Decoupler and anhydrite

[Ajax123]

Any chance of doin a course up in sunny Ayrshire? ha. i would like to attend a course on this especially if its goin to get more common as a screed.I take it anhydrite will not crack if you force dry it then? would a dehumidifier also help? need all the info i can get so i can show him this tomorrow.

Force drying is actually a recommendation. Take a look at some of the tech data sheets at Lafarge Gyvlon Anhydrite based Calcium Sulphate Flowing Screed. That would help you a bit. The one on drying a gyvlon screed section 3 gives you the procedure but alter it slightly so that you maintain the highest temperature for 7 days instead of just three. No reason to expect it to crack.

 

[Stef]

Cheers folks, if i show him all this then maybe he will realise that its a good idea to wait.

"ALL GOOD THINGS COME TO THOSE WHO WAIT"

 

[Ajax123]

Cheers folks, if i show him all this then maybe he will realise that its a good idea to wait."ALL GOOD THINGS COME TO THOSE WHO WAIT"

If he don't listen put him in touch with me and I shall talk him through it as a suppliers technical manager

 

[Stef]

these were the two floors we tiled over anhydrite screed, the boss wouldnt wait, he knows we are going to be back to sort them but he just wants the clients moved in & then deal with snagging in a couple of months.:mad2: we ended up just using a flexi concrete adhesive in the hope it would delaminate the adhesive from the screed & hopefully delaminate the adhesive from the tiles, we did a test patch & it lifted off the screed but adhesive is solid on the back of the tiles, the boss will just have to go back to porcelanosa & buy more of the same.

Good news is though the next conversion wont be ready for us to tile until the end of November & they are pumping the screed in next week so they are learning, slowly.

 

[White Room]

Client moved in and doing snagging, thats going to be a nightmare..

 

[Stef]

Client moved in and doing snagging, thats going to be a nightmare..

Tell me about it, its not really snagging though ripping up 2 floors to stick them back down. "CRAZY"
The boss is just looking at the £500 large in his bank account.

The joiners are fitting an engineered wood flooring tomorrow (floating over the screed, with all that moisture still in)
We wont be the only 1's doing snagging

 

[Ajax123]

As long as it does not bounce back on your pocket Robson. I can guarantee that given what you have done here the adhesive will not stick to the screed for more than a few weeks. It usually becomes noticeable after a couple of months when the grout starts to crack and break up. If you primed the odds are that new tiles will be needed. If you didn't prime the screed may have dried the addy before it had time to grab the back of the tile and it will come off here as well. You never know eh!

 

[Stone]

Hi there,
I was just reading this thread and found it interesting.
Are you saying that anhydride screeds should not be put into wet areas?

 

[Dan]

Just bumping some of the older popular (sometimes not so popular) threads. Probably wont be current discussion these days but I just need to do it. So just ignore the thread if it's not current for you.