Ditra on Anhydrite

[Ajax123]

Gypfix is 3 -4 hours

i beleive most of the gypsum adhesives are 3 - 4 hours. H40 ideal is a standard set.

 

[DHTiling]

i beleive most of the gypsum adhesives are 3 - 4 hours. H40 ideal is a standard set.

Powdered dispersion adhesive :lol:

 

[Ajax123]

is there a rapid set gypsum adhesive?, I've always used rapid set for ditra/uncouplers just for the reason that if you need to pull a tile your're not going to pull the mat up too. I remember Dave having issues with, I think, kerakoll addy and uncoupling mat.

You raise an interesting point about if you have to pull up a tile. I shall have a think about that.

 

[Mark S]

Well as usual there is 50-50 split on opinion.
Like most aspects of this industry it often comes down to personal preference, cement based, gypsum based. As for the question re Kerakoll sticking to the Ditra, I believe so, but in all cases seek advice from each manufacturer.
As Ajax correctly mentioned, us 'binder' manufacturers are at times the piggy in the middle. We will always endeavour to assist in specifications and guidelines re anhydrite based screeds, and the correct preparation prior to tiling or other floor finishes.
I also agree there appears to be a heavily 'loaded' price structure for non cement based adhesives, would love to be able to answer that one.

 

[kaharrison9]

One of the big issues with anhydrite and possible failure is the moisture content in the screed.

I commission the UFH and check the content with a £100 digital hygrometer before i start.

Is it not possible as a customer care selling point that the the screed manufacture who know the screeds inside out and have the most espensive and up to date equipment and hygrometers can not do a pre test before tiling commences.

Better that they are there before rather than later saying the screed was not ready.

A gyvlon screed i've 120m2 to tile is going down shortly and to have that back up would be a massive plus with all the other issues of wet UFH and anhydrites.

 

[Gazzer]

When you consider that the screeders lay these screeds every day where as we the tilers lay onto them every few months ( well for me anyway) it makes more sense for them to have the test equipment and for them to sign the floor off as suitable for a floor finish such as tile.
Yes I do have the hygrometer but how much can you charge for continually driving over 20 miles both ways , setting up the hygrometer, letting acclimatise, then switching on then going back next day to take a reading ? And how many times would this need doing ?

 

[kaharrison9]

In full agreement.

We all (screed manufactures,screeders,tilers)have one goal and that is a successfull instalation and i see that if somebody in that link has better knowledge,equipment,etc why not apply it from start to finish and work together.

 

[White Room]

I've said this before but if any new product is produced why not work with adhesive companys or relevent companys to the process at the time to avoid a ton of questions to get it right to the fixer/applicator....sorry guys but it ai'nt rocket science.

 

[Ajax123]

I've said this before but if any new product is produced why not work with adhesive companys or relevent companys to the process at the time to avoid a ton of questions to get it right to the fixer/applicator....sorry guys but it ai'nt rocket science.

Its not new and I am 🙂

 

[Ajax123]

One of the big issues with anhydrite and possible failure is the moisture content in the screed.

I commission the UFH and check the content with a £100 digital hygrometer before i start.

Is it not possible as a customer care selling point that the the screed manufacture who know the screeds inside out and have the most espensive and up to date equipment and hygrometers can not do a pre test before tiling commences.

Better that they are there before rather than later saying the screed was not ready.

A gyvlon screed i've 120m2 to tile is going down shortly and to have that back up would be a massive plus with all the other issues of wet UFH and anhydrites.

Ive yet to see a screed manufacturer with the most expensive and up to date equipment for anything let alone moisture testing. 🙂 many readymix plants in the uk are from per war era when all airfields had a concrete plant on site. Some are obviously newer but not many in the general scheme of things.