A Thumping Noise From a Water Pipe Upstairs When the Washer Is Running

Watch your pipes while the washing machine runs to see if any are loose. Pipe movement indicates looseness. If pipes rattle against studs or joists, this may be the cause of the noise.

Replace the pipe clamps on loose pipes. First, remove the old clamp by unscrewing it. Next, fit the replacement clamp over the pipe. Finally, screw the new clamp into place until it's tight. Wrap pipes that clang against studs with insulation, taping the insulation around the pipe.

Observe the pipes again while you run the washer. In some cases, this can solve your thumping problem. If you still hear thumping, there's another fix.

Turn off the water supply and open the valve on the washing machine pipes to drain any water in the pipes.

Cut out a 2- to 3-inch section of your pipe using your reciprocating saw. Cut close to the valve so your water arrester can have maximum impact.

Insert a T-fit pipe into the gap. Fuse the T-fit pipe to the existing pipe using a propane torch. The copper will melt and seal together.

Place a short pipe into the vertical arm of your T-fit pipe, which will hold the water arrester.

Push the right threaded fitting for your water arrester into the short pipe. It will nest inside.

Wrap the threads of your water arrester with Teflon or thread seal tape to ensure a tight fit. Thread the arrester onto the threaded fitting by turning it. When you've manually tightened it as much as possible, use a wrench to complete the tightening.

Turn the water back on. If pipes leak, tighten their connections for a better fit.