Basements, humidity and dehumidifiers

Basements, humidity and dehumidifiersThere seems to be a misconception of the relationship between basements, humidity and dehumidifiers; which probably results in the dehumidifier being one of the most misunderstood and least respected household appliances. This is apparent because many first time home buyers are turned off to any home where they see a dehumidifier, thinking there is a moisture problem. The dehumidifier doesn’t even have to be running; it could be turned off and tucked away in a closet.

The battle that all home owners deal with is keeping moisture out of the basement. Of course, regular maintenance can retard water penetration from the exterior: having the proper grading and extending downspouts will keep rainwater away from the home’s foundation. And serious water penetration issues should be resolved by licensed professionals. However, if the home doesn’t have a foundation or water penetration issue, basement humidity is still an ongoing battle. And if your home has an in-ground basement, chances are you know what I am talking about.

Believe it or not, it’s not necessarily a water problem that dictates humidity in a basement; but rather it’s physics. More precisely: thermodynamics and entropy. Put simply: temperatures in your home seek equilibrium, and warm air will move toward cooler air. Basements tend to be cooler than the upper floors because warm air rises. However, as the temperature seeks equilibrium, the warm air will also move toward the cooler basement air. When warm air meets cold air, the air condenses and develops humidity.

Basements, humidity and dehumidifiers

Although humidity is generally thought of as the amount of moisture in the air; according to Dehumidifier Basics(energystar.gov), it is most commonly referred to as “relative humidity” or RH. “RH is the amount of water vapor actually present in the air compared to the greatest amount of water vapor the air can hold at that temperature.” An RH between 30% and 50% is considered to be optimal. When RH is above 50%, bacteria and mold may grow.

If you don’t have a dehumidifier, you might consider buying one to help maintain the optimal RH in your basement. Dehumidifiers are differentiated by capacity, which is described as pints per 24 hours (measured by the size and conditions of the area where the unit may be placed). Energy Star provides a chart to help you decide the capacity best suited for your needs.

If you already have a dehumidifier, you might be surprised to know that most units are not meant to be operated in areas that are below 65°F (according to Energy Star); however, there are models that are designed for lower temperatures. If you use your dehumidifier in temperatures below 65°F, the unit may not function properly even though you may hear the compressor running. Below 65°F, frost can form over the condensing coils inhibiting the unit from removing moisture from the air. If your unit frosts, it should be unplugged and allowed to defrost.

Although some units are designed to be placed against walls, Energy Star recommends placing your dehumidifier in an area that allows free circulation of air around the unit for optimal operation. And of course, refer to manufacture’s manual for operation and electrical safety warnings.

Maintaining a comfortable RH level in the home can be achieved, and it starts by proper home maintenance. However, a dehumidifier may be necessary for optimal comfort. Energy Star (energystar.gov) provides consumer information about selecting and safely operating a dehumidifier.

Original published at https://dankrell.com/blog/2015/05/08/basements-humidity-and-dehumidifiers-whats-the-problem/

By Dan Krell


Disclaimer. This article is not intended to provide nor should it be relied upon for legal and financial advice. Readers should not rely solely on the information contained herein, as it does not purport to be comprehensive or render specific advice. Readers should consult with an attorney regarding local real estate laws and customs as they vary by state and jurisdiction. Using this article without permission is a violation of copyright laws.

Is Your Home Ready for the Rains?

by Dan Krell
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With spring’s arrival come blooming cherry blossoms and flowers, nesting birds, and the light yellow haze of pollen on your car. Additionally, springtime means there will be sustained rains and water saturated lawns. Is your home ready for the springtime showers? With regular maintenance and scheduled inspections, your home’s roof, gutters and downspouts, sump pump and windows will withstand the springtime showers (as well as year round rains and snow) and prevent your home from becoming a water hazard.

Obviously, a leaking roof can be problematic. However, with proper maintenance, you can prevent any major leaks; regular checks can determine the condition of the roof system including the shingles and flashing. Roof systems and materials vary from home to home and wear may vary. However, curling, lifting, broken and missing shingles as well as failing flashing should be repaired as soon as possible to prevent ice dams and water penetration through sheaving and membranes.

A common cause of outside water penetration into a basement is due to clogged gutters and downspouts. When gutters and downspouts become blocked, water is not efficiently carried away from the home. Instead the water pools around the home’s foundation. Debris on the roof can not only damage the roofing material, it will clog the gutters and downspouts and should be removed immediately. You should have the gutters cleaned and inspected at least twice a year to ensure proper function.

Water may also enter your home because of a failed sump pump. The purpose of the sump pump is to remove excess water from the home that has collected in the sump pit from excess drainage around the foundation. A sump pump has a typical life span of ten years, and because parts often need servicing it should be tested regularly. If your sump pump is connected to the home’s electric system, you might consider having a battery backup system to ensure the pump is operative when you need it the most.

Windows are often overlooked when there is a leaking problem. However, water can enter around windows and seep down the walls of your home. This can happen if windows are sealed or installed improperly. A visual inspection of the window exterior can determine if the caulking or sealant around the windows is cracked or missing and in need of repair.

If you find that water has infiltrated your home, call a professional immediately- waiting can make the damage more extensive. If it is safe to do so, you may want to remove your valuables from the water. You should refrain from using any electrical equipment in and around the water; don’t use your household vacuum to clear excess water, nor should you use electrical appliances while standing in the water.

Once the source of the water penetration has been repaired, your focus will be on water removal and cleanup. To ensure proper cleanup, you might consider one of the many professional cleanup and restoration services; proper cleanup can reduce incidences of mold and mildew that arise from water damage.

Regular inspection and maintenance can prevent water damage to your home. To prevent injury, it is recommended you hire a professional for inspections and repairs.

This article is not intended to provide nor should it be relied upon for legal and financial advice. This article was originally published in the Montgomery County Sentinel the week of April 28, 2008. Copyright © 2008 Dan Krell.