I'm planning a remodel and addition project and opening up all walls, replacing plumbing lines. Contractor says no insulation is required for building plumbing lines. Only wall insulation. I know many modern buildings (even in third world countries) insulate the plumbing lines to dampen the noise as the water runs through pipes so it's quiet, as well as for heat insulation of hot water lines. What do you think? Isn't common to insulate plumbing lines throughout the home?
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