I have a leak that's going from my upstairs bathroom tub/shower to my downstairs bathroom ceiling. The leak occurs only when someone is using the shower or tub. I had someone open up the ceiling and inspect was going on from below. A PVC pipe was found to be leaking and was repaired. I proceeded to re-grout all the tile where water may be wanted to go through the tile. I also re-caulked, using silicone, the corners of the wall where the tile and the tub meet.
That pipe no longer leaks, but amazingly, I appear to still have some leak somewhere else in the ceiling.
My shower head is detachable like a wand. I detached it and began applying water in various areas to see if I could reproduce the leak. I think I found that when I apply it on my escutcheon plate, it appears to reproduce the leak. I have a small hole there that I discovered in the grout, perhaps 2 mm thick. I am thinking to apply silicone to seal the plate. It is currently flush against the wall, and with the exception of the 2mm thick hole, I see no gaps. There is no silicone however, I suppose this was never sealed.
When researching how to silicone seal this, I found that some people recommend opening it up and putting plumbers putty, something I'm not sure is necessary in my case. I am planning to apply the silicone.
When applying silicone to the escutcheon plate, some people recommend putting it only on the top area where the plate meets the tile wall, where water would flow down into on top of the plate from the top of the shower. I suppose the rationale is that if water gets stuck there, it may somehow escape into the shower down the tile, rather than behind the wall. I'm not sure though.
Should I seal only the top 3/4 circumference of the plate, or should I seal the whole circumference of the plate?