Chipboard, Hardie backer primer!

[STEvieXE]

Hey guys think I may be about to make a boo boo!

I am tiling a chipboard floor, firstly over boarding with Hardiebacker. I have cut all the Hardie, hoovered the floor and just primed the floor with neat primer g.

While waiting on the primer g drying (having lunch) I was just reading over the data sheet and I'm not sure its a suitable primer for my job.

Can anyone shed any light on this? And if its wrong must I remove it or just prime over with a more suitable Primer?

 

[Stef]

What adhesive are you using?
I take it it's a Mapei?
Make sure the primer doesn't skin, it's years since I've used primer G but I'm more than certain I've used it neat without a problem.
You can prime the Hardie once fitted but you don't have to, you can wipe it with a cloth or sponge but I prime everything I tile.

 

[STEvieXE]

Keraflex maxi is the adhesive so am I good to start?

 

[STEvieXE]

My post maybe confusing but I am talking about priming the chipboard before overboarding

 

[Stef]

That's what I was meaning, you must prime the chipboard before sticking adhesive to it.
You may be getting mixed up with priming Hardie as they say you don't need to but as I say I prime everything I tile.

 

[STEvieXE]

So is primer g suitable for the chipboard?

 

[Stef]

So is primer g suitable for the chipboard?

Yeah, as long as it hasn't skinned on the surface it will be fine.

 

[Tile seller]

As stated above,primer g needs to be watered down so that it absorbs into the substrate material, as apposed to sitting on the surface like a skin. So,as long as its soaked in all's fine. You can use it neat so long as the substrate is porous enough for it t soak in.

Keraflex maxi doesn't look to be a recommended adhesive onto chipboard by Mapei. Keraquick with latex plus would perhaps be better. Looks like Mapei like an s2 to be used with chip board.

 

[Dave]

If you are boarding with hardibacker , then adhesive doesn't have to be S2 etc , it's simply to take up voids , the screws hold it in situ. Then you tile with suitable adhesive.

 

[Stef]

If you are boarding with hardibacker , then adhesive doesn't have to be S2 etc , it's simply to take up voids , the screws hold it in situ. Then you tile with suitable adhesive.

As Dave says, it doesn't even need to be a flexi for fixing Hardie.
I always use a flexi for wooden substrates as it sits better in me head.

 

[Dave]

As Dave says, it doesn't even need to be a flexi for fixing Hardie.
I always use a flexi for wooden substrates as it sits better in me head.

Me too.

 

[STEvieXE]

Thanks guys for the help, sorry for a stupid question BUT

When u mean skinned do you mean like a skin on top? Or dried in?

Primer g says on instructions tile when completely dry?!

 

[Old Mod]

Yeah they mean like a skin on top that hasn't been absorbed by the substrate, in this case your chipboard.

 

[STEvieXE]

Mine was well soaked in and dry so hopefully that's OK! Thanks chaps

 

[STEvieXE]

On the layout side of things its a small ensuite I'm tiling less than two square metres. Too keep my 330 square tiles centralised down the length of the room I'm left with one full tile and one 281 cut either side. In the door jam tho the door closes right at the other end of it so I need to tile into it which means ill have a 106 cut as I walk in made smaller looking by the finishing trim when its fitted. I think this will look OK but I know you guys hate small cuts! What do u think?

Only other way I can think is to knock the floor off centre to make a bigger cut from the doorway