Large floor - TilersForums.com

[J Sid]

that's the problem, the tradesmen we follow aren't what they used to be which means we have to use products and fixing method which in an ideal world shouldn't be needed.....

 

[One Day]

Stop moaning.

'tiler'll sort it'

 

[Dumbo]

even if the screed has been done well it's the underfloor heating that is going to cause the problems with the heating and cooling cycles and expansion and contraction of the screed

 

[Dumbo]

I did a 300sqm floor with royal mosa (quite expensive) onto heated anhydrite. Thankfully the customer saw the need to make sure it lasts so i got to do it properly. Otherwise, winging a job of that scale as a sole trader could see me lose my house!

Jcr tiling llp

 

[J Sid]

even if the screed has been done well it's the underfloor heating that is going to cause the problems with the heating and cooling cycles and expansion and contraction of the screed

its not the heating and cooling cycle in its self that's the problem, its the cracks it courses in a bad laid screed.

 

[Dumbo]

its not the heating and cooling cycle in its self that's the problem, its the cracks it courses in a bad laid screed.

As I said expansion and contraction . Cement with additives and fibres it's going to crack over that sort of area .

 

[J Sid]

it shouldn't crack all over the place. It shouldn't crack at all, if it does, its failed.

I've had tiles crack on a few occasions even with an uncoupling membrane, they aren't a cure all product.

 

[One Day]

I've never had any crack on Ditra - ever.
I've seen L cut tiles crack on ditra, but that's due to the stresses in the tile - not the floor.
As far as lateral movement I honestly believe Ditra (not others) to be as good a guarantee against cracks as you'll ever get - short of incorporating an old-fashioned sand layer into the floor.

 

[Dumbo]

So whenever a floor fails we just point the finger at the screeders .

 

[J Sid]

I've never had any crack on Ditra - ever.
I've seen L cut tiles crack on ditra, but that's due to the stresses in the tile - not the floor.
As far as lateral movement I honestly believe Ditra (not others) to be as good a guarantee against cracks as you'll ever get - short of incorporating an old-fashioned sand layer into the floor.

yes they were L cuts, but on removing tile and Ditra the screed had cracked in the same place as tile.