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How to prevent bathroom mold

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Mold and rot are dangers that can develop anywhere in your house. But the bathroom, which generally contains more moisture than any other room in the house, is a particularly ripe target. Mold and rot can cause health problems and do serious damage to your house, so itís best to take steps to prevent them.

The first signs of mold are darkened wood, water stains on your ceilings and water marks around bath vents. When you detect mold in your bathroom, you should address it quickly, before it spreads further. Pay attention to exhaust fans and vent ducts, where condensation will frequently collect.

Bathroom insulation is a common place for mold to take up residence. If you replace your insulation, pick something with a high R-value ó higher numbers mean more effectiveness. Spray insulation is generally better than fiberglass. You also want some kind of vapor barrier around the insulation to protect it from condensation. Some building codes actually require it.

Your biggest solution to a moisture problem is a bathroom exhaust fan. If you have an exhaust fan already, inspect it and make sure itís functioning properly. Make sure it vents to the outdoors, rather than the attic. An exhaust fan venting to the attic can cause problems to fester for months or years, and attract not only mold and rot but termites and pests.

Clean your exhaust fan regularly. Itís not a difficult job; simply turn off main power to your bathroom, locate the fan, remove the vent cover, then remove the fan blade if possible. (Take care of those screws ó you wonít want to lose them!) Use mild soap and warm water to clean both the cover and both sides of the fan blade. Let them fully dry before reinstalling them. While theyíre drying, inspect the vent and clean whatever you can reach. If you need a quick fix and donít want to take the assembly apart, blow the fan and vent with canned air. It wonít get rid of all debris, but itís a quick refresher.

If you want to replace your exhaust fan, or install a new one, make sure you hire the right person for the job. Some localities and states allow handymen to do this job, but some require a licensed electrician. Youíll pay between $165 and $350 for this work.

When hiring, ask them the right size fan you need. All ventilation fans have an airflow rate measured in cubic feet per minute (CFM). The Home Ventilating Institute recommends one CFM per square foot of bathroom area. Add 50 CFM for each toilet, shower and tub. You might need a higher-rated fan for a bathroom with a particularly high ceiling.

Some fans are louder than others; be sure to buy one with a noise level you can live with.

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