Air Leakage is a term used to describe the unintentional leakage & infiltration of air into or out of a structure, system, or item. For example, the NFRC has an optional rating () that manufacturers can elect to list on their labels for this. The lower the AL value, the less air will pass through the […]

Al is the symbol for Aluminum which is a common material used not only in cars, planes, soda cans, but also in the building industry.  It is a soft yet lightweight metal that gets its dull silvery appearance from the oxidation that quickly occurs when it is exposed to air. Amazingly after this initial oxidation, it resists […]

Air Leakage (AL) is an optional rating that manufacturers can elect to list on their NFRC label. The lower the AL value, the less air will pass through & correspondingly that includes the heat loss and gain caused by infiltration through cracks in the assembly. For More

ASTM aka the American Society for Testing and Materials, is an organization that sets many of standards related to testing procedures, protocols & materials.

AV can stand for either Audio Visual Equipment or Adjusted Volume. The Adjusted Volume is a means of determining the energy efficiency of a regular refrigerator / freezer combo. As a freezer is colder than a refrigerator and yet they use the same condenser, etc… they have to account for the additional power required. they do […]

Batt insulation generally consists of fiberglass or a mineral wool product which generally comes in a roll. It may come faced or unfaced and typically is sized to fit standard framing cavities. Correct installation & enclosing it on all six sides is crucial to its performance.

A bearing point is a point where structural weight is concentrated and then transferred to the foundation

A bearing wall is one that supports loads in addition to its own weight.