Usually this occurs because the framers kept the 16" or 24" OC convention and the last joist, spaced per convention, was less than 16" or so from the rim. If the joists are sandwiched together then I could see it being for strength. The ways people make houses baffles me.
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Chipping away on a daily basis.
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You know you're an ecorenovator if anything worth insulating is worth superinsulating.
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S-F: "What happens when you slam the door on a really tight house? Do the basement windows blow out?"
Green Building Guru: "You can't slam the door on a really tight house. You have to work to pull it shut."
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