L
LM
"No exspansion joints needed" says the tiler??? Really!!!
Retro fit ufh & Hydrogen gas causes floor failure.
Not a wunda-full job to have to sort out
I've never come across one of these ufh systems.. should you slc over the pipes first like we would normally?
O
Old Mod
Ok for those who really want to get their geek on,
@impish @LEE MAC 🙂
Here's some technical explanations of the effect of aluminium coming into contact with Portland cement.
These extracts are taken from an American site, where this information was also posted.
If any budding chemists on here want to have a go at enlightening the rest of us, it'd be appreciated. 🙂
@impish @LEE MAC 🙂
Here's some technical explanations of the effect of aluminium coming into contact with Portland cement.
These extracts are taken from an American site, where this information was also posted.
If any budding chemists on here want to have a go at enlightening the rest of us, it'd be appreciated. 🙂
O
Old Mod
That is an option Mark, yes, but you MUST prime prior to levelling.
O
One Day
On that stuff two coasts of Multi Surface Primer (treat the aluminium as a tile surface) would be appropriate?
O
Old Mod
Well that's a question we have asked and are waiting a response on Mark.
O
Old Mod
I'm not going to generalise Mark as this is such a delicate system when all said and done, so check with the manufacturer that it meets the requirements.
Not all primers are suitable.
This isn't the first one I've seen fail. This is the 3rd. Thankfully I've not come across this wundafull stuff.
F
Flintstone
I haven't seen one in the flesh but i would be very very careful about tiling over this sort of system or any other retro fitted wet ufh for that Matter
O
Old Mod
In the main Andy there's a fairly standard way of dealing with them now, it's taken a while, but most agree now.
Manufacturers and adhesive companies.
And I say that with trepidation tbh, cos the goal posts get moved a lot.
Manufacturers and adhesive companies.
And I say that with trepidation tbh, cos the goal posts get moved a lot.
What's next mate......
Finding the missing Malaysian plane flight MH370..🙂
Finding the missing Malaysian plane flight MH370..🙂
J
J Sid
his done that Andy, just hasn't posted the pics yet 😉
The calcium hydroxide aluminium reaction is fairly basic chemistry. The same thing happens when you put calcium sulphate direct to aluminium. Priming has generally proven to be ineffective in preventing the reaction so the best thing js to avoid it altogether by either not using aluminium or putting a slip membrane down first.
O
Old Mod
So using an anhydride screed over aluminium would result in the same reaction Alan yeah?
So would that translate in to any anhydride suitable products like Anhyfix adhesive, or Anhylevel have the same reaction? Just trying to clarify.
I know you know you're correct, but we can definitely confirm that, through our research we found that a lot of priming methods were ineffective.
Any further info would be helpful Alan, thanks.
D
Dumbo
Typical companies releasing products onto market without proper research or testing just to make money and leaving end user to clear up the mess .
F
Flintstone
is af200 cement based ?
O
Old Mod
That not strictly true in this case tho.
They give clear instructions on how it should be dealt with.
You just have to read them and not make up your own interpretation.
O
Old Mod
What's the relevance Adndy?
S
Spud
I read some articles which stated the only primer or barrier to the reaction was bitumous based,even Silicon barriers didnt stop the reaction taking place , pretty pointless priming with bitumen if you are using ufh, thanks for your help Alan that cleared a couple of questions up Marc and I were considering ?
D
Dumbo
So cold an adhesive like ba
But according to ajax it would fail even if primed or do the products they recommend not contain cement or andhydrate
I
Italy
How many problems do you have ..
Do, as I did,
place, a concrete panel 6mm. (Without adhesive).
Tape on junctions.
And use epoxy adhesive.
that's no good?
Do, as I did,
place, a concrete panel 6mm. (Without adhesive).
Tape on junctions.
And use epoxy adhesive.
that's no good?
F
Flintstone
Weather an option for sucessful install would be ditra over the foil with af? Not in this instance obviously
J
J Sid
a floating floor then Antonio, yes?
I
Italy
O
Old Mod
So we're working through all your questions one by one whist trying to research at the same time. Bear with us guys.
H
hmtiling
What about an epoxy primer as a barrier?
Last edited by a moderator:
O
Old Mod
It will still react with dry concrete, only a little slower.
O
Old Mod
Covering the whole system with liquid dpm Harry?
Is that what you mean, have you said that out loud to yourself yet? 🙂
O
Old Mod
These are the install instruction.
There are similar tiling threads here
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