Repairing Plaster Before Tiles

[chrisb1357]

Hi all

We had some areas of plaster repaired by the council in the bathroom last year but I never gave the plaster a miss coat of paint etc after it dried and we are tilling the bathroom next month. Do I need to apply a mis coat or some other type of agent before we apply the tiles to these area.s

Chris

 

[White Room]

An acrylic primer or sbr, no pva or a miss coat...

 

[Alan.P]

What tiles are you planning on fixing, no painted areas at all.

 

[Bubblecraft]

As above, no miss coat or PVA. Stick with an SBR

 

[chrisb1357]

Hi

I was looking at just a basic white 198x248mm gloss, bumpy tile with list a mosaic border.

But then again I just started to remove the blown plaster and the half the plaster has decided to fall off the wall.

Well this morning I started to remove the blown plaster. I scored around the area's in the middle but half the other plaster decided to fall off the wall which I guest its a good job I did not try and tile over before hand.
Now where do I go from here. DO i just remove the rest of the top layer of plaster skim for the whole wall as the rest just seems to crumble off and have the whole wall skimmed then maybe tile or paint.

 

[Alan.P]

If the plaster has blown then I wouldn't risk it, take the lot off and either get it re-plastered and skimmed or overboard it with plasterboard, don't skim the plasterboard, just fix straight to it.

 

[BoldreChris]

Yes, looking at the photo, there isn't enough depth behind the pipes to get a layer of plasterboard on top of the existing plaster so you'll have to strip off the crumbly skim coat then repair the holes in the undercoat plaster. When that's dry, PVA the whole wall, let that dry and then skim it all flat. Then when that's dry, prime it with either SBR or a proper tiling primer and when that's dry, you're ready to tile !

Of course, if the undercoat plaster is falling off the blockwork, it'll all have to come off and then plasterboard is your best bet, as above.

 

[chrisb1357]

Hi

Well its all off now. did not take long to be honest as the rest just fell off. The undercoat plaster seems ok apart from them small area's none of that fell off but it does seem a little sandy when touched. Is that normal for undercoat?

Chris

Yes, looking at the photo, there isn't enough depth behind the pipes to get a layer of plasterboard on top of the existing plaster so you'll have to strip off the crumbly skim coat then repair the holes in the undercoat plaster. When that's dry, PVA the whole wall, let that dry and then skim it all flat. Then when that's dry, prime it with either SBR or a proper tiling primer and when that's dry, you're ready to tile !

Of course, if the undercoat plaster is falling off the blockwork, it'll all have to come off and then plasterboard is your best bet, as above.

 

[chrisb1357]

How much would you think to get them holes re plasterd and then a skim over the whole wall?

How come the skim comes off so easy on external or block walls and on the studded walls its fine

Chris

 

[White Room]

Hi

Well its all off now. did not take long to be honest as the rest just fell off. The undercoat plaster seems ok apart from them small area's none of that fell off but it does seem a little sandy when touched. Is that normal for undercoat?

Is it a sand/cement backing coat rather than a gypsum one.

 

[BoldreChris]

I would say its a good morning's work for a plasterer and they're about £160 per day round here. Add £15 for materials and call it a round £100. No idea about rates in Mansfield, though.

 

[widler]

Id knock it off and dry line it, looks like sand lime mortar to me,its junk,especially after 40 or 50 years.
Also if you pva before over skimming din't let it dry,no good at all, skim when pva is tacky.

 

[Stef]

I would strip that back to the brick work & dryline sheets of plasterboard onto it then you know it should be flat & plumb for tiling.
I've lost count of the jobs I've went to where the peeps have had plastering done & it's all over the place & also cost them a lot more than getting the wall drylined.

 

[Mr T]

whats the best way to strip all that back to brick?

 

[White Room]

whats the best way to strip all that back to brick?

Sds drill/breaker or hammer and bolster.....

 

[Mr T]

sorted be a rite graft with a bolster lol

 

[chrisb1357]

The wife now wants that wall painted and the rest tilled on the bath side. LOL

Going to phone for a few quotes to get that wall skimmed.

Chris

 

[Stef]

The wife now wants that wall painted and the rest tilled on the bath side. LOL

Going to phone for a few quotes to get that wall skimmed.

Chris

Hi, there's a big difference from getting a wall skimmed & getting it flat...
I would drop that back to the brick & dryline it mate.
Sounds a lot of hassle but it ain't..

 

[nybor62]

hi chris ,
you have put this job , in the looking for a tiler section,
the best thing is to let a tiler take a look and he will give best advice, imo i would reboard all the walls, with plaster board
im not far from you , cant give a price with out looking at the job

 

[chrisb1357]

Another member contacted me via PM about coming to also look at this job but I just deleted the PM and did not get his number. Can they PM me again

 

[AliGage]

On another note. What ever you do to the wall sort that unsightly pipework to the radiator at the same time.
Id be inclined to reboard myself.

 

[chrisb1357]

The plan is to remove the radiator and pipes and to fit a towel rail. The pipe from celling for the soil stack we want to box in.

To fix boards to that wall would it be done by fixing battens to the wall first then the boards to them or do the boards fix direct to wall.

Chris

On another note. What ever you do to the wall sort that unsightly pipework to the radiator at the same time.
Id be inclined to reboard myself.

 

[AliGage]

Boards will be fixed using dryline adhesive. Once the wall has been prepared. You could batten and board if you wish but would be more time consuming and more expensive.
Build the box work frame before boarding though.

 

[Mr T]

that's what i would of suggested too.... would he have to take it back to the brick first? my opinion would be yes

 

[AliGage]

Really it depends on the condition of the render that's there. No point removing anything that's sound.