D
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 .
Tiling over overfloor heating system - Wundafloor
O
Old Mod
Don’t spoil the party Jerry 🙂
H
hmtiling
Was going to until it was priced up. Very pricey on a large area
O
Old Mod
S
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
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
D
Dumbo
Looks like it delaminating to me .
S
Shinyshiny054
What is the solution to delaminating?
W
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.
S
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?
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?
W
WetSaw
You need to make sure the SLC is bonded to the substrate before you do anything else.
D
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 .
S
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
C
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!
S
Shinyshiny054
Three tilers: they were all fairly confident the cracks were only from heating too soon (wait two weeks min). Two tilers suggested decoupling mats, one didn’t. Said he had tiled over this system before and was happy with the flatness we had achieved from the level. Unfortunately the guy was also a total cowboy and the actual tiling job is rougher than a badgers bum, but that’s another story - literally, there’s a whole thread about it!
It’s been a little over two weeks since the job was completed and we switched on at the bare minimum last night. Will see how it goes and certainly plan to update findings here.
Good luck, it’s very stressful, I know!
Hi, Just been reading through this thread and was wondering how you got on?
I have bought a 50m2 kit from Wundafloor and will be laying it in the next few weeks, having spoken to Mapei and being assured that tiling directly onto the boards with Elastorapid has been tested by them and is fine.
Reading some of these threads is making me a nervous wreck, but I am curios to hear from someone who has installed the exact system to see how it worked out?
Also, what was the longest run for your tiles, did you have an expansion gap other than around the perimeter?
Cheers,
Nic
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Shinyshiny054
Hi Nic,
It’s absolutely fine so far, heats up the house really well. We had massive issues with a crap tiler and the screed we poured to level cracking but so far hasn’t transferred any issues to the tiles (although they look like they were laid by a 12 year old- again, another story).
We covered 8 meters with an expansion gap at around 5m where the floor changes from concrete slab to suspended floor in the extension.
Good luck, I was really worried about the whole thing too, it’s a lengthy process but well worth it.
Gill
I appreciate this is a few years later I’m just wondering how things went and was a flexible screed used and did he put down a coupling membrane? I’m planning on using the wunda system but the mrs wants tiles so I’m just nervous as I only have a timber floor so I don’t like the sound of a screed over it all plus seeing cracks :O
S
Seantwo
Don't mind me while I bump up some older but good threads. If you can contribute to the thread, go ahead. But if it's nothing for you then don't reply and it'll soon drop off the What's New page etc.
Worth linking to our new forum structure while I'm doing stuff:-
Worth linking to our new forum structure while I'm doing stuff:-
There are similar tiling threads here
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