Dont forget about baloon framed houses (common pratice back then). The floor joists are comonly only nailed to the side of the wall studs. the wall studs in baloon framing run the entire hight of the house, so with a flash light in the atic you should be able to determine if this is the case.
Bolth my house(95 yrs old) and my brothers(120 yrs old) are framed this way. On the up side it makes rewiring alot easier.
good luck, do your detective work.
Steve,
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diy it if you can
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