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Cheers Steven, well they give negligible additional strength but thats why I use 12mm ply underneath, however as ppl are happy to go straight over well fixed f/boards with hardie and tile over then seems way forward. Key is obviously that you are happy with rigidity of f/boards 1st and yes hardie will add a bit because of their inflexibility but they don't claim that as a benefit.I'm not a great fan of thermal boards (I use them in certain circumstances) as I feel that Hardie gives a bit more strength to the floor.
Hardie state that their boards offer no structural strength but it doesn't feel like that.
Yes the Hardie boards can be a pig to work with, ie cut but they are easy to lay & I've never had a failure with them.
Good you are busy pal hope you get the right standard of help you need soon, cheers.