![]() Thanks to Roger Hankey & Cheryll Brown, ASHI home inspectors in Minnesota, for the deteriorated transite pipe gas flue vent photograph and comments.(privacy protected) for the reminder to make a detailed inspection of the plumbing vent system when sewer gas odors are present. Thanks to Slade Franklinfor the reminder that a leaky wax ring at a toilet can lead to septic odors in bathrooms.Kia Gregory, 'New York Tries to Clear Its Sewers of FOG (Fat, Oil, and Grease)', The New York Times, p.'Guidance Document for Sizing and Installation of Grease Traps and Interceptors', Carrolton Texas, January 2012, retrieved, original source:.Improper plumbing vents or absence or clogging of a vent system can cause plumbing trap siphonage: water flowing down the building drain line can siphon or 'pull' the water seal out of plumbing traps. Buildings in which the plumbing vent system is incomplete, missing, or improperly constructed.Buildings in which plumbing traps are leaky, thus losing their water seal even over just a short time.Buildings left unoccupied for months,permitting the water in other traps to dry out.Watch out: backdrafting in buildings is more than a bad smell problem as it may cause unsafe back-drafting of combustion products and carbon monoxide into the occupied space - potentially fatal hazards. ![]() ![]() Backdrafting caused by exhaust fans used in tight buildings can sometimes both draw sewer gases out of a dry plumbing trap or other drain piping leaks and may move such odors through the building.Basement floor drains often become sources of sewer odors because they remain unused and dry out.Un-used basement plumbing fixtures like laundry sinks or basement bathrooms.Some places where we often find dry plumbing traps include:
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