Tiling onto wooden floor boards

[Bradma9]

This is the first I have done with floorboards. As I'm aware that floorboards have a lot of movement do you carry out the same proces as a normal floor ie adhesive/ screw hardibacker board and tile with a flexible addy? ease could people tell me what they do as this is my first floorboard job for a Friends daughter.
Many thanks

 

[Qwerty]

Yes, but I always like to know what is below the floor first and also what deflection present as may need to strengthen between joists. Screw boards down well and then treat as you would ply.