Benefits and Types of Foam

There are several types of foam available on the market. Most people think of open cell and closed cell foam as their only choices but spray foam is available in many different densities and cell structures. They have different uses but share a number of benefits.

A home insulated with foam is energy efficient, quiet and healthy.


–  seals the building and stops drafts and noise.
–  insulates the building with high R-values and superior energy performance.
–  keeps out pollutants and improves indoor air quality.
–  contains no fibers that can become airborne and cause an allergic reaction.
– polyurethane foam is a plastic and as such will not support mold growth.


We choose our foam based on the application. Our spray foam is water-blown and uses no ozone depleting blowing agents:

Open cell spray foam (R = 3.5 per inch, installed weight 0.5 pound per cubic foot). Expands at a dramatic rate, typically 100:1, and is highly vapor permeable. Because of its relatively low R-value per inch, it requires deep cavities. Half pound foam has approximately 90 percent open cells and 10 percent closed cells.

Semi-closed cell spray foam (R = 4.8 per inch, installed weight 1 pound per cubic foot). Our foam of choice for most residential wood construction. It has great R-value and excellent vapor control properties. One pound foam has approximately 50 percent open cells and 50 percent closed cells.

Closed cell spray foam (R = 6.6 per inch, installed weight 2.0 pounds per cubic foot). Provides a vapor barrier and tolerates moisture extremely well. Used below grade and on masonry walls. Two pound foam has approximately 10 percent open cells and 90 percent closed cells. Our closed cell foam is water blown and contains no ozone-depleting propelling agents.

Air Krete retrofit foam (R = 6 per inch, installed weight 2 pounds per cubic foot – see for more information).). Ideal for insulation of existing wall cavities where spray foam cannot be used. Air Krete is a light-weight foam in which magnesium oxide is used to maintain the cellular structure. It contains no petrochemical components, is non-allergenic and will not burn. It can be used in wood, block and masonry walls with excellent results.