California seems to be one of the only states (if not the only) that has not yet adopted the International Building Code, so Quenda Behler Story's example of unvented attics in the article "Alternative Materials and Code" (Legal, 7/06) works in our state for now.

The story might give the impression that this is still an unproven method or is considered an "alternative design," but in fact unvented attics are now part of the IBC (R-806.4). Our company sprays closed-cell spray foam insulation in unvented ceiling assemblies almost every day, so we are constantly explaining the physics,...

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