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Old 02-26-2009, 12:49 PM   #16
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Underlayment for tiling over stained concrete?


"what do you guys think about kristen using hardi-backer as tile underlayment along w/LOTS of conc screws ? ? ? we use it for installing seamless conc flooring over conc or wood AFTER jnt/crk treatments sometimes incorporating expand'd wire mesh."

Well, if you used HardieBacker, it really needs to be set in thinset. So, OK, let's say you don't...then you'll need almost 1000 tapcon screws for about 36 3'x5' boards screwed every 8 inches or so. Whew! More work than needed IMO and at what cost? HB is about $1 per sq ft...plus doesn't give you any flexibility where you need it.

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Old 02-26-2009, 02:19 PM   #17
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Underlayment for tiling over stained concrete?


You might want to look into two products: Mapei's " Mapelastic" and Mer-Kote's "Mer-Krete™ Fracture-Guard 5000". Both these are paintable antifracture membranes over which you can then tile.

Trouble is both require, again, that the slab be free of paints and sealants...the fact remains that tile has to be set in cementitious products and these need something to bite into and to be bond-breaker free.
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Old 02-26-2009, 03:49 PM   #18
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Underlayment for tiling over stained concrete?


Okay, I have resigned myself to the job of clearing off the sealer and stain.

I googled the Mapei Mapelastic and Mer-Kote Mer-Krete fracture guard 5000. The Mapei product might be available at Lowe's, but couldn't find either product available anywhere on a google shopping search.

If I can get the Mapei product, can you tell me how much coverage I'll get with one fifty (51?) lb bag? The Lowe's link I found didn't have that info, and the page wouldn't load when checking my area for availability. I'll try again later.

Where is the best place to buy these products? I'm in So. Cal. Either one would be applied to the entire area, correct?

Home Depot carries FlexBond, as well as RedGard anti-fracture membrane. It's in a bucket? Both products from Custom Building. I saw an article that discussed spraying on the RedGard, but didn't read it. Should I?

Last edited by kristen4hair; 02-26-2009 at 04:05 PM. Reason: more products
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Old 02-26-2009, 05:37 PM   #19
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Underlayment for tiling over stained concrete?


Besides being like creamy peanut butter, 'Mapelastic' comes in an everso pleasant shade of sky blue. So it comes it pails and is trowelable. Smells a bit tho'. The MerKote product is out of Denver so should be available at a tile shop near you, probably not at big Box stores - too specialized. Look up tile suppliers and give them a call. Or go to their website and search for a dealer in your zip code.

Look into that 'RedGuard' too, it sort-of does the same thing. In the lower half of your country, such products are used more than they could be up here for weather reasons. So, I'm not an authority on them by a far cry.

On the plus side is that you may have applied a "topical" sealer, ie one that sits on the top of the stain and not one that gets absorbed into the concrete. If it's an acrylic, then removing wouldn't be much of a sweat. On the other hand the stain may have sunken into the concrete and thus removing a top 'layer' would do. Who knows, the Behr product may be of such a quality that it just grinds off.

And yes either product is trowelled on - but it's a DIY project that may take you a bit of time. Don't know about spraying RedGuard, sorry. Anti-fracture membranes absorb some of the horizontal, lateral forces that concrete slabs undergo in different climates. They will do nothing for up-and-down, vertical cracks as when a part subsides a little into the ground. So all these 3 products are somewhat flexible. Have to be. And are therefore like insurance policies, there when you need them.

Then there's a peel-and-stick membrane called "ProtectoWrap". Google them and read up on it. A bit cheaper than Ditra but does the same thing.

But whether you need anyone of these products or not is again a function of your tolerance to cracks. You could well not put a membrane down and have a perfect floor for as long as you're in the house...so remember that tiles can be put on clean concrete just with thinset and no membrane - but you run a risk. Up to you to establish the risk level you are willing to accept.

Hope this helps.
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Old 02-26-2009, 07:42 PM   #20
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Underlayment for tiling over stained concrete?


Very helpful! Thanks so much. I think I might have about a thousand more questions real soon...but this should keep me occupied for a while.
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Old 12-19-2012, 12:21 AM   #21
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Underlayment for tiling over stained concrete?


I used Berh floor also, solid color, looked really good once it dried, but it soaks in everything, I did everythinglike the directions said, called the company and all, well, started to pull the paper off the walls that i was using t protect the walls, and it stripped the paint off the floor, most places regular tape removes it, others Gorilla tape pulled it off clean but kinda time consuming and pricy to use that tape to clean the floor off, lol but yes I lost all hope for Berh on that one, now I have concrete stined floors that look worse then the clay dirt outside, really it looks cleaner out side then inside, I am a military spouse, homeschooling two kids wiht Autism, so cant afford to do anything for the floor at all right now. the only way my floor will be getting done is if God puts it on someones heart to help out, or we win the lottery ....anyway, Good luck, always do your research, and God Bless. Merry Christmas.


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Originally Posted by kristen4hair View Post
Yes, I really want to do the job right so we don't have "failures" later...or sooner. It looks like it would be best to find some way to expand our budget so we can get decent materials. If we can take care of the installation ourselves, the investment will be well worth it.

The neighborhood and house value don't warrant going all out, and we're not here permanently, so resale is a big consideration when choosing what to use for floors, cabinets, etc.... When we were house shopping, the amount of mickey mouse DIY projects we saw was staggering. Such a turn-off!

So...I will check out the more specialized tile stores in my area, grind out the @#$%! stain I applied, definitely use a membrane of some sort, and ignore the apron guy.

Just a note about the behr sealer...after 3 coats-24 hrs in between-1 week later-stuff that got on the floor soaked right in and left spots that won't come out. I did everything by manufacturers instructions. Also had some bubbling that just peeled right off. I grinded, scrubbed, rinsed, rinsed again, primered, and waited longer than minimum drying time in between all the coats. So frustrating! But I'm done with that. Live and learn...
And listen to the pros!!!!!

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