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plumbing troubleshooting
Question by random421 (37)
Answer by TheRealPlumber (249)
Knocking in a plumbing system is cuased by thermal expansion. Some homes are built with a air space between floors and certain times of the year you will hear knock due to the piping expanding.
Answer by CarolynOsborne (2804)
A knocking sound in your pipes comes from air inside your pipes as well as pipes not being tied down (e. g. clamped to a wall).
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