Tool Tips: Floor drains, PEX and Sheetrock, foaming leak detector
Here at McHenry County College, like any school, we have multiple floor drains in the bathrooms, kitchen and mechanical rooms. Some of these drains are seldom, if ever, used and are in obscure areas, resulting in work orders for a sewer gas odor. The repeat offenders are the drains that accept the discharge from the elevator sump pumps.
My solution: I pour RV antifreeze in these drains as it evaporates at a much slower rate and will not leave a funky smell as vegetable oil does. It is also cheap and nontoxic. When it comes to sewer gas, no news is good news!