The nail-down flooring should be nailed to an additional subfloor layer. The subfloor layer must be thick sufficient to make sure that nails don't protrude. The Iso-Stage® flooring underlayment would reside beneath this layer, free from any penetrating nails. Ideally, we would use a material with 5kg/m2 and 10kg/m2. By https://acoustic-floor-underlay45660.ambien-blog.com/45571780/acoustic-floor-underlay-an-overview