tiling on to bonding

[gardenveg]

Hi am new here.
Have a bit of a problem. jUst had to take off some tiles from bathroom that were put on about 2 months ago.
Some of the plaster has come away on the wall leaving the plasterboard underneath on view which is an area about 20 inches by 8 inches above bath where shower will be.
Need to retile but have been told no need to plaster this area but can use either bonding on it or just fill in the area with extra adhesive when to retile
Bit worried as have seen on this forum that should not tile on to bonding as absorbs moisture. I don't want the tiles falling off the wall particulary as it is by the shower over the bath so lots of water and steam.
Is is best to chip off lose plaster and replaster the area again before retiling .

 

[DHTiling]

Hi and welcome, when you say leaving the plasterboard.. is this still intact..?

it would be better if you could post a pic, so we can see what you do.

 

[gardenveg]

Yes the plasterboard is intach. Here are a couple of photos of area.
cheers.

 

[gardenveg]

sorry

 

[DHTiling]

I would scrape any loose plaster off and then skim in with rapid set tile adhesive... priming first..

 

[steve187]

Hi and welcome, as Dave said, dont use extra ready mixed adhesive as it will be too thick

 

[jwatson]

defo dont use bonding plaster!!

 

[gardenveg]

Thanks everyone.
Why would it not be best to scrape off all the loose plaster and plaster over it again rather than skim it with rapid set tile adhesive. Is is a question of cost.

 

[jwatson]

you will have to wait for two weeks to tile if you plaster it. spf the area.

 

[DHTiling]

The plaster will need to dry and gain strength.. the adhesive will be set in hours..

 

[Time's Ran Out]

Take the plasterboard off and refix with eithet Wedi or Hardie tile backer boards.

 

[The Plasterer]

if I was you I would
1) hack off all loose plaster around the area , from the pic the plasterwork looks in bad condition .
2) plaster it again with Thistle Bonding , but just before the bonding sets wet a brush and run it over then bonding to close it in .
3) after it's set by at least 12 hours give it 1 strong coat of Pva ( mixed to manufactures strength )
4) tile it after the pva has dried

I would personally say pva all plasterwork before tiling , you could even put in some emulsion to the pva mixture , as that will also help to seal the plasterwork

hope that helps , Jim.

 

[jwatson]

not very good advice there pal. wouldnt use bonding plaster and absolute no no to PVA in any tiling installation,

if I was you I would
1) hack off all loose plaster around the area , from the pic the plasterwork looks in bad condition .
2) plaster it again with Thistle Bonding , but just before the bonding sets wet a brush and run it over then bonding to close it in .
3) after it's set by at least 12 hours give it 1 strong coat of Pva ( mixed to manufactures strength )
4) tile it after the pva has dried

I would personally say pva all plasterwork before tiling , you could even put in some emulsion to the pva mixture , as that will also help to seal the plasterwork

hope that helps , Jim.

 

[Martino]

obv thats a plasterer for you strange to see how easily mistake's can be made! im sure your a great plasterer pal but dont reccomend pva or paint to tile on

 

[gardenveg]

I understand that bonding plaster should not be used when tiling as it absorbs moisture which I presume means in time the tiles will fall off. Is this the case.?

 

[afright]

Use SBR not PVA.

 

[Andy Allen]

if I was you I would
1) hack off all loose plaster around the area , from the pic the plasterwork looks in bad condition .
2) plaster it again with Thistle Bonding , but just before the bonding sets wet a brush and run it over then bonding to close it in .
3) after it's set by at least 12 hours give it 1 strong coat of Pva ( mixed to manufactures strength )
4) tile it after the pva has dried

I would personally say pva all plasterwork before tiling , you could even put in some emulsion to the pva mixture , as that will also help to seal the plasterwork

hope that helps , Jim.

think you need to stick to plastering.......:lol:

 

[DHTiling]

It is more the case that it is not stable enough to tile directly too.

 

[The Plasterer]

ok , I'm happy to accept that I'm wrong on the Pva thing , but not sure what the objection is on Bonding ????? , especially as it's been '' closed in '' by running a wet brush over it just before it sets , and bearing in mind that the original question was about a reasonably small patch area , I recon you'd '' get away with it ''
but I have'nt joined these pages to have a row , so I'll sit back quietly and shut up and see how this develops.

 

[Colour Republic]

ok , I'm happy to accept that I'm wrong on the Pva thing , but not sure what the objection is on Bonding ????? , especially as it's been '' closed in '' by running a wet brush over it just before it sets , and bearing in mind that the original question was about a reasonably small patch area , I recon you'd '' get away with it ''
but I have'nt joined these pages to have a row , so I'll sit back quietly and shut up and see how this develops.

You may have closed it slightly but it's still far too porous and unstable, you may have 'engineered' it but not enough and if you read gyproc's data sheets they even state not to tile on to it.

I hope you haven't taken offence to the comments in this thread, it's just that a lot of plasters think the same as you and go ahead and do this before the tiler has got on site then they have to deal with an unsuitable substrate and then have to convice the home owner the plasterer despite what he thought was wrong.

So in the interest of better understanding, bonding is not suitable to tile on to and neither is PVA a suitable primer. Now please, please, please spread the word with the rest of your trade!!!!!!!

 

[DHTiling]

ok , I'm happy to accept that I'm wrong on the Pva thing , but not sure what the objection is on Bonding ????? , especially as it's been '' closed in '' by running a wet brush over it just before it sets , and bearing in mind that the original question was about a reasonably small patch area , I recon you'd '' get away with it ''
but I have'nt joined these pages to have a row , so I'll sit back quietly and shut up and see how this develops.

Just to clarify why not to then read num 13 on this link>>>>> Tiling to Gypsum Plaster

 

[The Plasterer]

Just to clarify why not to then read num 13 on this link>>>>> Tiling to Gypsum Plaster

Cheers for that Dave , must confess I really did'nt know that bonding was so bad for tiling onto , just goes to show that even after 28 years plastering experience , I can still learn a few things . ( but I've even but in my profile that I'm an Amatuer at Tiling , and do hope to pick up helpful hints and tips from the guys with the experience . )

slightly in my defence , I did know about number 14, and when plastering a bathroom that's going to be tiled , I never "polish" the plaster work and tend to run a very light brush over the surface just before it sets to give a slight Key for tile adhesive to stick to.

 

[The Plasterer]

I hope you haven't taken offence to the comments in this thread, it's just that a lot of plasters think the same as you and go ahead and do this before the tiler has got on site then they have to deal with an unsuitable substrate and then have to convice the home owner the plasterer despite what he thought was wrong.

. Now please, please, please spread the word with the rest of your trade!!!!!!!

I'll do me best

 

[DHTiling]

Cheers for that Dave , must confess I really did'nt know that bonding was so bad for tiling onto , just goes to show that even after 28 years plastering experience , I can still learn a few things . ( but I've even but in my profile that I'm an Amatuer at Tiling , and do hope to pick up helpful hints and tips from the guys with the experience . )

slightly in my defence , I did know about number 14, and when plastering a bathroom that's going to be tiled , I never "polish" the plaster work and tend to run a very light brush over the surface just before it sets to give a slight Key for tile adhesive to stick to.

Every day is a learning day, nobody knows it all and hence why members pointed you in the right direction... stick around and enjoy the banter etc.

 

[Colour Republic]

nobody knows it all

errrr not true :seeya:


:rofl: