I'm in process of re-grouting my bathroom and have pulled off the old trim from the shower head and the pressure-balanced valve. I'd like to fill in the gap between the valve and the tile and the shower head pipe and the tile before I re-install them but I don't know what with.
IOW it's almost the same situation as on Ask This Old House last weekend but in that case they just filled the edge of the trim plate with plumber's putty and didn't fill the gap. I don't like the plumber's putty idea because it doesn't last; I prefer the weatherstripping as done by the original mfg and intend to replace mine with some generic self-adhesive stuff. But it still doesn't answer the question of what to do around the valve body.
I thought maybe foam--I have a can of Hilti's product--but I don't know if this will stand up--i.e., is it impermeable to water?--and how to stop it adhering to the valve body. Maybe Vaseline on the valve body? Will foam adhere to this? Or maybe cover the valve body with a plastic bag prior to injecting the foam? Anyone anything better to suggest?
TIA
-- Patrick Riley