Laying large format ceramic wall tiles

[aspley]

Hi Guys...Some advice pleeeeeeeeeeeeeeeeeease with regard to laying 900 x 300 large format ceramic wall tiles in particular, what preperation is required and what adhesive is recommended.
The location is a bathroom in a new build. The walls are skimmed plasterboard onto which has been applied two coats of Leyland latex matt emmulsion.
Is the fact the walls have been painted an issue?

Thanks for any input

 

[doug boardley]

the fact that your walls have been skimmed may be an issue. Can you find out the weight per square metre for us Aspley, that way we can advise you more fully!
Doug

 

[aspley]

I do not have that information to hand Doug but will try and find out 2moz. Is there an issue with the painting of the walls do you know??

 

[White Room]

Sometimes the moisture in the addy can bubble the paint and release it from the walls

 

[Olz]

You will need to check that the paint is bonded solidly to the wall, get some duck tape and stick it on the wall, leave it overnight and peel it off in the morning, if the paint stays on the wall its ok, if it sticks on the tape and peels off the wall then youll need to remove the paint, use a sander to sand back to the plaster.

Youll need to make sure that the tiles dont exceed 20 kg/m2 taking into account that the adhesive and grout will take up about 4 kg/m2 so the tiles shouldnt be more that 16 kg/m2.

 

[doug boardley]

being quite large format albeit ceramic and not porcelain, they'll probably be at least 10-12mm thick hence pushing up the weight to past 16kg. There'll probably be 3 in a box Aspley, so jump on your bathroom scales with a box and see what they weigh. If there's 3 in a box it's a little bit less than a m2 but it will give us some idea what they weigh!

 

[davy_G]

Dont use tubbed gear or it might never dry. Use powdered gear, spf.

 

[White Room]

I'de be using mapei keraflex maxi which will give you a maximum bed of 15mm

 

[aspley]

If there's 3 in a box it's a little bit less than a m2 but it will give us some idea what they weigh!

Doug.................the box of six weighs 35kg i.e.20kg per metre

 

[bigandy]

for me your tiles will be too heavy for your skim plaster, esp with the weight of the tiles and adhesive.few options here remove the skim and tile away. remove the plasterboard and re board, possibly using a cement board (they will take more weight) or mechanically fix new boards over the existing into the substrate either battens or wall.but would still be looking at using powdered addy with that weight