Tiling on a painted plasterboard. HELP

[Stavs tiles]

Hi guys,

Hope you can help on this.

On a painted plasterboard can you tile directly on this?

I was thinking of scribingthe wall with a Stanleyknife every 2 inches so the adhesive has something to grip on, then rough sanding it and then cleaning it and using BAL Acrylic primer?

Or can I just tile over the paint providing the paint is not flaking off?

Any tips would be great. Just want a good strong bond. I will be using BAL rapid set adhesive.

Cheers
Stav

 

[Rich Midge]

What's it been painted with? I definitely wouldn't scribe it, you'll irreparably weaken the structure of the boards. Try sanding it back. Could you over board it or cut it out and replace?

 

[Stavs tiles]

Hi Rich, it's white emulsion paint.

Don't really want to board it again. It's a new build flat only 3 years old, so was hoping if I primed it up with acrylic it would give the adhesive something to grip to?

Attached are some pics of bathroom, the white small Ines will be removed.

Thanks

 

[Unused Account 1]

Just prime it and tile ,what size tiles you using

 

[WetSaw]

If those tiles have been put on properly you'll probably be replacing the plasterboard anyway.
What tiles are you putting up and are you tiling the whole wall?

 

[Stavs tiles]

Thanks guys, hoping the small tiles will come off ok, if not will have to reboard. I'm using 600x300 ceramic Matt tiles. Using BAL rapid set adhesive.

My main worry is just want the tiles to be bonded secure on the current wall :0

 

[Stavs tiles]

PDC sorry, tiling all the wall flirt to ceiling.

 

[Rich Midge]

I'd sand, clean then prime. Prime first with a quite a dilute mix so it absorbs right through the paint say a 5:1 mix then when that's dry go over again with a 3:1.

 

[Stavs tiles]

Thank you so much Rich, really appreciate your help

Will be using the BAL prime APD this is Acrylic based.

 

[One Day]

I'd suggest you call BAL technical tomorrow morning. They'll tell you!

 

[Rich Midge]

Not been a Bal user for years so can't feel I can comment on their primer. If you do call Bal technical tomorrow I can't imagine they'd advise anything other than replace or overboard, which is realistically what a pro would/should do. As mentioned earlier, see how you get on taking the existing tiles off. Chances are they're pulling the board with them.

 

[Stavs tiles]

Just thinking guys and sorry to open this up. What would the scenario be with a painted wall not plasterboard.

Image getting the paint off and scraping/sanding down is just the better option with this as well....

 

[Rich Midge]

Yep, basically you need rid of paint, especially emulsion.

 

[LM]

BAL technical told me in the past to apply a piece of high quality sellotape to the wall and rub on firmly, leave it for ten minutes and then remove it, if the tape pulls the paint off then you can't tile on it, if not then it should be fine providing you don't exceed the weight limits for plasterboard.

 

[Rich Midge]

Didn't think the tape test applied to emulsion paint though Lee? Thought it was only to be used on gloss and the like. My understanding was that emulsion could start to break down when wetted so shouldn't really be tiled on.

 

[LM]

Well that's what they told me, personally I'd be over boarding or replacing the plaster board for all it would cost to do anyway.

 

[Rich Midge]

Same.

 

[Tile seller]

If the paint is well stuck and survives the 'tape test'(decent sticky tape used) and, doesn't rub off with a wet cloth, (which being used in a bathroom it shouldn't. Prime it with mapei Eco prim grip, wait for it to dry and tile away.

 

[Italy]

I remove the paint from the plasterboard, with sandpaper mounted on grinder, primer and posing. stop

 

[On one]

As it is a 3yr old new build the tile adhesive will probably ready mixed and will pop off easily enough.......likewise the walls will be dry lined, so I would reluctant to interfere with the integrity of the walls
It looks like you definately enough depth on the bath to overboard the walls with new PB if you didnt want to remove the PB around the bath

 

[Flintstone]

I tiled a kitchen splashback only a week or so ago and that had one small area of painted plasterboard, not plastered, it was well and truly on there and would not scratch off so I primed and tiled it with standard set, no problem. Might be a different story if it was a bathroom with heavy tiles tho. Emulsion normally comes off easily if you wet it. If that is the case you need to get it off.

 

[Dumbo]

BAL technical told me in the past to apply a piece of high quality sellotape to the wall and rub on firmly, leave it for ten minutes and then remove it, if the tape pulls the paint off then you can't tile on it, if not then it should be fine providing you don't exceed the weight limits for plasterboard.

I was told the same many moons ago on a bal course

 

[One Day]

I was told the same many moons ago on a bal course

For eggshell and gloss. Not emulsion. Somewhere in bs5385 i seem to remember advice being to score 2mm x 2mm lines into the paint with Stanley knife, then apply tape. If it removes most of the paint (which invariably it will) don't tile direct, mechanically remove the paint.

 

[One Day]

2011 edition. No mention of tape test.

 

[Cris]

Just prime it and tile ,what size

Can't just prime and tile emulsion.especially if it's floor to ceiling ! it's water based and breaks down when wet. at very leased rake walls with old saw blade to get a decent key then sbr.deffo wouldn't put anything over 20kg/m on it tho

 

[Unused Account 1]

If your using rapid set fexi ,prime and away you go ,sticks like hit

 

[One Day]

If your using rapid set fexi ,prime and away you go ,sticks like hit

And keep your fingers crossed...

 

[Cris]

I think half way up wall be ok but anything above head height is a real danger. I'd wanna be 100% sure nowts coming down and tiling onto emulsion walls I wouldn't be

 

[Stavs tiles]

After reading all these comments which I really appreciate. I'm gona put some elbow grease into this bathroom and scrape, sand the walls down. I have a steamer and if I need to use this and spend all day removing the paint then so be it.

Firm believer of if you do things the right way it won't come back and bite you on your arse

What a pain in the arse tho with painted walls. Days labour will be just the removal of paint lol

 

[On one]

Just a word of caution regarding using a steamer........if your walls are dry lined, you will end up ruining the PB before getting the paint off.
If you remove one of the tiles you should be able to distinguish between a dry lined wall and a plastered wall........a plastered wall, you should be able to steam the paint off easier.