Poor Indoor Air Quality

Health problems associated with poor indoor air quality include respiratory ailments, allergies, asthma, certain cancers, and heart disease. Individuals react in different ways to indoor air pollution, depending on age, general health, and other factors.Read More..

Proper Ventialtion

Proper ventilation requires adequate air flow through the attic space, and it can be achieved naturally. Warm air rises; cool air descends. A natural ventilation system takes advantage of this natural convection by allowing cool air to enter the attic under the eaves and warmer air to exit the attic at the ridge.Read More..

Potential Savings

The excess heat and moisture caused by poor ventilation can impair the long-term life of all building materials. Outside the home, visible signs of poor ventilation can include cracking and curling shingles, soffits with peeling paint and leak evidence, and (in cool climates) gutter damage from icicles and ice dams.Read More..
The Science of Ventilation

What is growing in your attic?

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The Science of Ventilation

Berkeley Lab – Indoor Air Quality

Berkeley Lab – Indoor Air Quality

Most homes are in violation of residential ventilation building codes

In fact, given the importance of proper home ventilation and the known formula for achieving it, it may seem surprising that one study from the Lawrence Berkeley National Laboratory found that half of American homes showed visible evidence of improper ventilation.
There are a number of reasons why so many homes do not meet even the minimum building standards:

  1. Roof lines have become more complicated on modern homes, resulting in the need for more careful calculation of intake and exhaust.
  2. Technical improvements have been made in exhaust technology, but corresponding improvements in intake technology lag behind. Most full vent soffit products do not allow sufficient intake (NFA) to work with the better modern exhaust products and provide the balanced amount of roof ventilation that is required for most homes.
  3. Due to modern design standards with smaller overhangs, it can be difficult with most soffit products to achieve sufficient intake for the exhaust at the ridge vent.
  4. For aesthetic reasons, center vent soffit is often selected to handle intake. Many center vent soffit products decrease intake, so intake becomes insufficient to balance exhaust.
  5. In many cases, builders do not necessarily follow the minimum building codes through lack of understanding or awareness of proper ventilation, and inspectors may not verify compliance with the codes.


The Actual Cost of Improper Ventilation

$3,200 Additional Energy Costs
Improper ventilation significantly increase a homeowners energy costs— $3,200 over the life of a fifteen year mortgage.
Reduced Effectiveness on insulation
Early Roof Replacement
85,000 Builders Sued Last Year
300% increase in health issues
$3 Billion Mold Remediation Annually