anhydrite floor screed

[Just Rizzle]

I disagree with dave no one these days should be mixing. theres plenty of products out there there that are compatable with the appropriate substrates. you wouldn't mix crossply tires with radials on your car, so why use cement based adhesives on anhydrite its a no brainer . like for like every time

 

[barno101]

Cheers for the info Dave ,, Ive got a meeting in the morning with both the plumber and tiler to get to the bottom of this ,,and I don't want to pass blame on any one of them ,but I need to get to a decision as to whether it is the floor being damp ,,or the heating being put on too quick too high temperature ,, at the end of the day the tiles have to be replaced and somebody has to pay for this ,,, if it was a small area say 20 to 30 m2 I would pay myself but this is a big area
Cheers

 

[Dave]

I disagree with dave no one these days should be mixing. theres plenty of products out there there that are compatable with the appropriate substrates. you wouldn't mix crossply tires with radials on your car, so why use cement based adhesives on anhydrite its a no brainer . like for like every time

Can I ask what you used before gypsum adhesives ray ?


yes I agree with gypsum to gypsum now we have the choice , just your statement on cement based adhesives was incorrect. Imo ..

 

[barno101]

Just an update ,,
Had a meeting with Tiler and Plumber ,and after a few strong words from all parties involved ,,we came to a decision, that they were both at fault and we have decided to ,,all of us put it right and retile the area ...
Tiler for not checking dampness ,, plumber for whacking the heating on to high ( and leaving it on for 5 days )..
Thanks again for all your comments

 

[Stef]

Glad you got a satisfactory outcome & the plumber & tiler have learned something new..

 

[Time's Ran Out]

Now I've read through this thread I cannot for the life of me see how the tiler was to blame at all!
If the floor wasn't commissioned by the plumber before tiling and he 'whacked' it on for 5 days the plumber is at fault.
These jobs should all be signed off at all stages and not just the cursory - yes it's been switched on/ off that have no records to pass to the next trade.
When the floor has been handed to the tiler it should have a full history ! How many times do we turn up and get told ' oh it's been down months'.
Had a floor a couple of years ago that was reading 32degrees in the middle and 12 degrees at the walls - what does that say about the zonal layout of his pipe work and how are we to tell under 80mm of screed!
I make it a point in my invoice now to tell the end user that the floor must be turned up slowly - but what guarantees do we have that it's followed.

 

[Just Rizzle]

the tilers fault is
a) he didn't take a moisture reading from the floor to ensure it was safe to tile and
b) tiling the floor befor the heating system was commissioned.

the best peace of kit I have is a moisture reader. cost over £300 about 12 years ago its made by sovereign it gives me peace of mind as well as my clients knowing in tiling a substrate its dry and safe to do so.

good luck barno101
hope all goes well this time but one thing what addy will your tiler be using this time round?

 

[widler]

I bet plumber said it didn't need turning on, most the time they have to go out of there way to connect it up.
Plumber on my job at mo said "why, it will only move again when we turn it on again when it's tiled, complete waste of time, I've never heard owt as daft in my life"
I still made him turn iton though [emoji41]

 

[Dave]

Common practise when testing an anhydrite screed for RH% is a Hair-hygrometer (original) or (digital) or the carbide bomb test.

how many of you guys have a hair-hygrometer ?

 

[Ian]

I've got 2 digital ones, set into foam blocks.

 

[peteablard]

Digital for me too, it's a F Ball one think it was about £100

 

[Stef]

Digital for me too.
Could do with another one..

 

[Sean SML Tiling]

I got the digital f ball and small digital tester which is not quit as good. Had to buy 1 for my anhydrite floor. Best 100 I spent

 

[White Room]

I've never seen one of these screeds let alone tiled one....

 

[Ian]

Everywhere round here Mark, went to see another failed one today, in an ex show home for a very well known national builder.