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Discuss Retro fit ufh & Hydrogen gas causes floor failure. in the Canada Tile Advice area at TilersForums.com.
No, I do not recognise them, I have seen board with similar colour.I need to know you !!
I have never seen them before.
Do not you recognize them?
you are the tilers of the panels !!
I do not use panels
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.
I have never found a suitably practical priming technique that was guaranteed to overcome it though..
Is that why we put slip coats on celotexAny alkali in contact with the un oxidised aluminium foil on insulation will have the same reaction. That goes for gypsum levellers, screeds and tile adhesives as well as those based on cement including sand cement sreeds. With gypsum the reaction is somewhat slower as tge evolution if hydroxyl ions is slower. Typically though it will still happen within a few hours of application. With gypsum screeds it results in what look very much like mole hills on the screed surface. I gave been able to limit it in the past by applying several thick coats of PVA. Yes I said PVA... lol. I have never found a suitably practical priming technique that was guaranteed to overcome it though. Interestingly if the foil has been around gircacejile and has oxidised the reaction us much less pronounced. I did try using a vinegar solution to promote oxidation once but the whole house stank for weeks after.
Epoxy might work but it would be an expensive solution.
The reaction is partly the reason why all floating screeds should be placed on a polythene slip membrane.
I hope you ran this past Spacey first Alan before postingThe 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.
there's very little that they claim that can't do.Thank you Alan.
Are you able to guess as to why Mapei state that they're eco prime and grip works as a primer Alan?
I'm going to refrain from comment in respect of my opinion of Mapeithere's very little that they claim that can't do.
use it to prime resin backed stone, painted epoxy floors, gypsum
its a wonder product
Not sure it binds the alkali element but some latex compounds have resistance to alkaline conditions. Styrene butadiene is used to make latex concretes which have high flexural strength. I don't know what the mapei stuff is made from so not sure. I know it's a type of latex so maybe it's the butaduene form.In the case of using the Isolastic liquid, does it bind the alkali element of the Portland Alan, how does it work?
Mapei also state that latex plus is a no no,
reading tech sheets there's little or no difference in the two products, but I'm sure there must be something.
Would just like to understand how this can be prevented.
Reply to Retro fit ufh & Hydrogen gas causes floor failure. in the Canada Tile Advice area at TilersForums.com