Anhydrite not dry - Tile Advice

[White Room]

Whats an LL screed or have I missed somethink....

 

[kaharrison9]

So in theory could 85 rh be accepted if ditra is used as any moisture entrapment under a large format marble tile would not interfere with the screed as the ditra would form a physical barrier and I assume the moisture would then naturally come up and evaporate through the stone before it has been sealed.

 

[kaharrison9]

LL = Low laitance screed

 

[White Room]

Cheers matey....

 

[Ajax123]

So in theory could 85 rh be accepted if ditra is used as any moisture entrapment under a large format marble tile would not interfere with the screed as the ditra would form a physical barrier and I assume the moisture would then naturally come up and evaporate through the stone before it has been sealed.

No mate. If you use ditra over a wet screed the last thing you want is the moisture coming up through the stone as it will stain it. You would need to tape the ditra joints and let the mat do it's thing. In theory 85% would be fine but you need to find what you can stick it down with. Possibly gypfix, Anhyfix or one of the other stable of gypsum adhesives.

 

[Lee@emctiles]

Sounds an interesting project Kevin, Whats the gypix costing per bag?

Have you looked at TileMasters Anhyfix?

States this in the attached link
"Anhyfix can be applied to anhydrite/calcium sulphate screeds with 85% Relative Humidity (RH) or less. Anhyfix can be applied directly to anhydrite/calcium sulphate screeds"

[DLMURL="http://www.tiletown.co.uk/published/39/resources/documents/AnhyFixTechData.pdf"]Anhyfix Data Sheet [/DLMURL]

Anhyfix Technical Guide

 

[kaharrison9]

Hi Lee

Thanks for your response.

Have loosely heard of Tilemasters anhyfix but up to know have had no failures using the Gypfix and Ditra combination on anhydrites so am slightly reluctant to change also on this job I have purchased the adhesive and would be charged 30% restocking

I do have a 200 m2 coming up soon where the customer is sourcing the materials so there may be an opportunity there to try.

Looking at the data sheet obviously the 85rh level is appealing and I fully agree for reasons that a sanded screed should be primed something other gypsum manufactures sell as not necessary.

If okay to mention I pay around £23.00 per bag-is that near the anhyfix price also is it available locally?

Is there any issues adhering to uncoupling membranes?

Regards

Kevin

 

[Lee@emctiles]

Hi Kevin, Supplied Anhyfix to a few of the other forum tilers, judging by posts made re usability and performance i would say it was a great product.

For a 200m2 project, price would be sub £20 per bag.

Dont forget that TM also do a Anhydrite Leveller now as well. (AnhyLevel)

 

[Stef]

Both Anhyfix & Anhylevel are very good products.
Anhyfix stick like the proverbial.
Anhylevel is strange at first as it's a white slc & not the normal grey, it performs as well if not better than the other slc I have used.

 

[Lee@emctiles]

Both Anhyfix & Anhylevel are very good products.
Anhyfix stick like the proverbial.
Anhylevel is strange at first as it's a white slc & not the normal grey, it performs as well if not better than the other slc I have used.

So......you would definitely use TM Anhyfix again Stef?

 

[Stef]

So......you would definitely use TM Anhyfix again Stef?

Most defiantly Lee, it's a very good adhesive to use.
I need to try TileMasters other addys but no one stocks it up this way..