Your installation of wet room kit in timber floor shows channel direction parallel to floor joist direction;in my case floor joists run at right angles to channel;does this mean I have to notch at least 1,possibly 2 joists to accomodate bottom of channel or is channel base flush with underside of tray?
Thank you for your question.
Nothing the joists is not recommended. It is much better option to try to find a drain with different outlet position or maybe just the linear drain itself and create your own sloped floor.
Waste trap they are equippped with is completely rotatable and it's pipe is adjustable.
I am happy to help if you have any questions.