What can I use as an air barrier under an old wood floor with no sub floor?

Mimi Costley
Updated: Nov. 6, 2021

This is an old house 1860 with 1910 addition. The old wood floors have no subfloor and on first floor, that is above a dirt floor basement. Since we have access to the floor from the basement I want to put up something that will block airflow through the floor. A bit of insulation would be a plus. I think it should also allow moisture to pass through. I would rather put it between the floor joists (> 2" x 10", 2' on center, oak hard as rock) and not cover them up. I have considered homosote.  Any suggestions?

Thanks, Mimi

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