Hi. I would usually fix hardibacker with stud but I can't in this case as the boards will come out to far over the already fixed shower tray. So my question is 'Can I fix them with tile addy and if so whats best to use? Cheers in advance Ross

Hardiebacker in my experience is not flat and requires mechanical fixing to help pull it straight.

i'm with grumps but know there is a hardi rep /tech on here somewhere

Hi Grumpy,

Can i ask what you mean by mechanical fixing?

Cheers,

Nick

i can answer for grumps(i hope thats ok grumps). he simply means screws which will pull any slightly curved boards back in line with studs whereas an adhesive would only stick it in the shape of the board

ok thx for advice guys.

I know that PL premium is a good adhesive for sticking CBU (it is a polyurethane subfloor adhesive and comes in the large format caulking tubes).
I typically use it on the corners as it is waterproof and strong.
Down side is the long drying time, although it will adhere to damp or even wet materials.
I also run a bead on the stud if there is no vapor barrier as it bonds the board really tight when used with screws.
When dry the job rings like a bell when tapped rather than rattle.
You should use spf when bonding it as a subfloor.

does it need adhesive as well as screwing down? can it be tiled straight away ?

hardi-backer say glue and screw and you can tile straight away they say 6mm for floors when used with 2part flex and 12mm for walls..send for fixing guide or
e-mail www.JamesHardieEU.com
free phone 0800 068 3103 for tech

hey malcolml 6mm on floors and 12mm on walls, sounds back to front doesnt it

Originally Posted by marc1106

hey malcolml 6mm on floors and 12mm on walls, sounds back to front doesnt it

No..malcolml is right....

yeah i know! just doesnt sound right does it dave?

it's a funny old thing the way it works out with thicknesses but such is try not to buy the scoring knife not worth the money in my humble opinion
WARNING +++++ WEAR A MASK WHEN CUTTING MANUALLY++++
BE SAFE

I have the scoring knife Malcolm, I find it does a good job. It is still going strong and I have cut a lot of sheets with it. it also does a fine job as a tile scribe too!

never found it worked well for me but i like the idea of using it as a scribe bonus idea

Just a quick note to this thread if anyone is really struggling with Hardibacker we have installation instructions in branch and will quite happy to furnish you with it.

when are CTD gonna open a store in Kendal, Hobbit

Originally Posted by doug boardley

when are CTD gonna open a store in Kendal, Hobbit

Not enough Tilers in Kendal to open a branch Doug mate

I have found that using a stucco rasp to smooth the rough edges is invaluable as when you snap it there will be roughness. So a quick bit of work with the rasp and it is a nice clean edge.
I install lots of hardibacker and prefer it to the wonderboard or durock.
Don't be scared to put a few extra studs in key places (vertical and crossbracing) to make the fixing easier and use PL polyurethane or whatever equivalent you have in the UK behind on the wood just prior to placing the piece, that is, unless you are using vapor barrier behind.

Originally Posted by doug boardley

when are CTD gonna open a store in Kendal, Hobbit

The problem we have Doug, is with us being a distribution company we would be treading on our customers toes so to speak.
We have a few companies who sell our products in Kendal.
If we open too many branches we would go from a distribution company to a retail company like topps.
Anyway i hope everyone had a great xmas and new year!!!
Hope we all have a better year than the last !!!