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What conditions promote mold?

[THE FOLLOWING EXCERPT IS BROUGHT TO YOU BY NC DEPARTMENT OF HEALTH AND HUMAN SERVICES. TO READ ORIGINAL EXCERPT CLICK HERE]

All mold growth conditions (food sources and appropriate temperatures) are present in the indoor environment with the exception of adequate moisture. Prevention of mold growth indoors can not be achieved without proper moisture control. The following are some of the moisture problems that cause indoor mold growth.

Water Intrusion

Rainwater can enter a building through leaks in walls, windows or the roof. Surface or groundwater may enter when there is poor foundation drainage. Flooding can, of course, cause catastrophic intrusion. In buildings that have slab construction, water can seep or wick up through the cement floor causing mold to grow on carpet pads or carpet backing. The building envelope (walls, windows, floors, roof, etc.) must be well maintained to prevent water from coming in, both to prevent mold growth and to maintain the structural integrity of the building.

Water Vapor

When relative humidity (a temperature-dependent measure of water vapor in air) becomes elevated indoors, building materials and furnishings absorb the moisture. Those damp materials can then provide a good place for mold to grow. If there are no cold-condensing surfaces and the relative humidity (RH) is maintained below 60 percent indoors, there will not be enough water in those materials for mold to grow. However, if the RH stays above 70 percent indoors for extended periods of time, mold will almost certainly grow.

In the summer, air conditioning can de-humidify indoor space. But if the system is too large or too small for the space it serves, the cooling system can create high humidity by cooling without removing water vapor. A properly sized and maintained system will dehumidify and cool a building. Learn more about the role of heating, ventilation and air conditioning (HVAC) systems in indoor environmental quality.

When there are cold surfaces in a building, water vapor can condense on those surfaces, just as water condenses on the outside of a glass of ice water. Insulation of exterior walls can prevent condensation and mold growth during the winter.

You should always be mindful of indoor sources of water vapor that can be problematic. Clothes dryers must be vented to the outdoors. Unvented gas or kerosene space heaters can generate enormous amounts of water vapor (as well as other air contaminants), and should be used sparingly and never as a primary heat source. Always run the bathroom exhaust fan when showering or bathing, and make sure the vent is exhausted to outdoors. A properly vented kitchen exhaust fan can remove steam created during cooking.

Learn more about mold growth conditions and the roles of moisture, mold and biologicals in indoor environmental quality.

For Additional Information

  • California Department of Public Health: Building Dampness, Mold and Health (PDF) External link
  • Centers for Disease Control and Prevention (CDC): Facts About Mold and Dampness (PDF) External link
  • Environmental Protection Agency (EPA): The Key to Mold Control is Moisture Control External link
  • University of Nebraska—Lincoln Extension, Institute of Agriculture and Natural Resources: Identifying Moisture and Mold Sources in Houses (PDF) External link

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What our Customers are saying….

  • 5
    "We have purchased and installed about 11 of the IW25 permanent dehumidifiers, and they are performing very well.  They have remedied our ongoing problem with high RH in certain apartments, and are the perfect solution. The fact that we can install them, set, and forget them is the true beauty of the product! Previously we had tried to manage the problem by supplying portable dehumidifiers, but always had trouble.  Even with the best of intentions, the resident fails to empty the bucket, or turns the portable off because of noise, or some other reason. But the resident quickly forgets the permanent dehumidifier is even there.  It is quieter, out of  the way, and requires no effort or attention from the resident. It's been a great solution for us!"
    Requires no Effort or Attention from the Resident
  • 5
    "As a resident of the north east we experience many days of high humidity throughout the year. I searched the internet until I ran across Innovative Dehumidifier Systems,LLC. I called and spoke with the tech people and a sales representative and decided to purchase their IW-25-4 IN Wall unit it wasn't even on the market yet, it was still in development. I placed the order and within about 5 weeks it was sitting on my porch just as promised. It was very easy to install only took less than a half hour to have it up and running, its working great I'm very pleased with the unit and the folks at Dehumidifier Systems,LLC." -Paul B. Pennsylvania
    Took less than a Half Hour to Have it up and Running
  • 5
    I was unsure how customer support was gonna be at first. But Thank You for being an "A PLUS" company. I'm glad I chose your company.
    “A PLUS” company
  • 5
    "We have installed the IW25-4 In-Wall dehumidifier and quite frankly, I love it.  It is the perfect solution, works great and was easy to install.  I am very happy with your product!" -Christopher L.  
    The Perfect Solution
  • 5
    "You guys are great to work with. Great product, great delivery all around, from customer service to getting the dehus to projects on time, with no damages from shipping. Easy install and great performance. I felt right at home talking with Leah and Brian when I was introduced to the new and improved dehu." -Mr. Jones President / Contractor Multifamily Industry Purchasing Since 2012
    Easy install and great performance.
    Mr. Jones - President/ Contractor
  • 5

    "I am pleased to inform you that I have had a positive experience regarding all aspects of the dehumidifier; performance of the IW25 unit has surpassed my expectations with regard to ability to extract moisture in cool(er) ambient temperatures.  I truly wish there were more US companies with the manufacturing attention to detail and level of customer care and concern that Innovative Dehumidifier has provided.  I'll be spending my money with the Innovative Dehumidifier Company the next time I have the need. 

    Thanks again!" Regards, Travis M. Electrical Engineer
    Surpassed my Expectations…
    Travis M.- Electrical Engineer
  • 5
    "In working with Innovative Dehumidifiers, I was thoroughly impressed with their knowledge. Not only about the product operation, but the installation and specifications. It was a pleasure working with them. And, we have a very satisfied customer. Thank you very much!"
    Superior Customer Service and Assistance
  • 5
    "We have been very pleased with the IW-25. They are easy to install, efficient, quiet, and provide a nice finished look. They provide permanent dehumidification with basically no required maintenance."
    Easy to Install
  • 5
    "The install of the unit was very easy. So far I am more than pleased with the unit and customer service experience I've had with your organization."
    Install of the Unit was very Easy
  • 5
    "We love the units over the competition.  They are quieter, more efficient, smaller, and operate cooler therefore keeping our units cooler for our tenants."
    Quieter, More Efficient, Smaller
  • 5
    "The IW-25 is clearly my first choice for dehumidification when an installed, economical, low maintenance and finished looking solution needs to placed… [Innovative Dehumidifier’s] customer service is hands on- they really know construction. It shows in the design and efficiency of this unit…"
    First Choice for Dehumidification

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Innovative Dehumidifiers Innovative Dehumidifier Systems, LLC, Dehumidifying Equipment, Ocean Isle Beach, NC

Innovative Dehumidifier Systems, Llc.
6260 Ocean Highway W
Ocean Isle Beach, NC 28469

Direct: (910) 579-3348
Fax: (910) 579-4412

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