Consider installing specific products made to insulate water pipes like a “pipe sleeve” or installing UL-listed “heat tape,” “heat cable,” or similar materials – even a quarter inch ...
OR WRAP YOUR PIPES WITH INSULATION TAPE. EXPERTS SAY IF YOU HAVE A WATER HEATER, YOU WANT TO TURN THAT SETTING TO PILOT OR VACATION MODE, AND THAT WILL JUST HELP YOU PRESERVE THE WATER PRESSURE.