Subzero temperatures can cause even interior pipes to freeze.
When water freezes it expands in volume by about 9 percent. The pressure inside pipes may go from 40 psi to 40,000 psi… so the pipe breaks open at a weak point. Burst pipes are one of the most common causes of property damage during frigid weather, costing thousands in water damage. Before cold weather sets in:
Know how to shut off your water. Locate your main water shut-off valve.
Make sure your sprinkler system is turned off and fully drained.
Identify pipes that might be prone to freezing… (crawl spaces, unheated rooms, basements, garages, exterior walls).
Close off crawl spaces, repair drafty windows, insulate walls and attics, eliminate drafts around doors.
Where pipes are exposed, wrap them with insulation or heat tape.
Keep the heat in your home at a minimum of 55o Fahrenheit.
Allow drips from faucets overnight to relieve pressure.
Disconnect all outside hoses.
When Pipes Do Freeze
Shut off your water at the main shut-off valve.
Call Your Plumber.
Keep faucets open to relieve pressure.
Turn up the heat.
Open cabinet doors so warm air can reach pipes under sinks.
You can melt frozen water in pipes by warming the air around it with a hairdryer or space heater. Do not leave space heaters unattended and avoid the use of kerosene heaters. DO NOT USE AN OPEN FLAME.
Once pipes are thawed, slowly turn the water back on and check pipes and joints for any cracks or leaks caused by freezing.