Bathroom walls

[jstrats]

Hello people i have just been to look at a job and the walls are terrible, bumps everywhere, loose skim, skim missing, exposed brickwork in places, some of it rough render.

Tiles are 600x300 porcelain and weigh 19.5kg per m, i told client (decorator friend of mine) to get a plasterer in to sort out the walls for me.

My question is shall i get him to bond it and skim it or to dot and dab some kind of boarding?

Thanks, Jamie.

[Scott]

Go for the dot and dab of new boards. Bonding isnt suitable for tiling and skim isnt strong enough for that weight with the adhesive and grout

[Ceramico tiling]

plaster skim is definate no as it is weak and holds less weight than plasterboard.

[jstrats]

What thickness board is suitable do you reckon? Is moisture resistant board ok? Also shower in corner of room, will prob get him to cement board that.

[Scott]

Standard 12.5mm will be fine for the bulk of the room. Just use the cement board for the weat areas. You cant dot and dab the cement boards though they will have to be mechanically fixed. If the plaster has all blown you will be better off taking it back to the brick/block work

[Daz]

As above, get the walls back to block or stud and D&D / fix plasterboards. Mechanically fix cement or polycore boards for shower area. Alternatively, use plasterboards in the shower area but tank the area before tiling.

[whitebeam]

To all the above, good advise about plasterboard

[jstrats]

Yeah thanks gentlemen will do everything you have suggested.

[doug boardley]

from Scottley down, all good advice

[Polishtradesman]

I would say - never use gypsum or plasterboards in wet areas and ALWEYS tank surface before tiling in wet area (f.e. http://www.mapei.it/Referenze/Multim...m%20wps_gb.pdf). To prepere surface to tile use cement- based compounds like http://www.mapei.it/Referenze/Multim...ivoplan_gb.pdf , then tanking then tile. It is only way for wet areas. It will be ok for years, without fungus. If board in wet area, wedi boards are ok.

[ORTiling]

Ive just finnished a new build that has skimmed studded bathroom walls with 600x300 Porcilain over 20kg per m2 with 12mm notch trowl, it does have backer board in the shower.

Bit concerned about this now, have some more builds to tile soon, should I be recomending they not plaster and dry line the walls and use something else now?

[whitebeam]

You can try and reccomend on sites but sometimes it just falls deaf ears but give it your best shot.

[ORTiling]

You can try and reccomend on sites but sometimes it just falls deaf ears but give it your best shot.

I know exactly what you mean, Ive been tiling for this builder for a long time but they have only just gone away from ceramic on the walls.

Do you think a disclaimer is in order?

I take it we are on or over the limit for weight?

[whitebeam]

Could use this as a guide, have'nt done site work for a few years but worth a mention to the guy whos paying you

Tiles and Adhesive Weight Per Square Metre - THE TILE SOURCE

[ORTiling]

Could use this as a guide, have'nt done site work for a few years but worth a mention to the guy whos paying you

Tiles and Adhesive Weight Per Square Metre - THE TILE SOURCE

Thanks Whitebeam, Tile Source (HT) is my main supplier.

Just want to make sure I dont get comebacks later on!