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Tapping on Riser

I am in the bottom flr apartment of a 12 flr building. I hear tapping on the riser after after the boiler finishes its cycle. any ideas? Thanks

Comments

  • Jamie Hall
    Jamie Hall Member Posts: 24,511
    I'd bet on...

    contraction noise as the riser cools and shrinks and stick/slips on something.  Hard to find.  Harder to cure...
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
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