Anhydrite Screed

[peteablard]

are the tech bods from companies that don't do an anhydrite addy caus there bound to back there products asfor not been able to mop a floor what a load of tosh most floors dry due to evaporation especially with ufh
all the floors ive sceen that have failed have all been due to cement based adhesives.and the builders /tilers not knowing what there laying on. most see a flat floor and think this is gona be easy.
the problem with these floors there a back ward step as the drying times are so long just persuaded a builder to switch to a semi dry screed as his clients want to be in for end November told him that a 65mm anny screed wouldn't be ready till January at the earliest
I actually don't give a monkeys how people tile these floors all im saying is if it pops then the problem is yours and can be expensive

It's the second part of that statement that's the problem. I've heard of floors failing where a gypsum based adhesive was used but the floor hadn't been sanded or primed. If the prep is done right then there is no risk in my opinion. A mate of mine is subbing for a company and is now ripping up the 4th failed floor they've had, all done by different tilers. . Complete lack of knowledge on both sides has been costly for them

 

[mma]

I was picking up some adhesive this morning and I overhead the end of a conversation where the tiles have popped up. Floor hadn't been sanded and cement based adhesive had been used. Gonna be costly for somebody

 

[StevieBoy]

................. A mate of mine is subbing for a company and is now ripping up the 4th failed floor they've had, all done by different tilers. . Complete lack of knowledge on both sides has been costly for them

So that would suggest that the removal or sanding off of the laitence and priming are essential with the idea the primer forms a barrier between the adhesive and the screed

This thread could go on and on like the Sigma / Rubi debate lol.

 

[Ste-G]

Just putting the discussion of adhesive and primer aside for a moment. Does anyone know if the latency can be scraped of the day after the floor is poured. A builder I have a lot of respect for told me this is so, but every time I've fixed on one I've had to sand it.
Are the screeding companies not giving this information or is it just a case of f..k it let the tiler do it.

 

[StevieBoy]

Just putting the discussion of adhesive and primer aside for a moment. Does anyone know if the latency can be scraped of the day after the floor is poured. A builder I have a lot of respect for told me this is so, but every time I've fixed on one I've had to sand it.
Are the screeding companies not giving this information or is it just a case of f..k it let the tiler do it.

I'd be interested to know the answer to this - it may be possible, as I am on my second of four new builds, I went over to the fourth plot yesterday where the flow screed had been poured only a week ago. It looked wet, it wasn't obviously but I scraped a bit with my right foot and the laitence did actually come off.

On the other two plots that I have tiled, I would say 70% of it had actually wore off with all the other trades walking all over it, so I got down on my hands and knees, used a very sharp scraper and it all came off very easily indeed - so didn't need to sand it.

 

[Old Mod]

Maybe this thread will be of interest

Fixing to Calcium Sulphate Screed & drying times

 

[AD Ceramics]

Maybe this thread will be of interest

Fixing to Calcium Sulphate Screed & drying times

I've just read that thread Mark it seems to be in a different language mate

 

[Old Mod]

I've just read that thread Mark it seems to be in a different language mate

Didn't someone ask for a technical explanation Paul? Haha

 

[Just Rizzle]

Just putting the discussion of adhesive and primer aside for a moment. Does anyone know if the latency can be scraped of the day after the floor is poured. A builder I have a lot of respect for told me this is so, but every time I've fixed on one I've had to sand it.
Are the screeding companies not giving this information or is it just a case of f..k it let the tiler do it.

that's when its easiest to remove as ifs still soft and not baked to the floor done several floors like this when ive known from the builder when the floors going to be layed. the advantage of doing it early no dust.

 

[StevieBoy]

All sorted now then.

 

[widler]

Depends stevie, its been seen and priced, priced it using the correct adhesive as the customer had read and been told of people to use gypsum adhesive
Or so i heard

 

[Spare Tool]

Well after all this 'banter' the jobs off now, customer wouldn't wait even though offered to work a weekend so he could get his kitchen in by end of November..no pleasing some people!!

 

[Ste-G]

That's what Jesus said.

 

[Spare Tool]

That's what Jesus said.

Think he'd know the difference between gypsum n cement though

 

[Just Rizzle]

Think he'd know the difference between gypsum n cement though

bet the tiler he gets dosnt and it pops