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Discuss Failed anhydrite floor in the Canada Tile Advice area at TilersForums.com.
I had bother with primer on top of Gyvlon a few weeks back,
That primer looks like a neat coat & has just came away like a skin.
Should only be 1 coat of primer at 3:1.
As you say John, it will be an easy rip out.
Don't know but is it possible to be too dry?? This might absorb all the fluid, thus leaving a skin?That was my thought Stef, don't have a pic of what was left on the floor but I suspect very little of the primer as it's still stuck to the adhesive. As you say the first coat would have probably been sufficient and was a little confused when the screeding contractor had told the builder to put a 2nd coat of neat primer over the top. This would have formed a skin and therefore the probable cause of failure.
John I used AnhyFix & should have done a test area without primer.
It states a 3:1 coat though.
The tapers had been in taping the ceilings & had dropped (as they do) a fair amount of fast set onto the floor & I was struggling to knock it off with a scraper.
I think we are going to see a lot of failures coming up with Calcium screeds.
Didnt you sand the floor 1st ?
Just add to this one John, it'll keep all the info in the same place for future reference.
Did it straightaway Bri, can you merge the 2?
http://www.tilersforums.com/tiling-forum/71268-another-floor-failure.html
So your saying the screed cannot be at fault and not to question it at all.
No I mean for sand quailty
Anhydrite screeds are made in ready mix facilities where they are subjected to quality assurance regimes. The sand used is specially selected and tested for suitability by the binder manufacturers (us). The measure of sand quality is usually determined by how quickly the screed hardens. Ergo you will prove that the sand is of good quality and suitable for inclusion in the screed by doing such a test. We already know the answer before the screed is made. Same with the binder. It is unusual in the extreme for there to be anything aims with the individual components of the screed such that standard statistical process control will take care of things. Add the sand and binder together with water and you have a screed mortar. There really isn't much to go wrong during the manufacturing process itself.
Most of the issues with screeds of all types are caused not by the screed itself but what people do with it and how they do it....
Thanks for that , is there any type of pourable floor that does not need sanding and sealing
from purely a tilers perspective, gypsum threads certainly seem to throw up more problems than solutions, we only seem to get answers ipso facto, ie, latching the stable door after horse has bolted. Alan this is no disrespect to you whatsoever, alone, you have stood your ground and tried to explain, at bloody long length, the merits of anhydrite, but personally the only people I can see benefitting are builders looking for a quick screed.. I'm in the minority have now (having the "know how" now) as to how to prepare and test for a anhydrite screed, but Cap'n Quick and Cheerful, down the road from me will only be to willing to tell customers that I'm talking a load of garbage and he'll do it for half the price....need I add more?
I always ask the question "what type of screed is this?" after attending Alan's course in Durham, I realize how hard it is to distinguish the anhydrite from sand and cement just by looking at them.
I think the key is to find out who laid the screed, and what is it?
as do I Phil, but most, won't ask as they've never heard of it, thus just assume it's normal concrete screed, and the rest, as they say, is historyI always ask the question "what type of screed is this?" after attending Alan's course in Durham, I realize how hard it is to distinguish the anhydrite from sand and cement just by looking at them.
I think the key is to find out who laid the screed, and what is it?
Bri, that's a given with a concrete screed, ie perimeter expansion joint.I always ask now, even if I think I know what it is. Anhydrite is normally easy to spot with all the foam barriers around the perimeter. It has a yellowish colour as well.
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