Patent ID: 6837014

Claim:
A prefabricated underlay material for location between an upper surface of a load-bearing floor and a parquet or other continuous surface material, which underlay material comprises: a substantially flexible first sheet material having a first surf ace with a surface area; dampening projections formed of porous resilient material on at least said first surface of the first sheet material, distributed along said first surface and having a total projection area less than said area of the first sheet material, wherein: said first surface extends continuously and flat beneath the dampening projections and in the area between them; and said dampening projections formed of porous resilient material: are made of a foamed polymer or polymer mixture bonded to said flat first surface by effect of its/their material properties at the time for manufacture; and are principally straight continuous or intermittently continuous strips located with intervals, or substantially undulating continuous or intermittently continuous strips located with intervals; the underlay material further comprising a substantially flexible second sheet material having a third surface to which said porous polymer(s) forming the dampening projections is also bonded by effect of its/their material properties at the time of manufacture, and which second sheet material is located on the opposite side of the dampening projections relative to the first sheet material.