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When P-Traps Are Most Likely to Dry Out
For most short trips, homeowners do not need to panic about dry P-traps.
A weekend getaway or a brief business trip is usually not long enough for the water inside the traps to fully evaporate.
In many cases, P-traps can stay sealed for at least a couple of weeks, and sometimes longer, depending on the conditions in the home.
However, certain situations can cause water to evaporate more quickly. Heat, dry air, strong ventilation, and steady airflow can all speed up the process.
Some drains are also more vulnerable than others. Basement floor drains, laundry room standpipes, and drains in spare bathrooms may dry out faster because they are used less often.
The issue is most likely to appear during longer absences, especially trips lasting three weeks or more.
It can also happen in areas of the home where water rarely runs through the drain, even if the homeowner is not traveling.
The Better Way to Prepare Drains Before Traveling
Instead of relying on a loose glass and damp paper, the better approach is to prepare the drain system directly.
The first step is to make sure every P-trap in the home is filled with water before leaving.
Run water through each sink, shower, and bathtub for about 10 to 20 seconds. This helps refill the trap and restore the water seal.
It is also important not to forget less obvious drains. Laundry drains and floor drains should be included if the home has them.
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