It is firm and pretty level.
How to install a shower tray on a wooden floor youtube.
Before you start you need to make sure that the floor beneath the tray is capable of supporting it.
Of the two designs these are generally a bit more complicated to install because they fit directly onto the floor with no gap in between.
This guide explains how to install a shower pan over existing plumbing.
How to install a low profile shower tray.
The ratio for the mortar mix was 5 sand to 1 cement.
How to install shower tray.
I was not planning on tiling the floor so i will probably go with the cement or silicone method directly onto the existing flooring.
I just wanted to check with someone that it was ok to cement the base directly onto a tongue and groove timber floor.
If the floor is not level the shower pan will not be able to drain properly.
Fix an uneven floor using a self leveler.
If the subfloor is wood waterproof it before using self leveler and before spreading mortar or adhesive.
Good point about the ply raising the level of the floor.