what type of backing board is best

[paul westcott]

ok ill tank around the shower and bath part for extra protection. Looks like i'll be going with 12.5mm wall boards but as some of the walls are not 100% i will probably have to dab n dot to get a good level and then mechanical fix. So ive been leaning towards the Marmox boards as they seem lighter the the hardibacker or aquaboard and it says you can dab and dot with the Marmox board but not with the others and then fix using their dowel pins where i have but the dabs.
Does this seem the right way to go ? also do i need to seal the block i will be fixing boards to and do i just use tiling adhesive for the d/d.
Appreciate all your advice,thanks again

 

[Time's Ran Out]

Just use Wedi/Jackoboard and save on the tanking, just the joins and corners.
Take more surface weight then any of the paint on products.

 

[paul westcott]

If i use plasterboard on a couple of the walls not in the wet area will dab and dot be strong enough to hold all tiles or would it also need fixing to the wall with some sort of fixing for extra strength, I will be using 600 x 300 tiles 10mm thick (worked it out to roughly 23-24 kg per sq mt and do i need to prime the blocks first? Ive decided on the Marmox boards for everywhere else as they can be dab n dot to help level the wall a bit and fixed with the dowels afterword but would save a bit of money if i plasterboard the other areas.
Thanks

 

[Waluigi]

The only time you need to mechanically fix plasterboard to a block/brick wall is if it’s the insulated board which require just two fixings to comply with the fire regs

That said, it won’t do any harm.

 

[Waluigi]

No need to prime the blocks unless they are very dusty. Which then might need a watered down PVA.

Remember- you don’t use tile adhesive for the plasterboard, you use Dri-wall Adhesive.

 

[paul westcott]

Thanks for the quick reply Waluigi is there any specific fitting to use?
edit posted before your last reply, yes will use dry wall adhesive thanks for the heads up ..what about taping the joints would i do it the same way as the backer boards?

 

[Waluigi]

Orbry 50 Stainless Steel Tile Backer Board Washers - https://www.tilefixdirect.com/product/ALSBW50?gclid=CjwKCAjwmdDeBRA8EiwAXlarFhcWMr2rvwoAc9KouIlPAlibzXx3XGxuVd7B-MyggNrXz9RAGZxa1BoCZXMQAvD_BwE

 

[paul westcott]

Thanks again...out of interest i'm using the spankers to fix for the Marmox board could i use them on the plaster board as well done the same way

 

[Waluigi]

In my experience, I just use a large flat wood bit and use them on the plasterboard just to take the paper face off and a millimetre or two off the board so that the washer sits flush/recessed.

They don’t bite in on plasterboard like they do on the foam board.

 

[paul westcott]

I'm probably being really thick here, but if i use the washers in the link how do i get the wall plug into the wall after the wall adhesive has dried. Do you just drill the hole big enough for it to go through the board say 10mm hole and the washer holds the board in place..sorry if it sounds like a stupid question..