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I have done 3 houses built before 1900. All of the same construction. One of the things we did when I hade it sprayed with Closed cell foam insulation from the bottom is not just in between the beams but also along the outer perimeter so that you don't have to stuff the voids with pink insulation. When you would look under the house it was completely covered on foam. The closed cell is almost always done under the house. They might try to sell you on open cell for the walls, in an old structure every bit helps so stay with closed cell. Is more expensive but well worth it. The next project is windows......
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