Hardiboard on the floor

[HollyTree]

Hi all,

just bought an old 1930 house and the hallway floor is all over the shop !!

i was thinking of screwing the floorboards down

9mm ply then glue and screw the hardiboards down as suggested in this \/

Am about to take on my first tiling job and am throwing myself in the deep end with a load of natural stone (marble and granite).


It's kitchen and bathroom on a first floor, so wooden subfloor. I'll screw down the existing boards and plywood of course, but have bought 6mm Hardibacker to go over it too. Need to fix that tomorrow. I was going to screw it down with Screwfix's 25mm Turbo screws but I know you need to put some mortar or 'thinset' between the Hardibacker and the wooden subfloor. Can I use a weak mortar for this (5ish to 1?), or do I need to use tile cement? If so, can I just use some cheapie stuff, or should I use the Keraquick+Latex I've got for on top? The tile sizes are a 50x50x12mm marble mosaic in the bathroom and then 305x305x10ish mm granite in the kitchen.


Thanks,
Chris
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then could I screed onto this with a self levelling compound?

thanks

 

[White Room]

Are you doing this work at your own home...

 

[HollyTree]

Yes I am, I want this to be a solid job.

 

[HollyTree]

Yes this is my own home