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beep41 OP t1_j1qzjil wrote

To the best of my knowledge it's the subfloor, the 1st floor has the same thing and we can see the underside in the basement.

The house is from the 1850's, so it's very old.

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hamsterdave t1_j1r6lg9 wrote

I think I agree with the guy above. I think it was the original floor, there may not be a true “subfloor” in the way we think of it now. In my family’s mid-19th century house, there’s a lot of thick hardwood plank straight on the joists.

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