Air Quality Issues From Air Sealing Attic?

Air Quality Issues From Air Sealing Attic? #green

If I air seal the ceiling plane of a client's attic using canned spray foam, caulk, rigid foam, etc. what is the chance I'll cause an indoor air quality issue because the house no longer has sufficient ventilation? Most of the homes I work with are at least 15 years old. I realize in an ideal world you would do before/after blower door testing and all the combustion appliances would have dedicated air intakes but that just isn't a financial possibility for my clients. My gut feeling is that these homes are so leaky in other areas other than the attic plane that they still won't be "tight" in any real sense after attic air sealing. Interested to hear if anyone else has any experience with this. Thank You for your advice.

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