Building code jurisdictions are sometimes reluctant to allow foam insulated attics, since they seldom achieve the R-30 code requirement.  The normal foam depth of 5.5 - 6 inches provides an R-value of around R-22, which is only 73% of the requirement.  However, if a HE...

Homes are being built tighter and tighter.  

That means there's less air infiltrating from

outdoors to dilute funky indoor air.  Funky ?  

You bet !  

Indoor air is compromised by off-gassing of

volatile organic compounds (VOCs) in paint,

carpet, cabinets, etc., as wel...