We have very cold floors in the kitchen because the outside air is moving up through the external cantilevered floor.
I'd like to insulate it by cutting 2" foam (probably XPS or Polyurethane) and attaching it between the joists. Note: house is in San Francisco (lowest temp is about 38F) Three questions:
- Is this a good approach? (better ideas welcomed)
- Do I need to worry about moisture buildup?
- What's the best foam for the job?