How to Thaw and Repair Frozen Pipes

Despite what many think, expanding ice inside a pipe is not what causes a pipe to burst. It's the high water pressure that builds up between the blockage and the faucet as the ice continues to form, so the pipe doesn't always burst where it is frozen. If you discover a frozen pipe, leave the sink valve open a bit to offer relief from the excessive pressure.



In case you don't get a chance to insulate before the first freeze of winter, here are some other measures you can take to repair and/or thaw pipes.

Step 1: Survey Damage

Find out how much damage has occurred. Open the faucet at the end of the pipe and close the valve that runs into it. Check for holes, cracks or breaks along the pipe. Even if the pipe has been compromised, don't panic.

Step 2: Repair the Pipe

Some pipe repairs are easy. For example, a pinhole can be repaired by simply wrapping the pipe with electrical tape or duct tape and a hairline crack can be fixed with a pipe clamp.

For larger cracks, try repairing them with a patch kit. Start by sanding the area around the break in the pipe with rough-grit sandpaper (at least an 80- or 100-grit). Put on rubber gloves and wet the patch, then wrap it around the pipe where it has burst. Start wrapping at the hole and work out from there; wrap at least 4 or 5 inches in both directions. Wrap it as tightly as possible and then press the patch down by hand to ensure a proper bond. Let the patch dry.

For larger cracks that can't be repaired with a patch kit, you may need to replace that section of pipe. Consider calling in a plumber to complete this task.

Step 3: Thaw Pipes

There are several different methods for thawing pipes. You can try using a hairdryer on a low setting, placing a heat lamp or small electric heater near the pipe, or wrapping it in heat tape or an electric blanket. You can also try wrapping towels around the pipe and pouring hot water over them but, no matter which method you use, it should never include a torch.

When thawing a pipe that has burst, look for the shut-off valve to that section of pipe. If necessary, shut off the main water supply to prevent flooding as it thaws.

Safety Alert!

When using a hairdryer, heat gun, or electric heater, please be aware of wet floors and the potential danger of electric shock.

Check the area. If you find potentially dangerous electrocution hazards or extensive damage to pipes, it is best to call a plumber.

Step 4: Insulate Pipes

Once you're sure your patch works, insulate your pipes to prevent a frozen pipe problem next winter.

For pipe insulation and other water pipe repair supplies, visit Martens True Value Hardware in Reedsburg, today!