The nail-down flooring need to be nailed to a further subfloor layer. The subfloor layer should be thick more than enough in order that nails don't protrude. The Iso-Stage® flooring underlayment would reside under this layer, cost-free from any penetrating nails. I always work to produce an airtight seal against https://kirkm381efc1.wikibestproducts.com/user