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Old 20-04-2008   #25
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Default Re: anhyrdrite screeds

Schluter also do a piped under floor heating when carried out to their spec they guarantee against any cracking
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Old 20-04-2008   #26
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Default Re: anhyrdrite screeds

Quote:
Originally Posted by JOHNNYCLARKE View Post
just been to look at job now with a diy dampmeter and it feels and looks damp still after 24 days down.
Screed is apparently 40 mm thick which should mean 40 days to dry.
Dont know what to do as committed myself after talking to the mapei tech guy on friday who said would be ok.
If i put this accrylic primer G down will this stop any moisture from screed coming up or just some?
I thought if it really seals in screed then any moisture would move sideways and up wall which would be fine would it not!

CLIFF IF YOU LOOK AT THIS I WOULD REALLY APPRECIATE MORE ADVICE OR CAN CONTACT ME DIRECT.
I AM DUE TO START MONDAY BASED ON MAPEI INFO BUT NOW IM CONFUSED.

THANKS JOHNNY
Colin Stanyard our Anhydrite Guru will call you first thing Monday !

MY Post just got tagged with a screedflo Anhydrite AD !!!!
----
You probably all guessed that i'm not a fan of the "Devil's" screed !

But just to clear the confusion if you use Ditra matting , Mapelay or similar - you're not actually fixing cement based adhesives to the anhydrite - so the rules have changed.

PS if the screed was Topcem you only have to wait days not weeks !

Cliff


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Mapei - The worlds largest maunfacturer of tile adhesives

Last edited by Cliff Anger; 20-04-2008 at 09:23 PM. Reason: Automerged last two posts from the same member. Happy tiling. :-)
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Old 21-04-2008   #27
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Default Re: anhyrdrite screeds

Does the screed still have to be below 2% moisture though Cliff?
Would recommend fixing with a contact adhesive?
I too hate this screed.

[SIZE=2][B][COLOR=red][/COLOR][/B][/SIZE]
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Old 21-04-2008   #28
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Default Re: anhyrdrite screeds

Brantys spot on, remove the laitance and check the moisture content, Thats a must. then prime thouroughly. both directions allowing to dry in between, one thing they do have going for them is they are flat which you dont get too often these days. Stick to brantys advice you wont have any problems.
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Old 22-04-2008   #29
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Default Re: anhyrdrite screeds

Johnny

You will find that Ditra matting is "breathable" albeit with a quite low vapour transmission rate.............but thats how the moisture gets out

dock


ps provided, as branty points out, the start point is 2% moisture as stated by schluter

Last edited by dock; 23-04-2008 at 07:41 AM.
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Old 22-04-2008   #30
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Default Re: anhyrdrite screeds

[quote=dock;76180]Johnny

You will find that Ditra matting is "breathable" albeit with a quite low vapour transmission rate.............but thats how the moisture gets out

dock[/quote]
But there website does recomend a moisture content no greater than 2%. I think.


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