![]() 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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