Latex Cracking

[carpo]

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

 

[Rich]

That is a very cute dog.

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

 

[carpo]

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

 

[DHTiling]

How deep did you go with it..?

 

[Rich]

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.

 

[carpo]

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

 

[DHTiling]

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.

 

[carpo]

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

 

[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

 

[DHTiling]

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: