If a span of pipe is particularly vulnerable to low temperatures electric pipe heating tape acts like an electric blanket for pipes to prevent freezing.
Unfreeze pipes in attic.
Don t thaw pipes using a propane torch which presents a fire risk.
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.
Set a fan up to blow room temperature air at the cold 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.
If you need to unfreeze water pipes leave your faucets open slightly to help thaw out the pipes.
Thaw frozen pipe in a wall.
Surprisingly both hot and cold pipes can be at risk.
Use a space heater heat lamp or hair dryer to thaw the frozen length of pipe.
What to do if a pipe bursts.
Just because it s 32 degrees outside doesn t mean the pipes will reach those temperatures.
Controlled by a thermostat to activate only when the attic temperature plunges dangerously low the tape typically consumes about 5 watts per foot.
Use heat tape on problem pipes.
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.
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.