5 Common DIY Plumbing Mistakes (and What to Do Instead)

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Homeowners in Billings and Laurel often take pride in maintaining their properties themselves. While do-it-yourself projects can save money and offer a sense of accomplishment, plumbing is one area where well-meaning efforts can sometimes go very wrong. At Brown Plumbing, we’ve seen firsthand how simple DIY mistakes can lead to costly repairs—or worse, hidden damage that compromises the safety and efficiency of your entire system.

If you’re tackling plumbing projects at home, here are five common mistakes to avoid—and the professional alternatives that will help you get the job done right.

1. Over-Tightening Connections

One of the most frequent errors we see is over-tightening pipe fittings, supply lines, or toilet bolts. Homeowners often believe that tighter equals better, but excessive force can crack plastic fittings, strip threads, or warp delicate parts. This can lead to slow leaks or sudden bursts that do serious water damage.

What to Do Instead: Always follow manufacturer's torque recommendations. If you’re unsure, it’s better to go snug—but not tight—and test for leaks after the system is under pressure. When in doubt, call a plumber for assistance.

2. Using the Wrong Materials

Not all pipe materials play well together. For example, connecting copper to galvanized steel without the right dielectric fitting can cause corrosion and failure over time. Mismatched sizes, incompatible sealants, or using indoor materials for outdoor applications are other common issues.

What to Do Instead: Know your pipe types and codes before you start. Plumbing systems must meet local building codes in both Billings and Laurel, and using the wrong materials can lead to failed inspections—or worse, health hazards.

3. Relying on Chemical Drain Cleaners

It’s tempting to pour a liquid drain cleaner into a slow sink and hope for the best, but those harsh chemicals can damage pipes, especially in older homes. They’re also a short-term fix that doesn’t remove the underlying cause of clogs—like buildup or foreign objects.

What to Do Instead: Use a drain snake or plunger for mechanical clearing, or call a professional for camera inspection and safe removal. Better yet, ask us about regular drain maintenance plans to avoid clogs altogether.

4. Skipping Permits and Inspections

Some plumbing projects—like moving supply lines, installing water heaters, or adding fixtures—require permits and inspections under Montana state law. Skipping these steps can lead to fines, failed home sales, and even insurance complications if a problem occurs.

What to Do Instead: Always check with your local city or county building department before starting a major plumbing job. Or let us handle the paperwork and ensure your system is up to code from the start.

5. Ignoring Water Shutoff Protocols

Nothing sends a DIYer into panic mode like water gushing from a disconnected pipe. Failing to locate and shut off the correct water supply before working on a fixture or pipe is a recipe for a flooded home and damaged flooring or drywall.

What to Do Instead: Learn where your home’s main shutoff valve is, and test it occasionally to ensure it works. Before beginning any plumbing project, isolate the correct line and have towels and a bucket nearby—just in case.

Plumbing Peace of Mind, the Professional Way

At Brown Plumbing, we understand the DIY spirit—and we’re always happy to offer guidance. But for jobs that involve pressurized lines, gas connections, or code compliance, professional help is the safest and most cost-effective option. Serving Billings and Laurel, our licensed team ensures the work is done right the first time—so you don’t have to do it twice.

Visit https://brownplbg.com to schedule a consultation or emergency service. Whether you’re troubleshooting a leak or planning a bathroom remodel, we’ve got your back—no guesswork required.