I've been working with spray-applied and injected polyurethane foam for about 30 years, first as a manufacturer and architect and later as a foam-insulation contractor and consultant. I've insulated hundreds of buildings, from small homes to large commercial and industrial projects. For most of the time I've been in this business, foam has been seen as a high-priced specialty product - one specified only when cheaper, more easily installed materials, like fiberglass batts, couldn't provide the thermal performance needed. Over the past few years, however, polyurethane foam - particularly spray foam - has come into much wider use. Prices have...

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