Browning plaster

[groucho]

Hi guys Just starting a bathroom took tiles off walls need plastering. Chat with plasterer siad he would use a bonding coat only (browning) just double checking thats right. how long to wait until I can tile. Was going to leave it for 4 days. Thanks

[theyomper]

Some one will correct me but as far as I am aware Bonding is no good as a surface to tile onto. Can't think of the why's and wherefore's.

[groucho]

Just been on gypsum website it states no thistle undercoats can be tiled to apart from dri-coat. but how long to wait until dry anybody know? ta

[Alan.P]

Some one will correct me but as far as I am aware Bonding is no good as a surface to tile onto. Can't think of the why's and wherefore's.

There can / will be a chemical reaction between the plaster and the addy causing crystallisation and failure.

Just been on gypsum website it states no thistle undercoats can be tiled to apart from dri-coat. but how long to wait until dry anybody know? ta

I think IIRC the rule of thumb is 24 hours per mm thickness. Someone might be along to correct me on that though.

[Wylie]

As far as i know browning isn't used anymore you would have to check with health and safety,i wouldn't like to tile on it anyway as its a light weight plaster,Carlite bonding is a medium weight plaster can it be tiled don't know

[devonmark]

tell him to plaster with one coat, should be left as already said day per 1mm

[NETT Darren]

Dont tile on the browning as it is too porus, you need to skim it over with a finish plaster, the browning takes 4 weeks officially to dry out but thats B Standards, leave it for a week and a half after finish plaster coat to dry out then tile, cant see why your plasterer has used browning, should have dot and dabbed the wall then you could have tiled on it in a couple of days

[Dave]

As mentioned base coats are NOT a suitable substrate to tile too...

They are not stable enough to tile directly to and need a finish coat first.....but as mentioned above not very often base and skim coat type plastering is done now...nearly all dry lining and skimmed or even taped and filled...

But anyway do not tile to base coats.......one coats like the wickes one i use are fine...rapid drying and very hard when dry...

[groucho]

maybe I should of skimmed in with bagged ady as I went. Its only the plaster that has come off and old ady on the wall so the plastering wont be that thick 4/5mm max. but felt that I would be fighting against the walls (24 sqm tiles 40x25) thanks for all the advice lads. getting it skimmed over with multifininsh.

[anaheimduck]

Any Lighhtweight undercoat plasters should have a topcoat Browning is still available but it is not recomended for high suction backgrounds Bonding is for Plasterboards and concrete Hardwall and toughcoat are for most brick or block backgrounds as long as dust free and dry
The best medium for tiles is good old sand and cement rubbed up to a flat finish
Regards
Colin