RE: KEN-SHOWER23 Oct 2019 18:25
NK, i inspect plumbers work for a living.. First a question. is the tray raised off the floor or flat on the boards or a wet room type.
If ts raised like most are, remove the trim panel and get access to the waste trap below, this is normally the best place to start and in my experience the main leak area. Dry that off with kitchen towel and place newspaper underneath it if no leak is obvious (newspaper keeps a stain mark if a leak is minor). if an obvious leak, remove the trap and either clean it or what i would do is replace it for the cheap cost. looking inside the cubicle at the drain there is normally a screw visible that nolds the chrome waste above the tray, try tightening that with a posi screwdriver (dont be brutal) sometimes leaks there.
As for silicone , there shouldnt be any silicone on the tray where the cubicle sits on it. If there is get a new plumber, the cubicle should sit inside the lip of the tray and water run into the tray from the inside. If you seal it with silicone (loads of people think you should) it will just trap moisture and promote mold. Silicone down the vertical sides is fine and normal. You can check for leaks from the cubicle easily enough by spraying water at those places using the shower hose (but start at the bottom where the tray is not at the top of the side joins).
Going in from the ceiling below (unless a wet room floor mounted tray) is bonkers and destructive , if the ceiling hasnt already come down dont make the damage worse by doing that, theres no need.
Also check the washers in both ends of the hose are there and sealing at those points, worst problem would be if the grout in the cubicle is crumbly or suspect, water can run down the wall behind the tiles then.
Good luck with it all, if i can assist anyway do let me know, am happy to help, just difficult without being there or seeing photos.