Field tests of residential water systems showed that for uninsulated pipes installed in an unheated attic freezing began when the outside temperature fell to 20 f or below.
Unfreeze pipes in attic.
Otherwise you can thaw out the pipe by wrapping the pipe in a single layer of thermal tape or blowing air from a hair dryer back and forth across the pipe.
Don t thaw pipes using a propane torch which presents a fire risk.
Just because it s 32 degrees outside doesn t mean the pipes will reach those temperatures.
What to do if a pipe bursts.
If you need to unfreeze water pipes leave your faucets open slightly to help thaw out the pipes.
Use heat tape on problem pipes.
Wrapping freezing pipes with thermostatically controlled heat tape from 50 to 200 depending on length is also an effective way to quickly thaw a trouble spot.
Open any cabinet doors or panels to expose the pipe to the warmer room air.
Water freezes at 32 degrees fahrenheit but indoor pipes are somewhat protected from outdoor temperature extremes even in unheated areas of the house like in the attic or garage.
Controlled by a thermostat to activate only when the attic temperature plunges dangerously low the tape typically consumes about 5 watts per foot.
If you find a leak close the main shut off valve to your house and call a plumber immediately.
Use a space heater heat lamp or hair dryer to thaw the frozen length of pipe.
Thaw frozen pipe in a wall.
For fixing frozen pipes in an exterior wall without opening the wall take the following steps block wind from the outside of the wall as best you can.