The attic in our 2004 house has no insulation. Will spray foam irritate my asthma?
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We need insulation for the attic of our 2004 house in Savannah, GA. Currently it has no insulation at all. Our energy bills have been as high as $600 a month from May through September. We have two units in this house and it is about 2,900 square feet. It is fully bricked. We are desperate to do something, but we cannot seem to find anyone to give us an answer about what to do with our attic space. Every contractor I call for an estimate wants to put in spray foam; I have asthma, so I am a
A 2004 house without any insulation in the attic? How is that even possible -- do they not have a building code and inspections down there?
First question -- is one of your HVAC units in your attic? If not -- forget the spray foam and simply get a good air-sealing job done at your ceiling and install blown-in cellulose or fiberglass to R-38.
If you do have an HVAC unit and/or ductwork in the attic, you may want to consider a semi-conditioned attic -- where spray foam is one of the few options. Although rare, I do hear of issues with reactions to spray foam, so if you are sensitive to plastics, you may want to avoid using it.
There are other ways to accomplish the same thing, or you can consider an HVAC “penthouse” to bring the unit itself into the thermal envelope of your home. Be sure your ductwork has an R-8 insulation on it. Insulating at your ceiling level in conjunction with a radiant barrier installed on the bottom of your rafters is another option that is similar in cost and performance.