Seal flush-mounted shower tray on solid wood / dowel wood ceiling to measure

Hello,

can someone briefly explain to me how a level-access shower tray is sealed on a solid wood ceiling or dowel wood ceiling? The shower tray itself is sealed with sealing tapes and liquid foil to the wall. But how is the area under the shower tray sealed in case water penetrates downwards? In the case of concrete ceilings, the floor is coated with liquid foil and the drain is sealed with sealing tapes (am I understanding this correctly?). But what special considerations are there for a wooden ceiling? Many thanks

A drain was installed in the floor for us. Including a drain channel and siphon. It was as big as the shower and tiles were laid on it.

I don’t mean a tiled shower, but rather a shower tray that is very shallow and almost flush with the floor. And it stands on feet or similar, and you should also seal underneath the tray, just in case.

But how is the area under the shower tray sealed in case water penetrates downwards? For concrete ceilings, the floor is sealed with liquid foil

Nope, nothing was sealed there.
Our shower tray stands/is placed on a frame; if water ever finds its way to this frame at the edge of the shower tray, it is directed into the drain through another outlet. For example, google Kaldewei ESR II. Otherwise, normal installation = connection of siphon + pipe to the wastewater pipe.