Plumbing Noises .org

Do strange noises come from the pipes in your house?  Do you hear hissing and banging during the day, and wonder what it is?  What should you look for and how can you fix it?

Plumbing Noises: How to Solve Noisy Water Pipes

A: A reduction of 1.5:1 (typically 3/4" to 1/2" is commonly used to increase or maintain water pressure throughout a house. The theory is that, given constant supply pressure, restricting volume will increase velocity. Released pressure at a fixture will be compensated for by this increased velocity.

I expect your hot and cold supply pipes are 1/2 inch diameter. What diameter is the plastic feed? If the reduction is greater than 1.5:1 it's quite likely that the velocity is great enough to cause noise in the pipe.

Check that all the plumbing shut-off valves (below the sinks etc.) are completely open. They too, can cause turbulence/noise by restricting water flow. Also, check all the pipes to see if there are any crushed or dented sections.

Foam wrap is a great for insulating plumbing, but perhaps a little too soft for noise damping (it would crush flat). By all means, wrap the pipes, but use denser rubber for vibration pads. Extra bracing (for clamping to) might also help.

Alternative: Before you start pulling out nails, check the water velocity at your fixtures, and if it is extremely high, a pressure reducing valve can be installed on the supply line of your plumbing.

Learn more about plumbing and home inspections

Gil Strachan is a professional home inspector, representing Electrospec Home Inspection Services in east-central Ontario, Canada since 1994. Visit http://www.allaroundthehouse.com to learn more about home inspections.

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