Tiling over overfloor heating system - Wundafloor - Tile Advice

[Dumbo]

Are you sure you can get a 7mm rib from a 6mm trowel by holding it at 45degrees?

Sorry left out bit about 10mm . Brain working faster than fingers . So 10mm trowel at 45 degrees give vertical rib height of 7mm

 

[Dumbo]

Spoke to Tom Mathew a little while back he reckoned you were going to use some of that Norcross gear on a green screed . Did you if so how did you get on .

 

[Old Mod]

Don’t spoil the party Jerry

 

[hmtiling]

Spoke to Tom Mathew a little while back he reckoned you were going to use some of that Norcross gear on a green screed . Did you if so how did you get on .

Was going to until it was priced up. Very pricey on a large area

 

[Old Mod]

Was going to until it was priced up. Very pricey on a large area

Coeeee I am here you know Harry
This is not our thread it’s a clients

 

[Shinyshiny054]

Hi all,

Sorry just realised there were a number of extra comments which I never got notification for, so thanks for those! I hope you all had a relaxing festive break

We decided on a SLC compound after we found some variation in the levelnsss of the floor. This was poured in three sections over the aluminium boards which had been primed with Ultra Prime It. The screed we chose was Mapei Renovation Screed - so apparently not compatible with the primer (we’d already primed).

The trouble we have now is cracks appearing in the screed. They are hairline but there are a fair few across the whole floor (around 32m2). The screed was heated 3 days after the last pour starting at 15 degrees and increased by 5 per day to 45 where it is now.

Mapei can’t provide support due to the products used, so I’m looking for some advice on what we can do to remedy.

Is there anything we can do to fix the cracks? Any suggestion on the cause? What kind of problems could occur from tiling on cracked screed? Help! Photos attached - you can see there is a sink hole - we’ve ordered epoxy (Mapei epo rip) to fill, we were considering using it over the cracks to.

Any help much appreciated

Cheers

Gill

 

[Dumbo]

Looks like it delaminating to me .

 

[Shinyshiny054]

Looks like it delaminating to me .

What is the solution to delaminating?

 

[WetSaw]

Delaminating means it's not stuck to the substrate. If that's the case it will need to be removed. Have a go at gently removing a bit, where it's cracked all around would be a good place to try.

 

[Shinyshiny054]

Delaminating means it's not stuck to the substrate. If that's the case it will need to be removed. Have a go at gently removing a bit, where it's cracked all around would be a good place to try.[/QUOTE

We have epoxy to fill the cracks and sink holes and will take up any particularly bad sections, but what’s the best infill for those? Can we epoxy? Will it bond ok?

 

[Shinyshiny054]

Oops, screwed up the quotation function by inadvertently deleting a close bracket. Here’s what I meant to ask

We have epoxy to fill the cracks and sink holes and will take up any particularly bad sections, but what’s the best infill for those? Can we epoxy? Will it bond ok?

 

[WetSaw]

You need to make sure the SLC is bonded to the substrate before you do anything else.

 

[Dumbo]

Your floor looks like it is failing. I'm not on site so can't be sure but I think if you tile this you will be throwing good money after bad . There are issues why your floor has done this .

 

[Shinyshiny054]

So we have 4 tilers coming out to assess floor and quote. 2 so far: one is happy to tile over, the other will tile over with a decoupling membrane but both are certain the cracks are due to heating too soon. 2 down 2 tomorrow to go

 

[cicuuts]

Hi Gill, how did you get on with the various assessments? I'm about to go through the same process (having already bought the Wunda overfloor panels), so any advice would be much appreciated!