Healthy Indoors Magazine

HI June 2014

Healthy Indoors Magazine

Issue link: https://hi.iaq.net/i/327414

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Spray Poly Foam Part-3 "Build it Tight and Ventilate it Right" Healthy Indoors 47 Long-time IAQ industry consultant John Lapotaire provides a detailed look at the Good, the Bad, and the Ugly aspects of SPF in the third of his four-part series for Healthy Indoors Magazine even help reduce the workload on your HVAC system thanks to its high R-value and efficiency. In fact, with spray foam, HVAC sizing can be reduced as much as 35% without the loss of ef- ficiency or comfort. That being said, with some luck you've already read my previous articles and have asked some very critical questions prior to making your final decision about insulation. Not all insulation products are created equally and the differ- ences between SPF insulation and blown or batt insulation go well beyond the R-value and energy savings. SPF reduces your home's air leakage and infiltration, which is great for ener- gy efficiency but might not be so great for your indoor air quality (IAQ) if the application is done without proper consideration of the changing ventilation needs of your home post-application. When you reduce your home's air leakage or air infiltration rate by insulating with SPF, you are also substantially reducing its air change rate (ACH), which can lead to the accumula- tion of volatile organic compounds (VOCs) and other harmful substances in your home. By far,

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