Water UFH Cemfloor liquid screed with heating - Tile Advice

[Flintstone]

I thought I would put this on as these screeds are becoming increasingly popular and there seems to be incorrect advice been given by the screeders. Pumped in, rapid drying cement based screed with underfloor heating which they claim you can tile on directly after 7 days and you don’t need to sand, well you do need to sand as there is clearly laitance on the surface, I used a diamond cup to sand this but it can be sanded using a course abrasive paper as it’s much softer than anhydrite in my experience. This was left 28 days before I tiled it, and the underfloor heating was commissioned correctly. I fitted durabase mat as there’s going to be some extreme temperatures in this room and with the screed being new. Here’s the job, at a listed 16th century old vicarage in Derbyshire.


First picture shows the screed when first poured and the curing agent they spray on top, second pictures show the laitance, then it after sanding.

 

[LM]

I thought I would put this on as these screeds are becoming increasingly popular and there seems to be incorrect advice been given by the screeders. Pumped in, rapid drying cement based screed with underfloor heating which they claim you can tile on directly after 7 days and you don’t need to sand, well you do need to sand as there is clearly laitance on the surface, I used a diamond cup to sand this but it can be sanded using a course abrasive paper as it’s much softer than anhydrite in my experience. This was left 28 days before I tiled it, and the underfloor heating was commissioned correctly. I fitted durabase mat as there’s going to be some extreme temperatures in this room and with the screed being new. Here’s the job, at a listed 16th century old vicarage in Derbyshire.


First picture shows the screed when first poured and the curing agent they spray on top, second pictures show the laitance, then it after sanding.


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[LM]

Lovely job Andy. I really like the bond in the set out, it really does the tile justice

 

[Ajax123]

Nice to see the screed treated with common sense rather than blind faith that the screeders was giving good advice. If he said it could be tiled after 7 days and it didn' need sanding he was talking bull...

 

[Wishiwasatoptiler]

Looks a top job fella. Great info to. Cheers for sharing.

 

[LM]

@Localtiler, Andy what tile was used on that floor?

 

[Flintstone]

@LEE MAC i am not sure of the name of it, was supplied by the customer. Spanish porcelain

 

[TheAofT]

Real beauty...
Thanks for sharing a valuable info.

 

[Tile Shop]

Good Job Andy and good info about the screed too. Likey biggy muchly's

 

[hmtiling]

How flat/level was it Andy?

 

[Flintstone]

It was perfectly flat harry!

 

[Balloo]

I was supposed to start a 400m 1200x200 plank on 21st may on cem floor everything was good to go but botoment adhesive CO put a stop on the job said the floor needed 3week drying , and would need decoupling matt ,???? .
Its messed up my schedule really bad , but better safe than sorry I guess , ?

 

[Balloo]

Forgot to mention I was thinking of hiring a lawn roller to press down the matt because of how much there is , is this a good idea ?

 

[Flintstone]

Balloo, if the floor doesn’t have underfloor heating then you can tile it straight away if your fitting an ditra or dural.

 

[Balloo]

Has ufh