrete. (Well that is the goal anyway)!
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Old 04-29-2014, 12:01 PM   #9
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Re-tiling old bathroom floor


Okay...I think that is my answer....25 lb bag it is then....
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Old 04-29-2014, 12:07 PM   #10
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Re-tiling old bathroom floor


Best to have a spare bag on hand---just in case--use clean cold water---this stuff sets up fast so be prepared with a trowel --push it around and then let it level out---prime first---
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Old 04-29-2014, 12:18 PM   #11
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Re-tiling old bathroom floor


Thank you again for your help and timely responses!
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Old 05-13-2014, 06:42 PM   #12
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Re-tiling old bathroom floor


per you asking how much, just need to get it smooth and level.

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