Healthy Indoors Magazine - USA Edition

HI May 2014

Healthy Indoors Magazine

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Page 38 of 57

Healthy Indoors 39 Long-time IAQ industry consultant John Lapotaire provides a detailed look at the Good, the Bad, and the Ugly aspects of SPF in the first of his four-part series for Healthy Indoors Magazine Spray Poly Foam Part-2 ally seal your home with the intent of preventing air infiltration and exfiltration. Infiltration is the unintentional introduction of outside air into a building, typically through cracks in the exterior walls, ceilings, attics, and through use of doors and windows; exfiltration refers to unintentional loss of indoor air to the outside through similar mechanisms. In layman's terms, SPF helps prevent unconditioned outdoor air from getting into your home and conditioned indoor air from escaping your home. In typical newer U.S. homes, about one-third of the HVAC energy consumption is due to infiltration, so reducing air infiltration saves energy bucks by making it easier for your home's HVAC system to heat, cool, and maintain your indoor thermal comfort. The incurred energy savings are therefore the direct result of substantially reduced air infiltra- tion and exfiltration due to the sealing capabil- ity of the SPF insulation. Your home's HVAC system now only has to contend with the newly sealed indoor environment, including the now "Is Spray Polyurethane Foam Insulation right for you?"

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