Screed Floor

[lotus]

Hi,

ive had a tiler tile my kitchen only to find after a week of being laid the tiles have lifted up, they havent taken to the floor (they sound hollow underneath), you can walk around the kitchen hearing them creek! i did mention to him before he started that it may need priming, but he said it would be ok. The house is a new build and the floor is a concrete screed flow floor finish. Should this have been primed by the tiler as a course of best practice, or is there another reason for this to have happened unrelated to the tiler, because it does need to be sorted and he's refusing to take the blame saying the screeders should have primed it.
:huh2:
Thanks in advance for your help.

 

[TMTservices]

hi matey.

On a fresh screed I always prime first, as they are nearly always dusty. If not primed then adhesive won't bond properly to screed. If not only to cover my own back.

Hollow sound may be a sign of spot fixing or it maybe that those particular tiles are loose already.

As for him saying that it should have already been primed? The people who lay the screed wernt to know what was going down. For example a carpet needs no primer so like I said it would have took tiler no time to prime, just in case.

Also find out what adhesive he used!

Sean

 

[kilty55]

i agree with sean as above..also you had to mention to him you thought it may need primed to which his reply was it will be okay? he cant turn round now and say the guys who screeded the floor should have primed it,,primer costs pennies and takes no time to apply,also sounds like hes not properly fixed your tiles if they sound hhollow there is most probably air gaps underneath them,

 

[Leatherface]

Hi mate, what kind of tiles were they ?
Ceramic ?
Porcelain ?
Stone ?

He could have also used incorrect adhesive ?
That said it is always best to prime a new concrete floor

 

[lotus]

Hi,
Thanks for your prompt reply.
It is an Anhyrdrite screed floor not a concrete floor, sorry. The adhesive used is called Rapid set. The tiles were ceramic floor tiles. Is it always best practice to use a floor primer?

 

[inspiredandy]

I always prime a screeded floor wether its new or old, it's just good practice. Just a thought, was the screed dry enough to tile onto. Moisture naturally comes to the surface during the drying out process making newly laid tiles seem to lift and sound hollow because you will get a certain amount of shrinkage in the screeed when it drys out. Hope this helps.

 

[murf]

anhydrite screed needs special attention before tiling.
By the sound of things youv'e got trouble on your hands.

 

[wetdec]

Yes it is isn't it............come on guys wake up :8:


It's going to need taking up and re-laying I'm affraid 🙁

The surface of anhydrite screeds need scarifying to get off the latence (the light powdery surface), then seal twice in opposite directions before using a cement based adhesive to relay the tiles.

There is an easier way using a dry lay membrane, simply lay the membrane over the area and tile directly onto it...............easier but it costs more obviously.

Not sure this helps but your fixer needs a kick in the a$$

..

 

[DHTiling]

Agree with wetdec.....gypsum flow screeds like that needs propper preparation prior to tiling....and personally i would use a fexible adhesive as well....


How old is the flow screed..?

 

[Leatherface]

Trouble is that there will be numerous tilers who do not know what an anhydrite screed is. Therefore treat it as normal.