Hardie backer PDF

[Ian]

I was just having a look at the installation PDF to brush up on a couple of things, just thought I'd post it up incase anyone fancied a read. It was updated in July 2012.

http://www.jameshardie.co.uk/images...ent_backerboard_installation_guide_manual.pdf

 

[White Room]

Allways worth a good read.....

 

[Ian]

I had a blank and couldn't remember if they advised sticking with non-flexi or SPF, turns out non-flexi is advised. Always good to keep up to date with the technical side of the trade

 

[The D]

I was chatting to the rep the other day about the 100 KG and he said it had been tested to 4 ton :yikes:

 

[The D]

I had a blank and couldn't remember if they advised sticking with non-flexi or SPF, turns out non-flexi is advised. Always good to keep up to date with the technical side of the trade

is that on to ply??

 

[White Room]

A non-flexi to a timber floor ?

 

[Ian]

is that on to ply??

A non-flexi to a timber floor ?

Yeah, 15mm ply or 18mm chip board onto joists spaced no further than 600mm apart. Schluter recommend a non-flexi for sticking ditra down, even over UFH that's what made me look.

- - - Updated - - -

From page 2 on the PDF.

 

[The D]

Yeah, 15mm ply or 18mm chip board onto joists spaced no further than 600mm apart. Schluter recommend a non-flexi for sticking ditra down, even over UFH that's what made me look.

- - - Updated - - -

From page 2 on the PDF.

i use spf looks like i need to give them a call

 

[Perry]

Good at least they don't say it's waterproof you need to tank it unlike aqua board

 

[White Room]

That surprises me to use a non-flex.....

 

[Ian]

i use spf looks like i need to give them a call

So do I Deano, I can't see it being a problem, would be nice to know what the difference is though.

 

[White Room]

i use spf looks like i need to give them a call

Ditto.....

 

[Gazzer]

Always used SPF !

 

[Rookery]

Me too.

 

[Peter]

Odd, was just reading it and that caught my eye. Wonder what the thinking is behind it?

 

[High Peak Tiling]

Thanks Bri

 

[beanz]

That doesn't make sense to me!?! Surely, when the wood expands and contracts, a non flexi would crack, and de-bond!?! Or are they saying to use non-flexi on top of the Hardie? As you can probably tell, I haven't bothered looking at the .pdf yet.. 😀

 

[The D]

The adhesive is not a fixing for the boards it just allows foran even installation the screws are the fixing system

 

[beanz]

The adhesive is not a fixing for the boards it just allows foran even installation the screws are the fixing system

Ah! Very true... Hadn't thought of it that way. 😉

 

[Stef]

Anyone here tried to rip Hardie back up?
I have & I can tell you one thing, the adhesive certainly sticks the Hardie down.
I have always used flexi to stick the boards down & couldn't believe how hard it was to come up.

 

[Sean Kelly]

I have always used spf and wiped the back of the boards with a damp sponge to clean off dust.

 

[Ian]

I hope everyone peels the stickers off the back before fixing, if only they had reward points on them :lol:

 

[Bradma9]

Has anyone got the hardie backer knife/ scorer if so is it any good?

 

[Gazzer]

yeah they are fine, good for grout removal too if you dont slip.

 

[Ian]

Has anyone got the hardie backer knife/ scorer if so is it any good?

Good on the 6mm, I use a grinder on the 12mm it would take ages to score deep enough into them to get them to snap.

 

[Bradma9]

Iv always used a grinder in the past but may have to make a purchase!

 

[Gazzer]

It wont break the bank !, I must have 4 or 5 in my tool box.

 

[Bradma9]

I just havnt seen them, tbh where I get the hardie they rarely have enough bags of screws net alone tools lol

 

[andy8758]

I always try and use the Hardibacker scorer (got 2 from reps at Trade Days - they last well too) even on 12mm board because I would rather score a dozen times than generate the dust that grinding causes.

 

[macten]

I had a blank and couldn't remember if they advised sticking with non-flexi or SPF, turns out non-flexi is advised. Always good to keep up to date with the technical side of the trade

I was told by Hardi that the only reason they recommend non-flexi is because it's cheaper and it's the screws that are primarily used for the sticking and the adhesive is used purely to remove any voids. So no problem using either.

 

[Ian]

I was told by Hardi that the only reason they recommend non-flexi is because it's cheaper and it's the screws that are primarily used for the sticking and the adhesive is used purely to remove any voids. So no problem using either.

The hardie rep has been on here and said exactly that mate, I'll have to have a look for the post. It seems daft to use 2 different types of adhesive, that's why I use SPF for sticking the boards and then the tiling.