Tiling Onto Carlite Bonding !

[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.

 

[Stuart Williams]

This is a topic I'm looking for advice on right now. We had our builder level our walls so they did it with Carlite bonding and said to PVA then tile on it - clearly now this isn't good advice. So, as it's a bathroom what finishing coat do you suggest before tiling, I'll end up doing this myself. Sand and cement? Boarding isn't really an option, it's a small room.

 

[White Room]

British Gypsum don't recommend tiling onto a Thistle bonding coat, what tiles are you going to fixing.

 

[Stuart Williams]

British Gypsum don't recommend tiling onto a Thistle bonding coat, what tiles are you going to fixing.

600x300x10mm ceramic tiles - not sure of the weight as they are sitting in storage / mum's garage

 

[White Room]

Don't understand the sand/cement bit, pva and a multi finish should suffice...there has been talk recently that no pva should be used in any moisture areas involved with gypsum plaster.

 

[Stuart Williams]

Don't understand the sand/cement bit, pva and a multi finish should suffice...there has been talk recently that no pva should be used in any moisture areas involved with gypsum plaster.

Thanks. I was wondering if a sand and cement mix would be an option for a finish, but it seems as though a one coat or similar plaster finish should do the job and ensure I have a good surface to tile on once it's had time to dry. May be worth looking into SBR over PVA then, this tiling was supposed to be a simple job but seems to be quite technical

 

[White Room]

Thanks. I was wondering if a sand and cement mix would be an option for a finish, but it seems as though a one coat or similar plaster finish should do the job and ensure I have a good surface to tile on once it's had time to dry. May be worth looking into SBR over PVA then, this tiling was supposed to be a simple job but seems to be quite technical

Sand/cement on top of a bonding coat is a big no no, the reason a pva is used is that it needs to tacky whereas sbr doesn't really give you that option.

A thinned coat coat of pva, leave to soak in then a thicker pva wait for it to go tacky then apply the multi finish.

The bit about no pva in bathrooms etc, been doing it for donkey years so shouldn't sweat on it.

 

[Tile Shop]

• Tiles up to 20kg/m2
can be applied directly to Thistle finish
coats. If a bonding agent is used the limit is reduced to
12kg/m.

Thats something I never knew! Are they talking about just PVA or do SBR and Acryllic have this affect aswell? Cuz you're options would be severely limited if you use cement adhesives if that's the case.

I'm keeping my fingers crossed that I haven't just said something completely thick!