Rim joist, rigid foam, and thermal barriers
I recently read that air sealing the rim joist can be an straight forward way to improve efficiency in your home and is something that can be done yourself. That lead me to this site and the article here:
It states: Most building codes require rigid foam to be protected with a layer of 1⁄2-in. drywall as a thermal barrier.
How do you find out what your specific building code says about this? I’m in Saint Louis County in Missouri but not sure where to even start looking in regards to this.
Currently I have just fiberglass batts stuffed in the cavity and I know they have had mice nesting in some areas in the past. Cutting rigid foam and using expanding foam to seal it in sounds doable, but covering it with drywall adds a whole other level of complexity. Can I add fiberglass batts over the rigid foam to provide the thermal barrier?
About 1/3 of the basement is unfinished laundry and storage area and 2/3 has a drop ceiling below the rim joist and no bedrooms.
Can you help point me to where I can find out what is required if I do this project?
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