The PEX supply lines in the attic are not insulated.PEX lines are resistant to freeze damage but the water in them can still freeze.In a cold spell like we had in January '10 the water lines can freeze solid.I recommend they be insulated.
From the IRC.
- P2603.6 Freezing.
In localities having a winter design temperature of 32°F (0°C) or lower as shown in Table R301.2(1) of this code, a water, soil or waste pipe shall not be installed outside of a building, in exterior walls, in attics or crawl spaces, or in any other place subjected to freezing temperature unless adequate provision is made to protect it from freezing by insulation or heat or both. Water service pipe shall be installed not less than 12 inches (305 mm) deep and not less than 6 inches (152 mm) below the frost line.
Do you know if there have been recalls on your home's appliances? For your health and safety complete a ReCall Check. Included FREE with an Alpha Home Inspection.