Problematic Anhyrdrite floor!

[Perfect Tiling]

Ajax...forgot to ask. Can this problem not be related to thermal shock due to the heating being turned on too high and too soon. The tiles under the toilet etc where there are no pipes are solid and a perimeter tile has cracked but is still sounding solid. Put this with the fact that the travertine tiles in the rest of the house are solid, leads back to the only tiles going loose are those that have had heat introduced. Floors were fine on Fri last week (I was on my knees siliconing) and thermostats were down at 10 and not calling for heat, today 5 days later they are at 20 with water going throught the manifold at around 45 degreesC. Customer moved in at the weekend so must have turned it up.

 

[Perfect Tiling]

Hi Mark. Thanks for the info. The wood floor is not stuck to the screed, it is an engineered oak floating floor. The tile I lifted was hard to get up and broke into 3 pieces the first part leaving the adhesive on the screed rather than on the tile. The tile had adhesive on it level with the high part of the pattern. Never doing screeds again...not worth the worry...hardibacker or wedi boards all the way!!!

 

[Perfect Tiling]

Mark. If company literature says not to sand then is this a get out clause for me if this is the problem????

 

[Ajax123]

Ajax...forgot to ask. Can this problem not be related to thermal shock due to the heating being turned on too high and too soon. The tiles under the toilet etc where there are no pipes are solid and a perimeter tile has cracked but is still sounding solid. Put this with the fact that the travertine tiles in the rest of the house are solid, leads back to the only tiles going loose are those that have had heat introduced. Floors were fine on Fri last week (I was on my knees siliconing) and thermostats were down at 10 and not calling for heat, today 5 days later they are at 20 with water going throught the manifold at around 45 degreesC. Customer moved in at the weekend so must have turned it up.

yes this is certainly a possibility. The timescales would suggest moisture. Thermal shock could easily be contributory. It s difficulties diagnose at a distance obviously.

Is the trav heated?

 

[Ajax123]

Mark. If company literature says not to sand then is this a get out clause for me if this is the problem????

Yes it would be a you have followed manufacturers guidelines. It does depend on wording though.

 

[Gazzer]

Hi Mark. Thanks for the info. The wood floor is not stuck to the screed, it is an engineered oak floating floor. The tile I lifted was hard to get up and broke into 3 pieces the first part leaving the adhesive on the screed rather than on the tile. The tile had adhesive on it level with the high part of the pattern. Never doing screeds again...not worth the worry...hardibacker or wedi boards all the way!!![/QUOTE]


Uh ?????

 

[Perfect Tiling]

Ajax. Literature says "the screed does not require grinding for subsequent floor coverings or vinyl application." Later on it also states "eliminates the need for subsequent grinding". Travertine floor will be heated but it is isolated just now so customer can't turn it on incase thermal shock is a cause.
Sir Ramic...what I meant was that if I do smaller rooms with flooring where I put down hardibacker or insulation boards for electric UFH I have never had a problem with loose tiles...ever. I could have made as much out of 4-5 standard rooms than what i get from this big job

 

[tommyzooom]

I recently lost a job, as I said it needed to be sanded, the screed Co. (Larsen) said it didn't. Homeowner was adament that it shouldn't be sanded, and implied I didn't know what I was talking about. I assume it has now been tiled on top of a heavy dusting of emulsion paint, as he had all the walls spray painted:mad2:

 

[Perfect Tiling]

Cheers Tommy...its a maze out there. This floor was nice and clean as it had been protected from paint etc. I knew about sanding but screed company and literature said not to...so I followed their instructions...printed ones so I have evidence I hope.

 

[DHTiling]

If the trav is solid and just the porcs came up after heating, then i think it is a strong possibility that it was heated to quickly.. if the heating was ran for 3 weeks then i doubt much moisture was left in the screed..

porcs will react a lot different to thermal shock than stone as porcs rely on polymers to hold the tiles where as stone with hold in the capillaries/structure of the stone backs.. so the thermal stress will make porcs pop easier if subjected to heat to fast as the adhesive would not be at full structural strength till at least 28 + days.

So don't be quick to blame moisture / sulphate delamination till you see how quick the floor was heated up.