I have a mud room (old closed in porch) I would like to turn into an extra bathroom. The room is outside of the foundation and is supported by block. I do have access under this room. Can I insulate this "free standing room" well enough to plumb and prevent freezing in the winter?

Im sure you can find something that will fit your needs for insulation. If the floor is high you will want to insulate it to keep from drawing heat out of the room. And as for pipes Aerocell is an excellent product in many sizes.

Ref:

Aeroflex USA, Inc. | Main | Insulation Tubes | Flexible Closed Cell | EPDM | EPDM closed cell foam | EPDM Foam | Rubber Insulation Products | Thermal Insulation Tubes, Thermal Insulation Sheets, Thermal Insulation Rolls, Rubber Insulation Products | (http://www.aeroflexusa.com/)

Calfdadof3 ,
I received email saying you responded, but I see no response.

calfdadof3 ,
I received email saying you responded, but I see no response.

You don't see a post #2? And your last post is post #3 ?