Tanking failed AGAIN

[Rossymcg]

As previously posted I had a palace tanking kit peel from the walls 4 weeks after plastering, they sent out another kit peeled again 7 weeks after plastered,,
now over 8 weeks later a mega tanking kit has peeled, it's seriously doing my swede in, any ideas?
I've only ever used painted on kits what are my other options?

 

[beanz]

has the plaster work been polished by the plasterer?

Apparently not, and he's sanded it in anyway.. If it hadn't happened twice, I'd have thought there was still some dust from the sanding!?! To me, it can only be the wrong mix with the primer, some sort of contamination on the paster, or a faulty primer..

 

[Rossymcg]

Spoke with the Mega rep yesterday, he assures me that the peeling is normal,
as long as it's not falling off and it has some resistance, also in the colder months it could take longer to dry out.
ive re checked it and yes it has bonded better but still not sure about what the rep had said

 

[beanz]

Sounds dubious to me, but what do I know..!?!

 

[Qwerty]

Peeling is not normal!!! How can that ever be normal?

 

[High Peak Tiling]

Peeling is not normal!!! How can that ever be normal?

Spoke with the Mega rep yesterday, he assures me that the peeling is normal,
as long as it's not falling off and it has some resistance, also in the colder months it could take longer to dry out.
ive re checked it and yes it has bonded better but still not sure about what the rep had said

How can any peeling be acceptable... let alone normal!

 

[Rossymcg]

I know, what chance do I have with that answer?

 

[Old Mod]

Tell him u want it in writing so if it all peels off when tiled u can tell the client "oh it's quite normal!" :rofl:

 

[prceramics]

some primers you have to tank while the primer is still wet for instance the ultra one says on the 2nd coat of primer aply the layer when the primer has turned clear in colour but still wet

 

[True Tiling]

Was a bonding coat applied before plastering? If so, this will extend the time moisture needs to escape before covering it over; up to 2 months depending on the depth of the bonding coat and plaster and temperature.
I suspect that moisture is trying to escape, thus de-bonding the covering you are placing prematurely on it. Is it an external wall? (if so, you may have damp/condensation issues which will cause de-bonding)
Hope this helps.

 

[Rossymcg]

Was a bonding coat applied before plastering? If so, this will extend the time moisture needs to escape before covering it over; up to 2 months depending on the depth of the bonding coat and plaster and temperature.
I suspect that moisture is trying to escape, thus de-bonding the covering you are placing prematurely on it. Is it an external wall? (if so, you may have damp/condensation issues which will cause de-bonding)
Hope this helps.

1 wall is an external wall but I used gypliner and Kingspan in between studs to create a thermal barrier and decouple plasterboard from external wall,
interbal wall was dot and dabbed, where tanking has been painted on the plaster board at the bottom of the walls it's stuck solid,
im seriously puzzled

 

[True Tiling]

Me too. I can only think that some kind of moisture-trap has been created intercavity.
I can't fathom anything else.

 

[TJ Smiler]

Do you know if a cement based adhesive will stick to the p/board? if it does then maybe you could waterproof by using a matting rather than tanking. not sure about this peeling thing, don't sound right to me unless your really digging your finger nails into it and working it off.

 

[Dan]

Just bumping some of the older popular (sometimes not so popular) threads. Probably wont be current discussion these days but I just need to do it. So just ignore the thread if it's not current for you.