The 10 Most Common Plumbing Mistakes DIYers Make

Overtightening Connections

Overtightening supply tubes, pipe and fittings and toilet bolts is the #1 DIYer mistake. If you crank too hard on a galvanized or black pipe, coupling, tee or elbow, you risk cracking the fitting. The crack may not happen right away, but the excessive force can break the fitting weeks later, causing a flood.

Overtightening the plastic fittings on toilet and faucet supply tubes is even more common. It just doesn’t take that much torque to seal a supply tube. If you tighten the hex nuts too much, they’ll eventually break and leak. Plus, overtightening toilet closet bolts at the floor or between the bowl and tank can crack the porcelain and destroy the toilet.

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