Patent ID: 7906205

Claim:
A sound-absorbing structure selected from ceilings and wails and comprising a plurality of substantially abutted, sound-absorbing, elements in the form of tiles or panels having, an acoustic absorption coefficient aw of at least 0.7, filler which is cast and cured between the elements whereby the filler and the elements provide the structure with a substantially flat surface and a physically or chemically cured, porous, monolithic rendering bonded to and extending substantially entirely over the substantially flat surface and which is smooth and the structure has an acoustic absorption coefficient aw of at least 0.6, wherein the cured monolithic rendering comprises particulate material bonded by physically or chemically cured bonding agent wherein the particulate material consists of particulate material having a maximum dimension below 2 mm and a particle size distribution which allows for the achievement of the defined smoothness, and wherein the porous, monolithic rendering has open pores which interconnect the substantially flat surface on which the rendering is disposed with an opposing front surface of the rendering.