Ply Vs Osb - Tile Advice

[Kyle Knowles]

Bin doin some reading after speaking to a builder I do some work for and it's got me thinking has anyone got any info on osb being used for overboard floors to fit ditra to as osb comes in tongue and groove so in theory the joints are much stronger than a ply join ?

 

[jobdone]

Never liked osb looks like a weetabix. You can get 22mm ply t & g in 8 x 2

 

[Kyle Knowles]

I'd never even thought about using it till it was brought to my attention but I've bin doin some reading and maybe it could be used it would have to be OSB3 or OSB4 maybe I should fire a email to schluter to check with them if it's suitable

 

[SJPurdy]

Why not use one of the many tile backer board types?

OSB used to be very dimensionally unstable with moisture content.

 

[Kyle Knowles]

It depends on the grade there 4 grades OSB1 OSB2 OSB3 OSB4 it's 3 and 4 which seam to be suitable for the job from my reading
I've mentioned tile backer boards but I think it's gonna be ply or osb

 

[Kyle Knowles]

It would of bin ideal to rip the old boards up and use hardi floor straight over the joists

 

[Time's Ran Out]

It would of bin ideal to rip the old boards up and use hardi floor straight over the joists

Don't think that's a better alternative.

 

[Old Mod]

Don't think that's a better alternative.

Why not john?

 

[Time's Ran Out]

Why not john?

Because Hardie don't recommend it.

 

[Old Mod]

Because Hardie don't recommend it.

What Hardie doesn't recommend fitting Ditra to its structural boards?

 

[Time's Ran Out]

Where does Ditra come in this thread?
I thought the OP was suggesting fixing 12mm Hardie direct to joists.

 

[Time's Ran Out]

It would of bin ideal to rip the old boards up and use hardi floor straight over the joists

QED.

 

[Old Mod]

It would of bin ideal to rip the old boards up and use hardi floor straight over the joists

QED.

Well as your assumption was 12mm backer boards,
My assumption was Hardie 19mm structural boards, as the op mentioned Hardie floor, to me that doesn't read backer board!
And maybe I did make an assumption that he was going to use Ditra.
All I was asking was for u to quantify your statement john.

 

[Old Mod]

It would of bin ideal to rip the old boards up and use hardi floor straight over the joists

Structural Fibre Cement Interior Flooring - HardieFloor

QED!

 

[Time's Ran Out]

Structural Fibre Cement Interior Flooring - HardieFloor

QED!

Well at least the thread has established the fact that Hardie make structural boards as well as backer boards.
Marc 10 v 0 me.

Quod erat demonsrandum