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Preventing Mold And Mildew Growth In New Homes


									Are you building a new home? If so, you've got many important things to think
about ... from the design of your new home to mortgage decisions and insurance
arrangements. Another important item that should be on your list is health concerns
from moisture, mold and mildew growth.

Tighter construction methodsand the materials used to build new homescan easily
contribute to indoor air quality issues and serious moisture problems if builders and
homeowners overlook the underlying factors that cause them.

As an example, polyethylene has long been used as a vapor barrier to keep moisture
out of homes because it's inexpensive and completely impervious to water.
Unfortunately, a house wrapped in polyethylene can also prevent moisture that's
already inside the home from escaping. This results in higher humidity levels, which
in turn can result in the rapid growth of mildew and mold.

Newer polyamide films installed over insulation material may be a better choice,
according to Glenn Singer, managere of building science for CertainTeed's Insulation
Group. CertainTeed's MemBrain vapor retarder, for example, is designed to allow
excess moisture to evaporate and exit the home through tiny pores that change size as
relative humidity changes.

Construction products used in bathrooms are another area for discussion with your
builder. Recent changes to the International Residential Code (IRC) no longer
recognize green boarda commonly used, paper faced drywall productas a suitable
tile-backing material in wet areas like tub and shower surrounds. Instead, an approved,
cement-based backer board like Durock from USG Corporation should be used.

Durock panels are composed of aggregated portland cement sandwiched between
layers of reinforcing glass-fiber mesh, providing a much greater resistance to moisture
and a lower risk of mold growth. Green board products are still suitable for use in
bathroom, laundry room and basement walls.

Air treatment systems are another important consideration for consumers planning to
build a new home, and well worth discussing with your builder. Whole home systems,
like those available from Aprilaire, might include an air cleaner, a humidifier, and a
dehumidifierall of which are installed in conjunction with your new home's heating
and cooling systems.

A purpose-built dehumidifier is more effective at controlling indoor humidity than an
air conditioner, and whole-home units are typically more efficient to operate than
portable models. Humidifier units help provide proper humidity balance throughout
the year, but are particularly helpful during the dry winter months.

Make a checklist of your concerns and ask your builder about how your new home
will be constructed, what construction products will be used, and what steps they'll be
taking to mitigate the likelihood of a moisture retention problem and indoor air
quality issues. Indoor air pollution, humidity buildup, mold and mildew are all
problems that are avoidable, and they're all things you definitely dont want in your
brand new home.

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