Tiling to calcium screed tiling - Tiles now lifting - Tile Advice

royalkal · Feb 9, 2017

hi everyone I'm a tiler with 27 years experience
not been on here for years but I have a question if you tile an calcium hanhidright screed and in 6 months they all come loose who is to blame ? the client said the screed was dry so top was sanded of then primed 3 times with acrylic primer then used single part flexible I also put expansion joints under all doorways and perimeter all materials were supplied by client

hmtiling · Feb 9, 2017

In a nutshell, I'm sorry to say, it's you.
You should have tested the floor or have someone else test it for you.

hmtiling · Feb 9, 2017

That's assuming the failure is down to a wet screed

hmtiling · Feb 9, 2017

Is this hypothetical?

Ajax123 · Feb 9, 2017

hmtiling said:
In a nutshell, I'm sorry to say, it's you.
You should have tested the floor or have someone else test it for you.

well actually that's not exactly right. If the client has declared the screed dry whilst it would be foolhardy to take the word of a client you have to take them at their word. Provided you could demonstrate that you have applied due diligence i.e. you asked them if it is dry then that would probably satisfy a court. If you went ahead and tiled either knowing it was not dry or if you didn't make a reasonable attempt to find out if it is then its probably not your fault... its a difficult one though...

peteablard · Feb 9, 2017

3 coats of primer isn't enough. When I've tiled anhydrite with a cement based adhesive its taken 6-7 coats mixed at 4:1. I'd say the correct procedure hasn't been followed

Ajax123 · Feb 9, 2017

peteablard said:
3 coats of primer isn't enough. When I've tiled anhydrite with a cement based adhesive its taken 6-7 coats mixed at 4:1. I'd say the correct procedure hasn't been followed

depends on the primer. bal apd and ardex P51 only need 2coats. if you are putting on 6 or 7 coats at 4:1 you are putting a lot of water back on the screed. you would need to leave it a while to dry... probably 24hours minimum.

hmtiling · Feb 9, 2017

Due dilie

Ajax123 said:
well actually that's not exactly right. If the client has declared the screed dry whilst it would be foolhardy to take the word of a client you have to take them at their word. Provided you could demonstrate that you have applied due diligence i.e. you asked them if it is dry then that would probably satisfy a court. If you went ahead and tiled either knowing it was not dry or if you didn't make a reasonable attempt to find out if it is then its probably not your fault... its a difficult one though...

Due diligence,for me,would include testing the screed. But,obviously, I'm no lawyer.

peteablard · Feb 9, 2017

Used P51 on my first ever one and was told by Ardex to apply it until it wouldn't take any more. The same was advised with PR360. Several years down the line they are still solid so would always do it that way. That said, the builder who always uses anhydrite and insisted and a cement based adhesive has now let me switch to anhyfix which makes things easier

Ajax123 · Feb 9, 2017

hmtiling said:
Due dilie
Due diligence,for me,would include testing the screed. But,obviously, I'm no lawyer.

As I say ... it would be a tricky one.

Tiling to calcium screed tiling - Tiles now lifting - Tile Advice

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