Laying 80m Of Hardie Boards (concrete)

[ChiversTiling]

Alright pro tilers

Have a question for you all

Had a look at a job that involves building up a area of 80m for a floor to bring up the height to the other floor, the client has got that hardie 12mm concrete boards, will it be alright to prime the floor and use flexible adhesive to stick the boards down?

 

[macten]

Hardie isn't designed for that.
SLC is the quicker, cheaper and correct method.

 

[Andy Allen]

Cost a fortune in slc ....why not screed it?

 

[widler]

Yes you can use hardie for that, I don't see a problem, especially if he has bought it

Sorry,just seen your post macten, why can't you use it ? Just exactly the same as boarding a floor and tiling it, ain't it ?

 

[J Sid]

Cost a fortune in slc ....why not screed it?

If no special requirements are need, ufh etc for slc, then there would be not much difference in cost to raise floor up 12mm.
SLC could work out cheaper when you take into account adhesive and fixings for boards.

 

[macten]

Yes you can use hardie for that, I don't see a problem, especially if he has bought it

Sorry,just seen your post macten, why can't you use it ? Just exactly the same as boarding a floor and tiling it, ain't it ?

I asked the same question to my local Hardie rep many years ago when I wanted to increase just a small area and I was told no.
He said it was designed for timber substrates and they don't guarantee fixing to concrete.
I've just checked their website and this is still their position.

 

[widler]

Ican't understand why, bit weird , cement to cement will be fine, if its that anal stuff then i could understand , and oh bugger, ive done it a few times

 

[macten]

I'd need to check but I'm sure NoMorePly don't have a problem with it.
I'm sure SLC would still be much quicker and cheaper.

Edited to add that NMP can be used like this

 

[Andy Allen]

How big the area?
20kg bag of Weber slc covers 6 m2 at 3 mm. ...so to build up 80 mm your going to need a fair few bags..

 

[widler]

He aint said 80mm andy, he said 80m, and it looks like 12mm