Post Plumbing Job Checklist

Holding a piece of cloth around condensation on a pipe
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How to spot tiny leaks and flush debris out of pipes

When the job is done and you're ready to pack up your tools, take the time to do a final check for tiny leaks and sediment lingering in the lines. There's no 100 percent prevention for either problem, but if you take a few precautions, you can reach 99 percent certainty. And that's about as good as life gets.

Condensation on a copper pipe
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Don't Get Fooled by Condensation

In high humidity, a cold water line will sweat, making it almost impossible to detect tiny leaks. Here's how to work around that: Run the water just enough to fill the line. Then take a coffee break while the water in the pipe warms to room temperature. When it's warm enough, wipe the pipe dry and look for leaks. Condensation may also be caused by cold water in drain lines.

Stress Testing Drain Lines
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Stress-Test Drain Lines

To test drain lines under a sink, don't just turn on the faucet. Instead, completely fill the sink. (Fill both bowls on a double sink.) Then open the drain to release a gush of water. In humid conditions, fill the sink with lukewarm water. Cold water will cause condensation on the lines and prevent you from finding leaks.

Flush before you caulk
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Flush Before You Caulk

A small leak at the toilet flange leads to a puddle. But if that puddle is dammed up by caulk around the toilet base, it may not show up for months. So before you caulk, flush a couple times and probe for leaks with a strip of paper.

Detect drips with paper
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Detect Drips with Paper

Paper towels or newspaper are great leak locators. You'll immediately see—or even hear—leaks as soon as a drip hits the paper.

Locate leaks with tissue
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Locate Leaks with Tissue

A wet spot on a tissue is a lot easier to see than a small droplet on a pipe. So wipe with a tissue and look at it after each swipe.

Check the Sink Rims
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Check Sink Rims

Dribble water around a sink rim to check the seal. Rim leaks rarely show up right away, so wait a few minutes before inspecting from below.

Flush before you connect
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Flush Before You Connect

Sediment trapped in a fill valve can make a toilet fill slowly or run constantly. To flush out this sediment, run water into a bucket before you connect the supply line.

Start at a high volume
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Start at a High-Volume, Low-Risk Valve

To flush out debris, you need a high-volume flow of water. That makes outdoor hose bibs and washing machine supply lines great for this purpose. These faucets have another advantage too: Unlike kitchen or bath fixtures, they have big, simple ports that are less likely to get plugged or damaged by sediment. Just keep in mind that any faucet you choose for flushing should be downstream from the work area.

Watch out! Washing machine hoses often have screens that can become plugged. Luckily, they're easy to remove and clean.

Protect the shower head
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Protect the Showerhead

Low-flow showerheads have tiny openings that can be plugged by a single particle. So run the tub faucet before the shower. In a dedicated shower (no tub spout), remove the showerhead and flush the line.

Remove aerators
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Remove Aerators

Small particles that flow through a faucet often get caught in the aerator. So always unscrew the aerator and run the water after a plumbing job.