Spray foam insulation in your home or business will improve air quality. A continuous, airtight seal prevents pollutants such as dust from invading a structure. Spray foam insulation exceeds all building codes for air barrier systems. In addition, spray foam insulation does not contain any loose particles that may adversely affect indoor air quality. Medium density spray foam insulation is also mould and moisture resistant, a particular concern when insulating a below grade structure such as a basement.