Hardibacker board

[M D HUGHES]

I'm going to lay a floor (floorboard and concrete, check other post) onto Hardibacker board. It seems my best solution to keep levels the same.
Anyway, the joint inbetween the concrete and the floorboards, still need to be a silicone joint to allow for movement? or as I'm using the Hardibacker right through will I not need to bother?
I'm figuring yes I will need to as some of the boards are still going to go onto timber.
What you reckon?

 

[Concept PHT]

Yes, to be safe. I would put a movement joint in across the top too (between the tiles).

 

[Leatherface]

Yes I agrree - you would be as well using a proper Schluter expansion joint- see Schluters website or most reputable tile shops

 

[M D HUGHES]

looks like the Schluter website is down, anyone else finding this?