Hardiebacker

[macten]

Hardi rep told me if primed it is totally water proof and suitable for wet rooms (assuming joints are sealed).
Not done it myself but that is what Hardi say.

 

[Flintstone]

By primed, he must mean tanked

 

[hmtiling]

Nmp primed, with their primer, is also waterproof or so I've been told

 

[Flintstone]

lol

 

[macten]

It wasn't the Hardi rep it was the NMP rep -I get them mixed up.
Insisted with their primer NMP is perfect for wetroom installations.

 

[hmtiling]

It wasn't the Hardi rep it was the NMP rep -I get them mixed up.
Insisted with their primer NMP is perfect for wetroom installations.

i wouldn't trust it though and doesn't say it anywhere,that i can find, in their bumf.

 

[One Day]

It wasn't the Hardi rep it was the NMP rep -I get them mixed up.
Insisted with their primer NMP is perfect for wetroom installations.

"perfect" as in "completely unsuitable"?

 

[Stef]

It wasn't the Hardi rep it was the NMP rep -I get them mixed up.
Insisted with their primer NMP is perfect for wetroom installations.

I've not used nmp but it's basically the same as Hardie, a cement board.
There is no way that is deemed waterproof using their primer.
The only boards that are waterproof are the poly extruded ones ie marmox, wedi etc.

 

[SJPurdy]

I've not used nmp but it's basically the same as Hardie, a cement board.
There is no way that is deemed waterproof using their primer.
The only boards that are waterproof are the poly extruded ones ie marmox, wedi etc.

from "no more ply" document:

 

[SJPurdy]

"To make NO MORE PLY boards completely waterproof, coat the completed NO MORE PLY surface with two coats of SBR primer (one part SBR to three parts water)."
I've done this in the past and not worried about it but I did like to use a secondary tanking tape in critical corners to back up the glued joint.
However I would always go for Wedi in preference to it on walls for the reason given in my earlier post.

Sorry my post got split (finger on keys trouble)!!