Q: I just purchased an older home with a couple of separate crawlspaces and would like to know the best way of insulating this area.
A: By crawlspace I assume you mean underneath a home. If you are going to insulate under a floor and you have 16″ or 24″ on-centers, my insulation expert recommends using unfaced friction-fit batts with what professionals call lightning rods.
These are metal rods about the thickness of a metal coat hanger with pointed ends about two inches longer than the interior joist space. You can stick these up an unfaced batt and then install a lightning rod every 18″ or so to hold up the insulation. This is a very fast and easy installation.
You could also nail plywood or lattice boards to the bottom of the floor joists, but again are a lot more expensive than lightning rods. Some people use netting, but that is a lot more work.
In some areas they call the room in the attic a crawl space. If you mean in your attic, blown insulation to a value of R-30 or greater is recommended.
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