On Feb 9, 8:55*pm, Zootal wrote:
The continuing saga of me and my broken plastic pipe and shower valve
lol...

So I am removing the sheetrock in pieces small enough that I can put them
back with minimal patchwork when I'm done - hopefully. As I open up the
wall behind the shower stall, I find that it is stuffed full of insulation. *
Is this normal, typical, or even expected? Is there any reason to put
insulation in an interior wall simply because there is a shower stall on
the other side?

When we remodeled my downstairs bath, we stuffed the interior walls,
mainly because we could. I can't say it has made any noticeable
difference though, the tiles are still very cold to the touch in the
winter months. Still it was worth a try. It probably does make it
easier for the ceiling mounted electric heater to warm it up for a
shower, but it is hard to say.