Fixing a pipe inside a wall is no easy task, so it’s a lot better to let a professional plumber deal with this. But if you feel confident you can do it yourself, just follow these instructions.
Cut out sections of the damaged drywall with a saw. Once you are completely sure where the damage is located, cut the wall in order to have access.
Wrap a sheet around the pipe and move around until it gets wet. If you don’t have the luck to see the breakage with your own eyes, you’ll need to find it with a sheet of cloth. You may have to repeat this a few times until you pinpoint the exact place of the breakage.
Place a container under the broken pipe. The plumbing repair will be messy, so the container should catch anything that spills from the pipe you’re about to work on.
Cut the pipe below the leak. You need to use a pipe cutter tool for this. Screw the tool tightly and rotate until the pipe is cut through.
Dry the pipe. You can’t work if it’s wet.
Cut above the leak with a pipe cutter again.
Clean the pipe. This includes both the inside and outside. The inside might hold more ice, so make sure it’s clear from any obstructions.
Mount a copper repair sleeve. Use a blowtorch to heat the bottom end of the repair sleeve. Allow the solder to melt and fill the joint. After it cools in about 10 minutes, do the same for the upper end. Wear safety goggles and gloves when doing this. Check for leaks after you’re done.
Patch the wall.