Starting From Brick, Plasterboard /adhesive Options

[olly330]

Hello,

I'm renovating my house which recently purchased, bathroom is currently back to brick as the old pb came off with the tiles.

So we are going to dot dab it and use appropriate pb.

Does this have to be waterproof pb all over the bathroom, or just the shower area? Also, does waterproof pb still need tanking in the shower areas or does the waterproof pb in effect have the tanking built in?


Also, I'm regards to adhesive on the walls. Tiles will be going ono fresh pb, defo will not skim.

However, I am reading conflicting information about whether the wall adhesive has to be flexible or not... I read a lot I discussions and no one seems to mention this.

I know for certain that in wet areas we should use water proof adhesive, but I can't find a clear answer on whether the wall adhesive has to be flexible or not?

Other areas around the bathroom such as toilet cubicle/sink we will use bal green star b100 as we are on a budget and can get it for £10 per 15kg tub, is that ok or should we just go for waterproof adhesive in the whole bathroom to ensure no problems down the line.

 

[White Room]

To start there's no such thing as waterproof plasterboard, it all contains gypsum which sucks up water like a sponge.
The green plasterboard is moisture resistant that's all and come's in 8x4's which can be a struggle dragging it through the house, not 6x3's standard board which is far easier to handle.
You can use Wedi, marmox etc 12.5mm for the shower area fixing with the special washers and just tank the joints and standard board 12.5mm for the remaining bathroom.
The adhesive would be water resistant if using a cement based and probably work out cheaper in the long run, single part flexible would be a good choice as it gives you more time to work with.

 

[Flintstone]

The most economical way and right way would be to use normal plasterboard everywhere, then tank the wet area, ideally before fitting the shower tray so you can tank to the floor. Then tile the whole room using a good flexible slow set powder, such as tilemaster setaflex.

 

[Flintstone]

Avoid the buckets of ready mixed.

 

[White Room]

The most economical way and right way would be to use normal plasterboard everywhere, then tank the wet area, ideally before fitting the shower tray so you can tank to the floor. Then tile the whole room using a good flexible slow set powder, such as tilemaster setaflex.

You tank onto the tray otherwise it's worthless....fitting the shower comes first then tank.

 

[Flintstone]

Why would you be better tanking after? Risking a weak spot at the bottom where it meets the tray? Make the whole wall water proof, then put the tray in and Silicon it.

 

[olly330]

Thanks for the replies.

I will go with the bagged stuff then rather than tubbed.

Still not sure as to why flexible adhesive is needed on walls, I can understand on the floor as you walk over it so have movement.

Can anyone recommend a decent wall adhesive that is cost efficient? will be used in bathroom and over bath /shower.

Thanks, Olly

 

[Flintstone]

Most decent adhesive is flexible anyway, and a stud wall may have slight movement.
I can recommend tilemaster, as can many on here, good stuff and easy to use and mix.

 

[olly330]

That helps, so I don't necessarily have to look for 'flexible' on the bag.

Is the below tilemaster stuff ok, and would it be ok for the floors too? It's standard set, and says it can be used for both walls and floors.

Will be putting ceramic tiles on the walls and porcelain on the floors.

Thanks

 

[olly330]

Tilemaster Adhesives - 20kg Standard Set Floor & Wall Tile Adhesive - Grey

 

[J Sid]

how much......£££££ 🙁

 

[Old Mod]

This is better

 

[Flintstone]

Just get the flexi, why wouldn't you !

 

[Flintstone]

You tank onto the tray otherwise it's worthless....fitting the shower comes first then tank.

Can you explain your thought process here!

 

[White Room]

Can you explain your thought process here!

I use Bal WP1 for tanking and roll it onto the shower tray with a fibre matting to hold into place between the wall and tray, it allows for any movement.
Silicon can come away and for me leaves it too open for any water to creep past where fixed to the wall, WP1 is just my way and find it works for me and will stick to that method.

 

[Flintstone]

Your still relying on a seal between the tray and the membrane, a slight leak with that and your water is going down onto bare plasterboard

 

[SJPurdy]

However, I am reading conflicting information about whether the wall adhesive has to be flexible or not... I read a lot I discussions and no one seems to mention this.

Flex added to the description of a cement based adhesive generally means that it has more of the (expensive ) sticky component built into it. This means that a flex adhesive sticks more strongly to the tile and the substrate and can cope with more vibration/movement than a weaker bonding standard adhesive.
In your case as the PB will be fixed onto solid walls there should not be much movement/vibration in the walls that requires the higher strength adhesive to bond to the PB. However if larger format tiles are used or any size porcelain tiles then an adhesive with more sticking power will be required.
Some adhesive manufacturers have an adhesive strength option somewhere between their standard non modified and their single part flex. eg Weber set plus can be used to stick small medium sized porcelain, but to stick larger format porcelain or to stick to a timber substrate the Weber SPF would be more appropriate.
Some other manufacturers just add sufficient extra sticky component to make their standard adhesive suitable for porcelain (small-medium size) tiles.
As stated by others the modified adhesive can be cheaper than the unmodified because (eg) the shops sell more of it! Personally I would want the added strength (and peace of mind) of a modified adhesive (porcelain) even if only fitting ceramic tiles.

 

[olly330]

This is better
View attachment 81304

can i just double check that this adhesive is water resistant as it doesnt say on the product information.
Will be using it in bath and over bath shower area.

 

[White Room]

can i just double check that this adhesive is water resistant as it doesnt say on the product information.
Will be using it in bath and over bath shower area.

Yes it is water resistant.

 

[olly330]

Thanks for all the replies. Been working on other areas of the house but its good as its gives me time to plan out the bathroom properly and ensure everything is done correctly.

Im going to order tiles from tile magic as they are good on price and the adhesive prices seem good too.

Is the below pro flexible adhesive good enough for bathroom walls and floors, including shower area.
I have read the tech sheet, and they say in the description that is is suitable for walls and floors, flexible and water/frost resistant. Seems a good price at £11.51 per bag.

It will be ceramic tiles on walls and porcelain on the floor. Possibly white metro walls tiles which are small and grey medium sized floor tiles.

Also, is the grey colored one ok, I think that as ceramic/porcelain tiles are not porous it doesnt matter what colour of adhesive used?

Its difficult to wonder why the other mapei adhesives are more expensive when this one seems to tick all the boxes.... water resistant, flexible, suitable for both walls and floors....

Pro Flexible Porcelain & Stone Tile Adhesive (Grey) 20kg

 

[SJPurdy]

It will be ceramic tiles on walls and porcelain on the floor. Possibly white metro walls tiles which are small and grey medium sized floor tiles.

Also, is the grey colored one ok, I think that as ceramic/porcelain tiles are not porous it doesnt matter what colour of adhesive used?

If using white grout on the walls I would advise using a white adhesive also.