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How to Stop a Plumbing Leak

Small water leaks at soldered copper joints can be easy—or not so easy—to fix. This article explains the options, including what to do if all else fails.

By the DIY experts of The Family Handyman Magazine

How to Stop a Plumbing Leak

Small water leaks at soldered copper joints can be easy—or not so easy—to fix. This article explains the options, including what to do if all else fails.

Drain the water, then solder

Shut off the water at the main valve in your home and open up nearby faucets to completely drain the pipe with the leaky elbow. Dry the outside of the elbow and sand (120-grit paper or cloth) around the leaking joint to remove all surface corrosion. Apply soldering flux around the whole joint and apply heat with a torch until the old solder melts. Add new solder until a shiny ring of solder shows all around the joint. Let the pipe cool for five minutes, then turn the water back on and cross your fingers that you stopped the leak.

If the leak continues . . .
Turn off the water again, open faucets to drain the line and cut out the entire elbow. Then solder in new fittings.

A last ditch effort . . .
Sometimes you can't solder in the new fittings because there's a continuous slow trickle of water. If you don't want to wait for the water to completely drain, try this trick. Replace the elbow with a tee with a threaded fitting soldered on one end. This open end allows any moisture to escape as steam so you can heat the joint enough to melt the solder. When the pipe has cooled, screw in a threaded plug. Be sure to use Teflon tape or pipe compound on the threads.

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Required Tools for this Project

Have the necessary tools for this DIY project lined up before you start—you’ll save time and frustration.

    • Plumbers tape
    • Rags
    • Slip joint pliers
    • Soldering torch
    • Tube cutter

Required Materials for this Project

Avoid last-minute shopping trips by having all your materials ready ahead of time. Here's a list.

    • Cloth sandpaper
    • Lead-free solder
    • Flux
    • Copper pipe
    • Copper fittings

Comments from DIY Community Members

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April 17, 8:49 AM [GMT -5]

I found out when soldering a copper pipe and the water is dripping, I put a small piece of bread ( no crust) into the pipe and that stops the drip. Solder the pipe and turn the water on and the bread is mushie and will go through the pipe with no problem.

Norm

October 25, 3:35 PM [GMT -5]

You can also use solderless push fittings in places that are hard to get or if you do not feel comfortable soldering in tight places.

June 14, 9:36 PM [GMT -5]

When sweating pipe fittings it is, of course, important to keep the joint dry. Stuff a piece of bread in the end of the pipe to keep the joint dry. After the joint is complete and the water is turned on the bread will turn to mush and flush right out ! Dad taught me that one years ago. JTW

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