If you spray the underside of a roof deck with SPF insulation, should you vent the attic?

No, the application of SPF insulation to the underside of the roof deck minimizes the potential for condensation. The SPF insulation develops a thermal and moisture gradient that avoids the development of dew point conditions in the attic. Because of this, moisture won’t condense or accumulate and, therefore, does not need to be vented to the exterior.

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