Tiling skimmed plasterboard


Postby RichardM » Sun Mar 01, 2009 3:36 pm

I want to tile some skimmed plasterboard. Can I just tile straight on to it or does it need to be scored or even primed first. Thanks in advance.
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Postby rosebery » Sun Mar 01, 2009 9:57 pm

Prime it with Bal APD or similar. Do NOT use PVA.

Skimmed plasterboard can take a max weight of 20kg per sq metre - thats inclusive of adhesive and grout BTW.

HTH

Cheers
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Postby RichardM » Mon Mar 02, 2009 11:57 am

Thanks for the reply. Do I need to score or scratch the plaster and if so do I do this before or after priming. Thanks
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Postby rosebery » Mon Mar 02, 2009 11:47 pm

"Do I need to score or scratch the plaster ..................... "

Nope.

Cheers
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Postby RichardM » Tue Mar 03, 2009 11:30 am

Thanks for the advice. All set to get going now.
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Postby acsimpson » Wed Mar 04, 2009 4:39 pm

Hi, I've read your advice about not using PVA onto plasterboard before tiling due to it leaving a thin layers which will be all that hold the tiles in place. Unfortunately I only read it after my plasterboard had a coating of PVA on it. I wonder what your advice would be regarding fixing the problem before I start tiling.
Thanks in advance.
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Postby rosebery » Thu Mar 05, 2009 8:59 pm

Some tilers will tell you you can tile direct onto PVA and do it as a matter of course. The manufacturer of one of the cheap tubbed addys (available from Bargain and Quick) says use it.

Several of the specialist adhesive manufacturers say its a No No and I trust their advice. I've seen a load of tiles fall off a wall that was PVA'd first (no it wasn't me that did it!) and have found tiles that were still up but hanging on literally by the grout on walls that had been PVA'd. Thats why I say don't do it. I'm not about to have them fal off when I was paid to put 'em up in the first instance. Just to put in in perspective before someone comes along and contradicts me.

Anyhow to remove the PVA you'll find that some hot water and elbow grease should shift most of it. A bit of a sand afterwards should deal with what's left.

HTH

Cheers
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Postby acsimpson » Fri Mar 06, 2009 10:37 am

Thanks,

My adhesive certainly recommended it for porous walls. It sealed the dust nicely on my kitchen walls where the builders had riped the old tiles off rather heavy handedly, but on rough walls I'm hoping there will be enough for the tiles which are already in place to keep gripping too.

I'll be taking the PVA off the plasterboard before tiling though, better safe than sorry.
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Postby rosebery » Fri Mar 06, 2009 1:43 pm

Oh certainly use it on brick/blockwork before plastering and plaster before it dries. Should not be used on plasterboard before skimming hough and never (IMHO) before tiling.

Be careful not to degrade the surface of the plasterboard. Actually if you are using an adhesdive that says use it then why remove it? Go ahead anyway and if they do fall off you can take the manufacturer to task.

Bit of a risk but you DO have a fallback position in case of problems because you were following manufacturers instructions.

Cheers
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Postby chris_on_tour2002 » Sun Mar 08, 2009 10:47 pm

not normally necessary to prime raw plasterboard as it's designed to take a finish - be it a skimming plaster or adhesive (provided the surface of the board is dust-free and you are tiling onto the correct side of the board). only needs a sealer if the plasterboard has been skimmed.

anyhow, as rosebery says, if you are following the manufacturers guidelines then you are covered.
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Postby rosebery » Mon Mar 09, 2009 11:33 am

"not normally necessary to prime raw plasterboard as it's designed to take a finish"

Chris

How do you avoid the plasterboard sucking the moisture out of the addy if you don't prime?

Cheers
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Postby chris_on_tour2002 » Tue Mar 10, 2009 12:24 am

fair and valid point - plasterboard is really designed to take a plaster skim i suppose. SBR primer would probably be better than tiling without priming
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Postby rosebery » Tue Mar 10, 2009 9:23 pm

"SBR primer would probably be better than tiling without priming"

Indeed although my preference is for APD on plasterboard or plaster skim. SBR for cementatious or rough surfaces.

Cheers
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Postby acsimpson » Tue Mar 17, 2009 2:05 pm

Thanks for the advice.

I tried scrubbing the PVA off the plasterboard but it just started taking the paper off instead so I stopped. The instructions on the adhesive (I had a tub of fix and grout sitting around) said to use PVA for porus surfaces so that's what I've done. hopefully the tiles will stay in place but if not it's just for a utility area in the garage so no great harm done.
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Postby rosebery » Tue Mar 17, 2009 8:07 pm

"The instructions on the adhesive (I had a tub of fix and grout sitting around) said to use PVA for porus surfaces"

That would probably be the U.....d one then.

I wouldn't use combined addy and grout either!

Cheers
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