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Maintaining buildings under positive pressure relative to outdoors can help to maintain indoor air quality by limiting the infiltration of outdoor…



Maintaining buildings under positive pressure relative to outdoors can help to maintain indoor air quality by limiting the infiltration of outdoor air that may adversely affect thermal comfort and may contain moisture and pollutants. Allowing air to move freely and unimpaired from room to room in the conditioned areas of a home is essential. Balanced pressure helps maintain consistent temperatures without placing abnormal stress on the envelope.

Many normal household items can work against your ventilation system. Some of these include the stove vent, clothes dryer, and bathroom fan. The function of each these is to remove air from the home and push it to the outside. This can create a negative pressure in the home. If the proper amount of make up air is not supplied by the design, the negative pressure in the home will draw the air from uncontrolled areas. The uncontrolled make-up air can be from a crawlspace, cracks in the foundation, leaky window seals, the water heater flue and the chimney. When air is pulled in through the water heater flue, chimney or furnace flue, carbon monoxide is also being pulled into the home, this is called “back-drafting“. Uncontrolled air from the crawlspace or foundation cracks can contain radon, moisture, and other contaminants.

The proper system design will take into account household items that could create a back-drafting situation.


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Crawl Space Sealing in Alpharetta, GA

We recently moved into a new house and the crawl space was very moist and unusable. We had the guys at HealthyAir come and put in a vapor barrier to seal it off. They recommended we use a dehumidifier and insulation to really make it protected for good. We can now use it for our extra storage.

Shannon And Chris R – Alpharetta, GA 30004
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Chronic Fatigue Prompts a Neighborly House Call

As a professional certified mold remediator, I have been remediating buildings and performing mold inspections for seven years. I live in a neighborhood about eight years old. One Saturday, a neighbor was out walking her dog while I was working in the yard and stopped to chit chat a few minutes. She was familiar with the work I do and began to tell me she believed her home was making her sick – something I often hear in my line of work.

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