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Putting attic AC unit in insulated enclosure vs. spray foam

8 years ago

I'm having some discussion with my builder about the type of insulation I would like to use in my project. Based on my research, I really like the idea of spray foam insilation, but my builder doesn't seem to like the idea. He claims his houses are very tight with the use of fiberglass batting and caulking the gaps. Since the 2nd AC unit is in the attic, I like the idea of using spray foam on the roof deck and insulating the whole attic. My builder said he puts the AC unit inside an insulated enclosure and that he doesn't see the point of insulating the whole attic. What do you guys think about this? Should I push for spray foam?

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