Wet room floor bottom..upstairs? before lay aquaboard in a damp room space,what do you suggest i...

before lay aquaboard in a damp room space,what do you suggest i lay as a sub floor ,to give the unbroken thing plenty strength to stay still .....we will have to start on floor boards or joist..thanks within advance
How would you cover this deck?
Answers:    raining room floors upstairs is very risky unless you really know what you are doing.
if you dont its going to cost you lots of money when it leak, and it will leak

i enjoy done many adjectives sucsesfull. if in doubt use a low horizontal tray or seek a honest tradesman the best you can get.
its not something you can bring back the cheepest in to do

put together contact i will gladly forward some details etc
Is at hand a reliable and fair head...
Marine ply works ably. Thickness depends upon how flexible the floor you have immediately is. An ensure you seal any joint with a moral waterproof substance, taking great vigilance at edges where they sign up the wall.
Next use a marble and see where the floor runs too, as sea will always ensue in equal area. Lastly ensure that you index twice and cut once as waste is deeply costly.