Identify the Cause of Mold
How to Identify the Cause of a Mold and Mildew Problem
Mold and mildew are commonly found on the exterior wall surfaces of corner rooms in heating climate locations. An exposed corner room is likely to be significantly colder than adjoining rooms, so that it has a higher relative humidity (RH) than other rooms at the same water vapor pressure. If mold and mildew growth are found in a corner room, then relative humidity next to the room surfaces is above 70%. However, is the RH above 70% at the surfaces because the room is too cold or because there is too much moisture present (high water vapor pressure)?
Mold growing outdoors on firewood.
Molds come in many colors; both white and black molds are shown here.
The amount of moisture in the room can be estimated by measuring both temperature and RH at the same location and at the same time. Suppose there are two cases. In the first case, assume that the RH is 30% and the temperature is 70oF in the middle of the room. The low RH at that temperature indicates that the water vapor pressure (or absolute humidity) is low. The high surface RH is probably due to room surfaces that are "too cold." Temperature is the dominating factor, and control strategies should involve increasing the temperature at cold room surfaces.
In the second case, assume that the RH is 50% and the temperature is 70oF in the middle of the room. The higher RH at that temperature indicates that the water vapor pressure is high and there is a relatively large amount of moisture in the air. The high surface RH is probably due to air that is "too moist." Humidity is the dominating factor, and control strategies should involve decreasing the moisture content of the indoor air.
Why is mold growing in my home?
Molds are part of the natural environment. Outdoors, molds play a part in nature by breaking down dead organic matter such as fallen leaves and dead trees, but indoors, mold growth should be avoided. Molds reproduce by means of tiny spores; the spores are invisible to the naked eye and float through outdoor and indoor air. Mold may begin growing indoors when mold spores land on surfaces that are wet. There are many types of mold, and none of them will grow without water or moisture.
Our customers are coming from:
Aliso Viejo - Anaheim - Anaheim Hills - Balboa Island - Bell Canyon - Brea - Buena Park - Capistrano Beach - Corona Del Mar - Costa Mesa - Coto de Caza - Cypress - Dana Point - Dove Canyon - El Toro - Foothill Ranch - Fountain Valley - Fullerton - Garden Grove - Huntington Beach - Irvine - La Habra - La Palma - Ladera Ranch - Laguna Beach - Laguna Hills - Laguna Niguel - Laguna Woods - Lake Forest -Las Flores - Los Alamitos - Midway City - Mission Viejo - Modjeska Canyon - Monarch Beach - Newport Beach - Newport Coast - Orange - Placentia - Rancho Santa Margarita - San Clemente - San Juan Capistrano - Santa Ana - Seal Beach - Silverado - Stanton - Sunset Beach - Trabuco Canyon - Tustin - Villa Park - Westminster - Yorba Linda
San Diego County
Carlsbad (Aviara, La Costa) - Chula Vista - Coronado - Del Mar - El Cajon - Encinitas (Cardiff-by-the-Sea, Leucadia, Olivenhain) - Escondido - Imperial Beach - La Mesa - Lemon Grove - National City - Poway - Oceanside - San Diego - San Marcos - Santee - Solana Beach - Vista
Los Angeles County
Agoura Hills - Alhambra - Arcadia- Artesia- Avalon- Azusa- Baldwin Park- Bell- Bell Gardens- Bellflower- Beverly Hills- Bradbury- Brentwood- Burbank- Calabasas- Carson- Cerritos- Claremont- Commerce- Compton- Covina- Cudahy- Culver City- Diamond Bar- Downey- Duarte- El Monte- El Segundo- Gardena- Glendale- Glendora- Hawaiian Gardens- Hawthorne- Hermosa Beach- Hidden Hills- Huntington Park- Industry- Inglewood- Irwindale- La Canada Flintridge- La Mirada- La Puente- La Verne- Lakewood- Lancaster- Lawndale- Lomita- Long Beach- Los Angeles (County Seat)- Lynwood- Malibu- Manhattan Beach- Maywood- Monrovia- Montebello- Monterey Park- Norwalk- Palmdale- Palos Verdes Estates- Paramount- Pasadena- Pico Rivera- Pomona- Rancho Palos Verdes- Redondo Beach- Rolling Hills- Rolling Hills Estates- Rosemead- San Dimas- San Fernando- San Gabriel- San Marino- Santa Clarita- Santa FE Springs- Santa Monica- Sierra Madre- Signal Hill- South El Monte- South Gate- South Pasadena- Temple City- Thousand Oaks- Torrance- Vernon- Walnut- West Covina- West Hollywood- Westlake Village- Whittier
Aguanga - Anza - Banning - Beaumont - Bermuda Dunes - Blythe - Cabazon - Calimesa - Canyon Lake - Cathedral City - Cherry Valley - Chiriaco Summit - Coachella - Corona - Desert Center - Desert Hot Springs - Hemet - Homeland - Idyllwild - Indian Wells - Indio - La Quinta - Lake Elsinore - Mecca - Menifee - Mira Loma - Moreno Valley - Mountain Center - Murrieta - Norco - North Palm Springs - Nuevo - Palm Desert - Palm Springs - Perris - Pine Cove - Quail Valley - Rancho Mirage - Riverside -
Romoland - Rubidoux - San Jacinto - Sky Valley - Sun City - Temecula - Thermal - Thousand Palms - Wildomar - Winchester