Boarding between joists

[Lakey]

Happy New Year everyone!

Just wanted to check the feasibility on a shower room floor prep.
A customer has asked me to tile (walls & floor) in an ensuite shower room.
She is quite uneasy on her feet so wants the transition between the bedroom carpet & the ensuite tiled floor to be as level as poss.
The room is literally a shell at the mo.
Would it be standard practice to board between the joists with 18mm marine ply to enable a level threshold.
I would then intend to lay 10mm Jackoboard, UFH cable, SLC & an 8-10mm porcelain floor tile.

Any input gratefully received.

 

[Ajax123]

yes but don't forget you will need to create a fall. standard wet room trays have a 10mm fall running from 20mm deep to 10mm deep at the centre. This means that away from the drain you will need 20mm not 10mm board. unless you are not using a tray and have some other ingenious way of creating the fall to drain.

 

[Lakey]

Thanks @Ajax123
It's a shower room not a wet room so will be installing a shower tray

 

[Ajax123]

Thanks @Ajax123
It's a shower room not a wet room so will be installing a shower tray

In that case disregard my query reference the drain...