Business Magazine

Stinky Basements, Stinky Plumbing Fixtures, and Sewer Gas

By Homesmsp @HomesMSP

Have you noticed any foul odors in your basement that you just can't get to the bottom of?  It might be sewer gases coming in to your home.  Every plumbing fixture needs to be equipped with a trap, which is basically a dip in a pipe that water fills up.  This water sitting in the trap is what prevents sewer gases from coming in to your home.  The photo below shows a "P-trap" - this is the type of trap you'll find below sinks, showers, and bath tubs.

P-trap explained

Toilets have their own built in traps, and so do floor drains.  The trap on a floor drain is located below the surface of the floor - the photo below shows a floor drain as seen from the side.

Floor Drain

The problem that home inspectors often find in basements is that floor drains or other plumbing fixtures in the basement never have any water flowing to them, so the water in the trap eventually dries out and allows stinky, hazardous sewer gas to come in to the home.  Because of this, abandoned or shut off plumbing fixtures are always listed as a hazard or required repair on Truth-In-Sale of Housing evaluation reports in Minneapolis, Saint Paul, and the rest of the surrounding cities.

P-trap with no water

Floor drains are the most frequent offenders.  If a floor drain doesn't have water flowing to it on a regular basis, the water in the trap will dry out.  A few common things that regularly drain to floor drains and help prevent the traps from drying out are AC condensate drain lines, high efficiency furnace condensate drain lines, humidifier drain lines, dehumidifier drain lines, HRV drain lines, and water softener discharge lines.  If you don't have anything draining to your floor drain on a regular basic, the water in the trap may evaporate.

rv antifreeze

One fix is to pour some RV antifreeze in to the drain.  RV antifreeze is cheap, sold everywhere, safe for the environment, and it won't evaporate.  It's made just for this kind of thing.  Another option is to periodically pour some water down the drain; you'll obviously need to do this on a regular basis, but it's free and easy to do.

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