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When I first heard about Icynene foam in 1988, I was intrigued. It sounded like a good product — an insulation with the advantages of spray-in-place foams but without the environmental side effects. I was planning a 480- square-foot addition to my home at the time and began to look at Icynene as an insulation option. But, as with any new building product, I approached Icynene with a healthy degree of skepticism. I spent months weighing the advantages and disadvantages before I was ready to try it. I wanted to know what was in it, what kind of fumes it outgassed, what it did when exposed to flame. I compared Icynene to fiberglass, high-density fiberglass,