Squeaks, bangs, rumbles, and other structural and mechanical noises in buildings can be reduced or prevented by careful detailing.

1. A wood subfloor that is glued to the supporting joists as well as nailed is much less likely to loosen and squeak over time than a subfloor that is merely nailed. Screws or ring-shank nails are much less likely to loosen and squeak in a subfloor than common nails.

2. A prefabricated wood stair with housed stringers uses wedges and glue to create a tight unit that is highly resistant to loosening and creaking underfoot.

3. Doorstops, frame pads, and door closers reduce dramatically the amount of noise that a door can generate as it opens and closes.

4. Motors, pumps, fans, and other machinery should be isolated acousti-cally from the structure of the building to reduce the transmission of structure-borne noise. Many types of resilient equipment mounts that use metal springs or rubber pads are available. Flexible duct connectors should be used to join ductwork to fans.

5. Hot water pipes and hydronic heating pipes expand and contract longitudinally when they heat and cool. This causes them to rub against their mounting brackets. A smooth plastic mounting bracket reduces friction against the pipe and virtually eliminates the ticking and scraping noises that a metal bracket would generate. ■

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