10 Plumbing Mistakes DIYers Commonly Make

Tackling plumbing projects on your own can save money, but it also comes with risks. Many DIYers make mistakes that lead to bigger problems. Here are 10 common plumbing mistakes and tips on how to avoid them:

1. Using Teflon Tape Incorrectly
   Teflon tape prevents leaks in threaded joints, but it needs to be applied properly. Wrap it clockwise around the threads, 2–3 times, and use the correct tape for the job (white/pink for plumbing, yellow for gas).
2. Improper or Missing Ventilation
   Plumbing systems need proper vents to prevent sewage backups. Ensure your home’s plumbing is well-ventilated to avoid unpleasant odors and clogs.
3. Forcing a Seized Valve
   Old valves may seize from rust or calcification. Instead of forcing them open, gently loosen the nut or replace the valve to avoid breaking it.
4. Overtightening Connections
   Tightening fittings too much can strip threads or crack fittings. Tighten by hand, then use a wrench for just a half-turn to avoid damaging the connection.
5. Soldering with Water in the Line
   Never solder pipes with water still in them. Drain the water first, or use a compression fitting to avoid leaks from the soldering process.
6. Using the Wrong Tools
   Plumbing requires specialized tools. Invest in quality tools like pipe wrenches, drain augers, and pipe cutters to avoid damage.
7. Not Turning Off the Water
   Always turn off the water supply before starting plumbing repairs. Failing to do so can cause flooding and significant water damage.
8. Not Knowing Local Plumbing Codes and Regulations
   DIYers often ignore local codes, which can lead to violations and even insurance issues. Always check plumbing codes before beginning a project.
9. Missing or Improper Placement of Cleanouts
   Properly placed cleanouts make it easier to fix clogs. Install cleanouts at key points in the drainage system according to local codes.
10. Underestimating Project Difficulty
    Plumbing can be more complicated than it seems. If the job feels too difficult, or you lack the proper tools, consider hiring a professional.

Avoiding these mistakes will help ensure your plumbing projects are safe, effective, and up to code.