m2 of acoustic insulation against impact noise of floors in new construction using a 3.4 mm high-tenacity polyester felt anti-impact sheet joined to a bituminous protection, with high resistance to compression, tearing and puncturing, TEXFON type; overlapped using the self-adhesive tab intended for this purpose that is incorporated into the product; protected with a 4-5 cm reinforced mortar sheet. Reduction of the impact noise level: ΔLw = 22 dB.