underlayment - What type of subfloor material is this? - Home Improvement Stack Exchange
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Found some old hardwood (not sure if it's some type of sub-flooring) underneath carpet. It's in pretty rough shape and don't know if it's worth trying to save. We're a pretty handy
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flooring - What is the difference between floor and subfloor? Is subfloor a part of floor? - Home Improvement Stack Exchange