1st Anhydrite screed ?

[Ajax123]

If there is a failure, and the rep comes out, remember to say "YES, of course I sanded it...."

It ain't difficult to tell mate...

 

[jonnyc]

Alan sorry to butt in on this thread , but interesting.
i spoke to you the other day about an anhydriite screed I am due to lay on next week.
i sent the the contractor two f.ball hygrometer units and they are reading 92 rh.
i was surprised by this a s I had been informed the screed had been heated for a month but I now find today that the boiler not in and it is just hooked up to a small heater I think .
do you know a company that can supply and install a temporary heat to get this floor dry by Tuesday.
job is in Norfolk and a very prestigious job and delay would have big implications .
any help would be much appreciated .
i don't think if present system in place reading will get down to acceptable in next five days.

 

[beanz]

It ain't difficult to tell mate...

I knew you'd bite hehe!

 

[jonnyc]

Ajax (Alan) is your man for this.
If he sees this then he will prob give you the advice but as far as I know all gypsum based screeds have a laitance on the surface that needs removed.
As for adhesive I've only used TileMaster AnhyFix & it's a fantastic product..

my current spec for any anhydriite is.
tilemaster plus primer . Fix ditra with tilemaster anhyfix and then fix stone or porcelain with setaflex.
i finally feel comfortable on anhydriite using this system provided screed dry as perrecommendations.

 

[Ajax123]

Alan sorry to butt in on this thread , but interesting.
i spoke to you the other day about an anhydriite screed I am due to lay on next week.
i sent the the contractor two f.ball hygrometer units and they are reading 92 rh.
i was surprised by this a s I had been informed the screed had been heated for a month but I now find today that the boiler not in and it is just hooked up to a small heater I think .
do you know a company that can supply and install a temporary heat to get this floor dry by Tuesday.
job is in Norfolk and a very prestigious job and delay would have big implications .
any help would be much appreciated .
i don't think if present system in place reading will get down to acceptable in next five days.

try these guys http://www.forcedry.co.uk

 

[Ajax123]

I knew you'd bite hehe!

I found myself annoyed by this thread.... I'm better now

 

[Stef]

Alan sorry to butt in on this thread , but interesting.
i spoke to you the other day about an anhydriite screed I am due to lay on next week.
i sent the the contractor two f.ball hygrometer units and they are reading 92 rh.
i was surprised by this a s I had been informed the screed had been heated for a month but I now find today that the boiler not in and it is just hooked up to a small heater I think .
do you know a company that can supply and install a temporary heat to get this floor dry by Tuesday.
job is in Norfolk and a very prestigious job and delay would have big implications .
any help would be much appreciated .
i don't think if present system in place reading will get down to acceptable in next five days.

Jonny I would also hire a couple of dehumidifiers to get rid as much moisture as possible to at least give you a fighting chance..

 

[High Peak Tiling]

It would be a requirement with natural stone tiles on heated screeds. The tiling standards make no such recommendations for much harder tiles like porcelaine opr ceramic.

Superb, thanks Alan.
I shall carry on to use the matting with porce and Ceramics though

 

[Lee@emctiles]

my current spec for any anhydriite is.
tilemaster plus primer . Fix ditra with tilemaster anhyfix and then fix stone or porcelain with setaflex.
i finally feel comfortable on anhydriite using this system provided screed dry as perrecommendations.

Thats my spec too (bar replace ditra for Dural!

 

[bugs183]

I'd stick with Ditra High Peak, we've used it for years and NEVER had an issue, i tried Dural and didn't feel comfortable with it especially after hearing some of the horror stories.
If your customer can afford it i'd always uncouple over u/f/h i've seen it crack 22mm stone thats got to be as hard as a 10mm porcelain tile. I warned them it needed uncoupling but didn't go for it.
Good to hear that people are finding a method not for fixing that they are confident with for these screeds

 

[Ajax123]

Superb, thanks Alan.
I shall carry on to use the matting with porce and Ceramics though

Ive no issues using the uncoupling it's just the standard only says about it with stone. Obviously it will do no harm as long as you get the right money for it.

 

[High Peak Tiling]

Ive no issues using the uncoupling it's just the standard only says about it with stone. Obviously it will do no harm as long as you get the right money for it.

Your better off with it, for the price of matting any screed the customer is better off I the long run.

 

[jonnyc]

Many thanks to Alan about his advice on my project.
i have made many calls over the last few years regarding anhydrite screeds and Alan seems to be the man in the know as I have been directed to him from various sources

 

[A&D Tilers]

Just remember that it always comes back to you the tiler, as a professional you will always be held responsible for checks before and after, a "it's not my fault gov I wasn't told"
we always get the builder or project owner to sign the floor over to us with the correct moisture reading and any prep work done prior to tiling, then we will do our own moisture, scrape sand and prime & finally tile.

 

[Aspect Tiling]

you are the floor layer, not the "lafarge chap" whichever that may be and not the client. The lafarge Chap is possibly an expert in the supply of liquid screed (or possibly not). He is most definitely not going to be an expert in tiling and sub floor preparation. Now then... If the floor fails and you have not prepared it in the manner recommended not only by your adhesive supplier, but by your entire trade association, and the tiling fails for what ever reason, be it prep, moisture, adhesive failure or whatever, do you really think the "Lafarge chap" will stand side by side with you to defend the failure. If you get the adhesive rep on site and he says "did you sand the screed" do you think he is going to stand by your side when you tell him no. I would be unable to offer you a defence were you to go ahead without preparing the screed in the correct manner. If it fails it will end up costing you and your reputation and you won't see the Lafarge chap for dust...

The "Lafarge chap is wrong, plain and simple. ALL SCREEDS AND CONCRETEs SHOULD BE MECHANICALLY ABRADED PRIOR TO THE APPLICATION OF BONDED FLOOR COVERINGS INCLUDING, TILES, VINYLS, WOOD FLOORS, RESINS AND LEVELLING COMPOUNDS. This requirement is set out in the tiling associations guide to tiling to anhydrite screeds

If you go ahead and ignore the sensible advice given by your own trade body and your adhesive supplier then, whilst I mean no offence, you deserve all the pain it creates for you... Sorry but there it is.

I have no intention of proceeding without properly preparing the floor and riding off into the sunset. Apologies if it came across that way, I merely stated the facts about the job in order to gain some clear advice and confirmation. For the sake of the cost of hiring sander I'll definitely be going down the correct route even if the customer feels it unnecessary. I'll let you know how it goes once completed.

Pete