Best preparation for pink plaster wall that is uneven?

[STEVEROG]

I will shortly be installing a quadrant shower enclosure in the corner of my bathroom. I have clad one wall with AQUAPANEL which is absolutely flat and level. The other wall is pink bare pink plaster (I sanded off the paint).

I was going to simply prime the pink plaster with MAPEI primer G and crack on with the tiling but I put a long spirit level across the wall and it is quite uneven (up to 10mm lumps and holes. I believe it will be easier to tile onto a flatter surface but I am not sure what the best approach is to get this wall flat. Can anyone tell me the best method and the materials to use? or maybe I need to get a plasterer in to skim it?

Thanks

Steve

 

[DHTiling]

Hi steve,,

What tiles are you using..?

 

[TT Tiling]

hi i would over board it if you can ,but skim is cool ,i would still seal the skim thats there with your primer-g first

 

[diamondtiling]

hi i would over board it if you can ,but skim is cool ,i would still seal the skim thats there with your primer-g first

Skim is only ok if the tiles are a certain weight, over board is a better option.

 

[doug boardley]

you wont build skim out 10mm Steve! personally I'd be hacking it off and re-lining it, with either cement board or plasterboard.

 

[Aston]

if the tiles you are using fall within the weight ratios and plastering is your prefered option then i'd...

give the wall a good rub down,
give it a coat of sbr primer, mabe 2 inplace of pva. leave it to dry a few hour, preferable overnight.
then put on a nice tight coat of carlite bonding around 8mm to build it out and then around 3-4 hours later, skim it, so it all goes off nicely together...

but if it was my choice and theres enough room, id overboard with a nice thin wedi board ....waterproof, thermally efficient and strong to tile to!

ed

 

[Diamond Pool Finishers]

me to mr aston

 

[doug boardley]

if the tiles you are using fall within the weight ratios and plastering is your prefered option then i'd...

give the wall a good rub down,
give it a coat of sbr primer, mabe 2 inplace of pva. leave it to dry a few hour, preferable overnight.
then put on a nice tight coat of carlite bonding around 8mm to build it out and then around 3-4 hours later, skim it, so it all goes off nicely together...

but if it was my choice and theres enough room, id overboard with a nice thin wedi board ....waterproof, thermally efficient and strong to tile to!

ed

only problem there Ed is that you're adding extra weight to a skimmed surface, unless you mechanically fix it.

 

[Aston]

true doug...if they are prepared to hack off and start again, then that would be an even better route

ed

 

[doug boardley]

tbh Ed, for the hassle it takes to hack off, which I think is negligible, it's the route I take 9 times out of 10

 

[2020Tiling]

just thinking ,,,wot would you do if it was a full wall and had a chemical damproof injected into the wall ? would it be ok to dot and dab boards and would it affect the DPC ?

 

[STEVEROG]

Gents,

Thanks for the information thus far.

Some more information:-

Tiles are porcelain 600mm x 300mm x about 9mm thick. A pack of 9 tiles weighs 23kg so its 3.83kg per tile.

The wall is cement render onto brick with a standard pink plaster finish coat. Not sure how well anything is keyed to the stuff underneath?

I could hack the plaster and render layer off back to the brickwork but I believe that if I want to put an AQUAPANEL on to the wall it needs to go onto battons (Knauf say its a total no-no to dot and dab the stuff). Battoned aquapanel is going to build out the surface way beyond the normal wall and look nasty. Not sure about the wedi board stuff? Can I just plug and screw this stuff direct to the wall?

Steve

 

[doug boardley]

just thinking ,,,wot would you do if it was a full wall and had a chemical damproof injected into the wall ? would it be ok to dot and dab boards and would it affect the DPC ?

does that not just coat the inner blockwork in the cavity tho'?