Why are my pipes making noise at night?

Pipes often make noise at night because temperature changes cause them to expand or contract. Other common causes include loose pipes, pressure fluctuations, or water hammer when valves shut off suddenly.

How do I stop my pipes from rattling?

Rattling pipes usually mean a pipe is loose. Adding insulation, tightening straps, or cushioning the pipe where it contacts framing typically stops the vibration.

What causes a loud banging noise in my plumbing?

A loud bang is typically water hammer—a pressure surge that happens when fast-moving water stops abruptly. Draining the system to restore air chambers or installing a hammer arrester usually solves the problem.

Is whistling in pipes serious?

Whistling often means a restricted pipe, worn washer, or faulty valve. While not always urgent, it can indicate developing issues and should be inspected if the noise persists.

Why are my pipes making noises at night?

February 13, 2012

If your pipes make noises at night—creaking, rattling, whistling, or loud banging—there’s usually a clear cause. Most of these plumbing sounds come from temperature changes, loose pipes, or pressure issues, and many can be fixed with simple adjustments. Here’s how to diagnose each noise and when to call a plumber.

TL;DR

Creaking or cracking pipes usually come from expansion and contraction as hot water heats the pipes.
Rattling happens when loose pipes vibrate against framing or fasteners.
Whistling often indicates a restricted pipe, faulty valve, or sediment buildup.
Loud banging is water hammer, caused by sudden pressure changes in the plumbing system.
If noises persist, schedule plumbing maintenance to prevent long-term damage.

Creaks or cracking sounds

These noises usually come from pipes expanding when hot water flows through them and contracting as they cool. If the pipe rubs against framing or a tight hole in the wood, you’ll hear creaking. You can fix this by adding insulation around the pipe or widening the opening so the pipe can move without friction.

Rattling

Rattling occurs when water pressure moves a loosely secured pipe, causing it to vibrate against framing or strapping. Adding cushioning or tightening the pipe’s fasteners typically resolves the issue.

Whistling

Whistling sounds usually mean water is flowing through a restricted area. The restriction might be sediment buildup, a worn washer, or a faulty valve. If the noise happens only at one faucet, replace the washer or repair the valve seat. If it occurs across the home, try to adjust the water pressure at the main valve. If that doesn’t fix it, the valve may need replacement by a Boston plumber.

Banging (water hammer)

The loud banging that occurs when water flow stops suddenly is known as water hammer. It happens when there’s no air cushion left in the system to soften the pressure wave inside the pipe.

You can restore the air cushion by shutting off your main water supply, opening all faucets to drain the system, then turning the water back on while closing faucets from lowest to highest. If that doesn’t help, install a water hammer arrester at the problem area.

When noisy pipes mean it’s time to call a plumber

If your plumbing is making recurring noises—especially banging, whistling, or rattling—it’s a sign you may need plumbing maintenance. Noises often signal loose pipes, pressure problems, or failing components that can lead to leaks or damage if ignored.

Categories: Plumbing