Discuss SLC mistake on floor. in the DIY Tiling Advice area at TilersForums.com

NewbieTiler99

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Ok, before i start, I totally misread (as in missed!) the priming instructions on the Mapei 1210 SLC and didn't prime my floor before adding the SLC in my understairs toilet :(

Anyway, I poured the well and correctly mixed SLC over old black tile adhesive and everything thus far seems ok! The old adhesive was tested for Asbestos and came back positive but was in a good state, not tacky and very very thin.

It's been 72 hours since the pour and the SLC is sound and i haven't noticed any cracks or hollow sounds upon tapping. I know I've messed up but i wanted to know how long will it be before the floor fails, if it is to fail.

Thanks in advance!
 

pdc

Only a Handyman...
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Tilers' Arms Member
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3,577
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Mijas, Malaga, Spain
I wouldn't be losing any sleep over it, unless your understairs toilet is 100m2...
 
OP
NewbieTiler99

NewbieTiler99

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Messages
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Thanks for the feedback all. I'm going to leave it as long as possible before i tile the SLC to observe any cracks etc. Just to be on the safe side.

As an aside, if it does fail, can i remove any debris and simply overboard the floor? I wouldn't want to rip out all the SLC for fear of disturbing the bitumen.

Thanks
 

pdc

Only a Handyman...
Trusted Advisor
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Messages
3,577
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72 hours is more than long enough for it to dry, unless it's 150mm deep! Prime it, tile it, and enjoy it:mask:
 
W

Waluigi

Unregistered (Please Register)
Ok, before i start, I totally misread (as in missed!) the priming instructions on the Mapei 1210 SLC and didn't prime my floor before adding the SLC in my understairs toilet :(

Anyway, I poured the well and correctly mixed SLC over old black tile adhesive and everything thus far seems ok! The old adhesive was tested for Asbestos and came back positive but was in a good state, not tacky and very very thin.

It's been 72 hours since the pour and the SLC is sound and i haven't noticed any cracks or hollow sounds upon tapping. I know I've messed up but i wanted to know how long will it be before the floor fails, if it is to fail.

Thanks in advance!
You mention that you poured the SLC over ‘old black tile adhesive’ and that came back positive for asbestos. Was this Bitumin? And were the old tiles Marley style vinyl tiles?
 
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NewbieTiler99

NewbieTiler99

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Yes that's right. The asbestos report said Bitumous type product and the old tiles were thermoplastic. The tiles were removed however.
 
W

Waluigi

Unregistered (Please Register)
Understood.

Yes, standard primer wouldn’t have been enough anyway, it needed either a slurry coat of tile adhesive and SBR or Eco Prime Grip some people use.

It’s unlikely that the SLC will bond properly to the Bitumin and might fail after a few seasons.
 
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NewbieTiler99

NewbieTiler99

New to TilersForums.com
Messages
15
Location
South
Ah ok. Well as others have said, it's a relatively small area so if it does fail, it'll be annoying but nothing i can complain about due to my own mistakes!

I guess I'll cross that bridge if it comes to it and keep my fingers crossed in the meantime!
 
W

Waluigi

Unregistered (Please Register)
Ah ok. Well as others have said, it's a relatively small area so if it does fail, it'll be annoying but nothing i can complain about due to my own mistakes!

I guess I'll cross that bridge if it comes to it and keep my fingers crossed in the meantime!
No worries :thumbsup: I just thought I’d mention it for future reference.
 
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NewbieTiler99

NewbieTiler99

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I thought the black adhesive used way back when also contained Asbestos? Our report said it did? Or are you saying that the black adhesive would have been contaminated by the tiles?
 
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