Recommendation: fixing hardibacker on tng

[nik73]

hi everyone need advice fixing hardibacker on tng in upstairs bathroom. I was going to make sure the tng was solid ist before screwing down the hardi on top is that right !!or do i need to put a flexible powder base on top of tng and then fix hardi on top of that!!! ime gona be using bal rapidset FLEXIBLE!! any advice would be great thank you

[Dave]

You got it..adhesive first..then hardi....but check with adhesive manufacturer to check there suitability for use with hardi..

[nik73]

You got it..adhesive first..then hardi....but check with adhesive manufacturer to check there suitability for use with hardi..

thanks dave for advice ime going to use the bal rapidset flexible .

[Dave]

Check with BAL for recommnded thickness of hardi...they don't recommend the 6mm one like hardi does...

[cornish_crofter]

Why not remove the tng? The chances are you'll find battens behind, then screw 12mm hardibacker to that.

[wetdec]

http://www.jameshardie.co.uk/pdf/ins...eBacker500.pdf


tiler

[P'boro tiler]

Why not remove the tng? The chances are you'll find battens behind, then screw 12mm hardibacker to that.

you mean the joists?? thatll fail in no time. you need 25mm ply over normal joists

[nik73]

Why not remove the tng? The chances are you'll find battens behind, then screw 12mm hardibacker to that.

i was thinking of that but thought might be creating more work but makes sense tho cause then it wont be so raised ! does the hardi need primer before laying . thanks cc

[nik73]

you mean the joists?? thatll fail in no time. you need 25mm ply over normal joists

thanks for that i was nearly up there cutting them out !!

[Dave]

Hardi doesn't need priming..just a wipe over with a damp sponge...

[cornish_crofter]

you mean the joists?? thatll fail in no time. you need 25mm ply over normal joists

OMG! We're talking FLOORS here aren't we

Sorry I thought we were talkign walls, and the T and G was panelling!

I'll just go and sit in the corner and not speak - probably best

[nik73]

http://www.jameshardie.co.uk/pdf/ins...eBacker500.pdf


tiler

Topman thanks

[whitebeam]

Try this one as well https://www.pureadhesion.co.uk/store..._Technical.pdf

[nik73]

Try this one as well https://www.pureadhesion.co.uk/store..._Technical.pdf

thank you whitebeam big help.

[Branty]

This is the one for floors.
http://www.jameshardie.co.uk/pdf/ins...eBacker250.pdf

This is quite good too.
http://www.jameshardie.co.uk/pdf/ins...r_On_Floor.pdf

[Branty]

Try this one as well https://www.pureadhesion.co.uk/store..._Technical.pdf

Couple of discrepancies there.
15.8mm ply subfloor?
400mm joist spans?

[nik73]

This is the one for floors.
http://www.jameshardie.co.uk/pdf/ins...eBacker250.pdf

This is quite good too.
http://www.jameshardie.co.uk/pdf/ins...r_On_Floor.pdf

thanks branty for that 1 .

[P'boro tiler]

OMG! We're talking FLOORS here aren't we

Sorry I thought we were talkign walls, and the T and G was panelling!

I'll just go and sit in the corner and not speak - probably best

lol, dont worry about it. i didnt want to seem rude, i just didnt want the guys floor to fail!

[brian c]

i used hardi backer for the first time this week and with guidance from Gaz and Dave it worked well.I found that it was easy to work with and quick to install and if i had used ply it would have taken longer and wouldnt have been as flat and level as my floor is with the hardie backer board.All in all i think i will be using this instead of ply in the future.

[malcolml]

bal recommend fastflex for hardi-backer 6mm on any floor surface
fix the hardi-backer with fastflex and then screw to floor for added strength,for fixing tiles use fastflex then grout using a flexible grout (you can use a gt1 ad-mix with the grout)

[graham31]

i used hardi backer for the first time this week and with guidance from Gaz and Dave it worked well.I found that it was easy to work with and quick to install and if i had used ply it would have taken longer and wouldnt have been as flat and level as my floor is with the hardie backer board.All in all i think i will be using this instead of ply in the future.

Was their much difference in the cost Brian?

[Holohana]

Guys you need to remember that as you are not using Hardibacker as a board to add strength to the floor, ie there is less than 3mm deflection over 4m, then you can use single part flexible above and below the board.

However BAL wont guarantee their products unless you use 2 part.

Hardiebacker does not add strength to a floor with movement. It provides a level water resistant background to tile onto.

A minnimum 15mm ply would need to be used on top of the floorboards prior to Hardibacker to ensure you have no issues if the T&G floorboards are moving greater than the 3mm.

Hope that helps.

Andy

[atec]

i agree with holohana, i believe you still need to put ply down below the backer. would be interested to hear if its been put down without ply and has been ok.

[Branty]

Guys you need to remember that as you are not using Hardibacker as a board to add strength to the floor, ie there is less than 3mm deflection over 4m, then you can use single part flexible above and below the board.

However BAL wont guarantee their products unless you use 2 part.

Hardiebacker does not add strength to a floor with movement. It provides a level water resistant background to tile onto.

A minnimum 15mm ply would need to be used on top of the floorboards prior to Hardibacker to ensure you have no issues if the T&G floorboards are moving greater than the 3mm.

Hope that helps.

Andy

So you're saying that Hardibacker should used over 15mm ply overlay, to take a single part adhesive? if so, then all single part adhesives will be fine.
Do you recommend fixing the backer board to the ply with tile adhesive, or fixing with screws.

[brian c]

Was their much difference in the cost Brian?

Yes,Hardi is more expensive,it would cost you nearly double opposed to the price of plying out,but it has its benefits.