[Icemaster]

It's tough to tell from what's here. The type of hand work on the joists suggests early work, as do the nails. But, there's no way to really tell for certain if these are parts that might have been salvaged and reused, or if they're from the original construction.

What's the foundation? Have you looked inside any of the walls? Whats it look like there? What does teh rest of the lumber look like? Hand hewn or sawn?

A lot of it can also depend on where you live and the type of neighborhood/houses that yours was when it was first built. Higher end houses used higher end tchnology, same as today. You never know, could have been the builder/owner got a deal on some logs and saved some bucks by hand-hewing the bigger more expensive pieces. Interesting story though. Don't know what to make of the insulation thing.