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Spray Foam Technical FAQs
when spraying form onto the rafters in my attic should I have ridge vents or do I need any opening in my attic at all to the out side?

You have several options when insulating your attic. You can place the insulation on the attic floor only which is your typical vented attic design. Another option is to place all the insulation on the underside of your roof deck and gable walls. In this case you would not have insulation on your attic floor and you would close up all your attic vents. You would not want to have any vents to the outside or that would be similar to keeping your windows open all the time. Your attic space would now be part of your conditioned space. Those are your most common methods but not all of them. Take a look at some of the other FAQs on this site for more information on unvented attics.

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Jason M. Hoerter, P.E.
Sr. Product Manager

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