How does foam control moisture and condensation?
Convection currents is the main culprit in causing damaging moisture with the building envelope. Warm moist inside air circulates and exchanges with cold dry outside air in a cavity insulated with fibreglass. This moisture in the air condenses forming dew within the insulation. This decreases the effectiveness significantly of the fibreglass and in turn will cause it to mold and rot. Sprayfoam creates an air tight seal allowing no air movement through the wall resulting in no condensation and no moisture problems. What is the R Value in foam? R value is a number that supposed to indicate a materials ability to resist heat loss. It is derived by taking the “k” value of a product and dividing into the #1. The k value is the actual measurement of heat transferred through a specific material. The test used to produce the”K” value is an ASTM test. The ASTM test was designed by a committee to give us a measurement value that they thought would be meaningful. This test was only designed for f
