Our house has the master bathroom cantilevered over the edge of the house. the underside of that cantilever is covered with soffit material. I've had trouble with the pipes freezing once before, so i went up under the cantilever to see how the pipes were insulated. I found this:
There was prob r-38 or greater insulation in bats laying on top of the soffit. other than that, the floor joists that run front to back of the house were uninsulated, therefore, cold air was running down the middle of the house (which explains why my bathroom floor is freezing), and the cpvc pipes were bare and uninsulated.
I have considered cutting plywood panels to fix in between the joists to block airflow, and caulking and insulating. I also want to use pipe insulation on any pipes that are exposed. Do you all think this enough, or should i, in essence, stuff that hole area with insulation?