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Sagging creaking floor

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  • Sagging creaking floor

    My house is a 1920 mill house with a bathroom/laundry added later (not sure when). The floor in the laundry room has started to sag and creak when stepped on. I went under the house and the floor seems straight and sturdy, so I suspect there are multiple floor layers and there is a gap between them causing the top layer to sag.

    What would be the best way to fill in the gap between the floor layers without tearing everything apart? I had an idea of maybe drilling a small hole and spraying some of that expanding foam in there but you have to wait 48 hours for it to full cure and we kinda need to be able to walk on it since it leads to the bathroom...
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