Bathroom renovation help please

[granthathaway]

Hi there, i am in the process of converting my old toilet/bathroom into one room ("family bathroom"), and am after some advice regarding the best methods to get the best results. I have knocked down the internal block wall between the two rooms, bricked up the unwanted door, and have gutted the rooms back to the existing plaster etc etc. I have chased in new wiring where required, skimmed the celing and have bonded all recesses so the walls are somewhere near level. What is the best thing to do next regarding tiling?

All walls are solid brick (not stud) and have been bonded and skimmed. As some of the walls have been skimmed and are in good condition, i was going to skim the remainder of the walls to get a good level to tile on.

The tile adhesive i have says that no primer is required and not tile onto backing plasters/bonding.

Should i use a primer for piece of mind?

I am going to fit a P bath so i can fit an electric shower above. Do i need to take extra waterproofing preacautions such as tanking in this area, or will a primer and waterproof adhesive be sufficient?

Also, the tiles my missus has chosen are 450mm x 316mm x 9mm (spirit marfil) ceramic wall tiles. Is this too much loading for the finishing plaster? What makes me think i might get away with the tile, is the the old tiles i took off were of a similar size. But, if the loading is too much, is the easier (and probably cheaper) option to change the tile?

Ideally, i wanted to stay away from backer boards etc as the room is not very big as it is, so wanted to keep the room as big as possible to maximise space etc.

The floor will also be tiled. I intend to use 6mm ply screwed down onto floor boards. Again, is this sufficient, and do i need to take any extra waterproofing precautions?

Sorry to go on, i just want to get it right as i want the bathroom to last.

Many thanks

 

[charlie1]

I'm always wary of tiling on plaster no matter how straight it looks, get a 2m straight edge over the face of the plastered walls to see what they are like, should be no gaps greater than 3mm, if there are then tell us how much and e can advise on course of action. As for your floor, 6mm is not deep enough, best course of action would be remove floor boards, install noggins and overboard with 18mm ply then 6mm backer board.

 

[granthathaway]

the walls are fine - level wont be an issue. i must have plastered it better than i thought!

 

[cam_low]

How big is the floor area?
You need to check the floor is deflection free at floorboard level first, if not, screw down where needed. Once this is secure, prime the floorboards then glue and screw 6mm cement boards ie hardie backer to the floorboards. This will give you a good surface to fix to.


What adhesive have you got for the walls? Stay away from premixed stuff.(I'm assuming this is what you have bought and looking back at your tile choice it is oversized for ready mixed anyway, however load is ok.)

Cementuous is the best and, yes, prime the walls with an acrylic primer such as bal primer or ardex p51 1:3

the tanking decision is up to yourself. Most customers who don't use backer boards prefer to tank so this would have been an option I would have presented to you.

good luck.

 

[granthathaway]

thanks, the floor area is approx 4.5m2 and i have cement based tile adhesive for the floor tiles. The adhesive i have for the wall tiles is granfix multifix (in 10L tubs) - it is a thin bed adhesive that says it's compatible for large format tiles. can you suggest/recommend a cementuous adhesive and does it need to be thin or thick bed? and how much would i need for 17m2? many thanks for your help

 

[charlie1]

Your tile adhesive for the walls can only be applied in a thin layer (3mm bed) i think you will need a thicker bed with plastered walls (8-10 mm notch) that will give you around 5mm bed. Mapei p9 or Webber equivalent would be my choice. If the walls are really bad then mapei kerra flex maxi, all these adhesives are cement based.

have you tiled before?

 

[Brian the Tile]

your wall adhesive is agood choice ,one of the best on the market imo

 

[granthathaway]

ok, just to clarify:

the wall tiles are 416mm x 315mm x 9mm ceramic - will this exceed the weight limit per m2 for plaster with adhesive and grout? reading through posts i know that the weight limit for plaster is 20kg/m2, and i think using 9mm tiles will roughly give me at least 23kg/m2.

is it best to play it safe and choose a thinner tile to bring me within limit? I've found a 5mm thick tile which we like just as much (dakar ivory 250mm x 400mm x 5mm)

I will prime the walls first and tank the shower/bath area

I will use a cement based adhesive with a thicker bed as i'm tiling onto plastered walls.

Is this correct/ok?

sorry to keep on, i just want to get it right. many thanks for any/all help.

 

[charlie1]

Don't worry about the weight, i once saw 15mm thick stone tiled to plaster and it stays on ok, i would have no worries tiling that

 

[cam_low]

Don't worry about the weight, i once saw 15mm thick stone tiled to plaster and it stays on ok, i would have no worries tiling that

you have got some daft ways of advising the GP

 

[charlie1]

Please explain cam??

 

[cam_low]

BS weight guidelines are in place for a reason, that gives the impression to the GP that fixing 15mm stone to plaster is ok.

 

[charlie1]

No, id never fix 15mm stone to plaster, but i don't think i would have any problems fixing ceramics to plastered wall dependant on other factors. Your out of line with your cheeky post above, especially considering your obvious limited experience

 

[cam_low]

I think you want to take a hike son you know nothing about me and you bite way too easily, especially after last night hahaha

 

[charlie1]

I think you want to take a hike son you know nothing about me and you bite way too easily, especially after last night hahaha

now now Cameron, i know your main experience of tiling is selling them?