Latex Cracking

Some parts of my concrete floor were not very level so I have used some of the mapei latexplan trade, but in one area it has cracked so I have ripped it up. The substrate is an area where old meets new and the old cavity has been filled.

Any suggestions how to get over this so I can latex again?

Pics for clarity



Also this one keeps stealing the brush and jumping on me but I guess there is no solution to that lol

That is a very cute dog.

Did the SLC crack from the left of the pic to the right?

The cracking was more from the centre, I think the old filled in cavity where it meets the other 2 concrete floors was the worst area.

Carpo

How deep did you go with it..?

It might be worth running a grinder along where the 2 substrates meet to give you a movement joint. Did the crack look like it followed the line of where the 2 materials meet? How long was the laytex down for before it cracked? was the floor primed before using the SLC?

Sorry for the thousand questions.

Thanks for the quick replies guys.

The deepest places it has gone on at 15mm, the cracks seem to come from the centre and out in all directions. I didn't use a primer. Latex has been down a week but not sure when it cracked as I have been away all week and noticed today when I was about to continue tiling.

You think using a primer and putting it on in thinner layers would be better?

Carpo

The subfloor looks contaminated.. i would have used a slurry coat over that first..or mapei Sp primer.

Latex plan trade also is designed for upto 10mm in thickness for each layer.. 15mm is a bit deep for one pour.

Ok, so I have some concrete based SLC that I got from B&Q I could mix a small amount up nice and sloppy and put some of that down, and then when dry build up the other layers with latexplan trade.

Or do you think I should go out and buy some primer, I have a TileGiant and a Topps tiles near by, but not sure if they have the SP primer in stock, nothing on their web site about it?

Carpo

I went with the slurry mix in the end, couldn't get to the shop as had the flipping mutt all day causing chaos. So I have now laid a 5mm layer of latex and will go over again tomorrow to build it up.

I have a question about the spiked roller, when is the best time to use it? should I wait until the latex has settled and after it has been spread about with the trowel.

Carpo

Spiked rollers are great for vinyl layers etc but not really needed when fixing hard flooring like tiles..

A few air bubbles won't hurt tiles..

Originally Posted by Dave

Spiked rollers are great for vinyl layers etc but not really needed when fixing hard flooring like tiles..

A few air bubbles won't hurt tiles..

lol, I got one because I thought it would help the self levelling compound self level, but it doesn't

Fingers crossed it will look ok in the morning

No they don't ..LOL

You need to spread it about..