What primer and adhesive - underfloor calcium sulphate

[One Day]

you better hope your floor is mirror-flat if you fix unbonded!

 

[One Day]

In 12 years of tiling and my fair share of calcium-sulphate screeds, how many would I say were suitable for an unbonded installation?
1 or 2 at the most.

 

[Dumbo]

Me and harry would be ok we have a quality screed installer down here . Each one is bang on . As regards moisture it says 1.5 %cm I expect that's the same as by volume . Just wonder what it is rh as that is what most of us will measure by .

 

[Old Mod]

Just wonder what it is rh as that is what most of us will measure by .

Below 75% RH or 85% with Anhyfix.

 

[judge]

Me and harry would be ok we have a quality screed installer down here . Each one is bang on . As regards moisture it says 1.5 %cm I expect that's the same as by volume . Just wonder what it is rh as that is what most of us will measure by .

I asked the bal rep what rh is acceptable for the flex one when I met them at my local topps to which he replied he wasn't sure.he said he would get back to me (about five weeks ago) .even though it's been tried and tested on the continent for the last ten years(I think) ?I'm still a little optimistic about it

 

[Dumbo]

Below 75% RH or 85% with Anhyfix.

That's not really the answer . I think schluter say 2%by volume with a cement based adhesive and I've never been able to find out what that is as a rh figure .

 

[Old Mod]

Ok then there’s only one solution to your question.

@Ajax123

 

[hmtiling]

That's not really the answer . I think schluter say 2%by volume with a cement based adhesive and I've never been able to find out what that is as a rh figure .

Rh changes with ambient temperature. It's a little confusing to me. Not the hardest thing to achieve

 

[Just Rizzle]

ive never used and will never use any cement based adhesive on a anhydrite floor.i must of done 50 plus floors which are anhydrite based, i always use tile masters anhyfix.to ether fix tiles or decoupling mat once mat is laid you can use a cement based adhesive

 

[Dumbo]

ive never used and will never use any cement based adhesive on a anhydrite floor.i must of done 50 plus floors which are anhydrite based, i always use tile masters anhyfix.to ether fix tiles or decoupling mat once mat is laid you can use a cement based adhesive

I did an alpha hemi hydrate screed where I had to put a cut tile until the next stage of work was completed . When I had to remove said tile to continue tiling , it didn't want to come up , it was well bonded to the screed and that was done with a cement based adhesive .