Actually finished this project (as least most of it) in the summer and started using it. As the drain had never been used after moving in we ended up calling Rotor Rooter to clean out the pipe as it was backing up into the basement. Anyway... now I get email from them and yesterday received one talking about avoiding frozen pipes.
I forgot about insulating the pipes that are exposed, which are behind the shower. The room where they are is not outside but is currently the equivalent to the attic, temperature-wise. The next project is to finish this space, but in the meantime, it is can be pretty cold in winter.
Especially now that the temp is 6 deg. It's only Maryland so not super cold.
Last night I just put a light out near the area where the pipes are exposed and checking the thermometer I stuck out there it is almost 40 deg.
I was planning on wrapping with foam insulation and then hanging some more fiberglass in front of it. Then covering that with some old drywall temporarily.
I was thinking about pipe tape but am not sure how safe that would be.
If we leave the house during the winter I will just shut off the water in the basement where it leads up to the bathroom.
I know the light is not the most economical method but maybe is safer than the pipe tape.
The pipe to the shower head does run to the right behind the chimney. I think I can shove some insulation in there.