Failed anhydrite floor

[Ajax123]

I'll bet it probably hasn't been sanded, I know that it's a rip out and redo. I'll just have to do it in room sized areas with some super duper vacuum equipment. She doesn't want any disruption this side of Christmas, I'll probably suggest going on holiday for a couple of weeks in Feb/March.

Lack of sanding would not mean a rip out and redo if the resin is such that it impregnates the top of the screed as it would replace the epoxy. Bit like sticking your tiles back down with araldite..

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Its a couple of miles outside of Grantham Alan, Barkston if you have heard of it. Thanks for the offer, I'll definitely take you up on that when I come to do the job.

Pyres I know barks ton. Only live down the a1 in Stamford myself so reasonably local.

 

[Mr Tiler]

bluddy hell bri not only do hey have to pay your extortionate prices but they have to go and pay for a holiday too lol

 

[Ian]

Lack of sanding would not mean a rip out and redo if the resin is such that it impregnates the top of the screed as it would replace the epoxy. Bit like sticking your tiles back down with araldite..

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Pyres I know barks ton. Only live down the a1 in Stamford myself so reasonably local.

I have spoken to the developer and he assures me that the floor was sanded but, it might not have been dry. He doesn't know what adhesive/primer was used. I'll need to investigate a little further before I choose a plan of action.

 

[Stef]

Keep us informed Bri as this will be interesting.

 

[Ian]

Keep us informed Bri as this will be interesting.

It'll probably be a few weeks before I get to look at it, end of Jan is the earliest. I'm very interested to see what's underneath, maybe the spot fixing method has been used :lol:

 

[Stef]

It'll probably be a few weeks before I get to look at it, end of Jan is the earliest. I'm very interested to see what's underneath, maybe the spot fixing method has been used :lol:

Probably.
What tiles are laid?

 

[Chalker]

It'll probably be a few weeks before I get to look at it, end of Jan is the earliest. I'm very interested to see what's underneath, maybe the spot fixing method has been used :lol:

Bet it's on spots too. For the grout to be falling out like your saying?

 

[The Legend; Phil Hobson RIP]

Hi Bri, I have been on and off a 150m2 floor ( not laid by me) Alan ( Ajax) may remember giving me advice on this one, Anhydrite screed not abraded, not primed, screed not dry when floor was laid.

I have been on and off this job for a few months, ripping up sections cleaning up tiles prep floor etc. Not good for the client, not good for the industry.

Lack of knowledge and research by fixers. We need to ask the questions, and then get advice from people like Ajax who have the answers.

 

[Ian]

Probably. 
What tiles are laid?

60x40 calibrated slate. The guy was clearly a good tiler, they are fitted to a high standard apart from them failing :lol: You know what I mean though.

 

[Ajax123]

No point speculating further till you have a proper look under the tiles.

 

[Lee@emctiles]

I went to look at a floor that had failed a couple of days ago and of the 60 m2, not much of it seems to be left attached to the screed. The grout is cracking and most tiles sound hollow. It's going to be a mammoth task sorting it out as the skirtings and kitchen are all fitted ontop. Now before I delve in and start pulling the place apart, what are people's thoughts on trying a resin injection to remedy the situation, is it worth a go? It wasn't me who tiled it originally so I'm not sure exactly why it's failed, my guess would be wrong prep or wrong adhesive, I won't know until I remove a couple of tiles. The lady has only been in the house 18 months and I want to cause as little disruption as possible, I feel quite sorry for her as she is quite clearly distressed about it.

Had a Thursday morning panic there for a minute until i read the whole thread!

 

[John Benton]

I've been tapped up by a neighbour on the job I'm working on now, same problem will start a new thread for it!!

 

[Ian]

I've been tapped up by a neighbour on the job I'm working on now, same problem will start a new thread for it!!

Just add to this one John, it'll keep all the info in the same place for future reference.

 

[John Benton]

Another floor failure

Was collared by a neighbour round the corner from the house where I'm working. Went to have a look at the floor in question.

The information I have so far is this:-

Anhydrite floor pumped over UFH.
Floor sanded.
Screed contractor leaves 'green' primer with builder.
UFH was not commissioned and not sure if a moisture test was done
1 mist coat applied 3 or 4 to 1 according to customer.
1 neat coat applied.
Floor tiles approx 70m, 60x60 polished porcelain fixed with cement addy 2mm joint (Not sure what manufacturer, BAL SPF found in garage but that was used in bathroom apparently)

After a few weeks the grout started cracking and tiles flexing.
Some tiles have been lifted and replaced (badly). They came up in one piece just with a chisel under one edge.
Contractor said it was an expansion problem so they raked out the grout and filled with silicon. This did not sort the problem.
They have done a moisture test but customer has not heard back yet.

Today I have looked at the floor and I would say that 50-60% of the tiles have a hollow sound when tapped.

Below are the pictures of the tiles that were loose and removed.

You can see that the tiles were not back buttered but this clearly is not the cause of the failure.

It looks like the primer has de-bonded from the floor but if anyone can throw anything else at this I would appreciate it. I have given the customer the good news i.e. the floor probably won't take long to remove, but I think he is prepared for it all to come up. Kitchen and skirtings are all installed on top as well.

 

[Chalker]

A feweople seem to be having problems with the green primer not adhering to substrate.

i personally have never tiled onto this type of floor but I fit a lot of underfloor heating for a builder with this type of screed. The liquid screed used is a dull finish when dry (no shiny finish like some).
this tiler has no probs with it. He makes sure its been tested and is dry , uses Dunlop adhesive ( not sure which one), vacuums the floor, NO primer, then just wets the floor with a sponge before adhesive.

i have worked for this builder and tiler for many years and to date have never seen one of his jobs fail.