I have hot and cold water (1/2" copper) lines going from my basement over the wall between the joists and then then rising above through the floor of the kitchen overhang. I have 1/2" plywood covering the bottom of the overhang. To prevent the pipes from freezing, I am placing 3-1/2" R-13 insulation on top of the 1/2 " plywood and below the pipes. I am also placing the same insulation between the pipes and the outside wall as well as on either side of the pipes between the joists. I am leaving the pipes exposed to the inside of the basement and the bottom of the kitchen overhang (floor) so that the warmth of the basement/kitchen floor keeps the pipes from freezing. I have also put foam insulation on the pipes. Would this work? Would the foam insulation be a hindrance?
I originally had polybutylene pipes and did not have any problem for the past 20 years. I got rid of these and used copper instead with shark bite fittings when I did some remodeling.
Thanks in advance for any feedback.