Acoustical building panel and surface covering systems utilizing the same

An acoustic building panel having a first major surface opposite a second major surface and a side surface extending there-between, the acoustic building panel comprising:

• a body having an upper surface opposite a lower surface and a side surface extending there-between;
• a backing having a first side opposite a second side and comprising denim web and a low-melt polyester bicomponent fiber;
• wherein the first side of the denim web backing is in contact with the upper surface of the body;
• ammonium sulfate;
• wherein the denim web backing has a web basis weight from about 1150 to about 1350 g/m2;
• wherein the denim web is present from about 65% to about 75%, by weight of the backing;
• and
• wherein the low-melt polyester bicomponent fiber is present from about 10% to about 35%, by weight of the backing.

An acoustic building panel having a first major surface opposite a second major surface and a side surface extending there-between, the acoustic building panel comprising:

• a body;
• a backing comprising denim web and a low-melt polyester bicomponent fiber comprising copolyester polyethylene terephthalate/polyethylene terephthalate (coPET/PET) present from about 10% to about 35%, by weight of the backing;
• and
• wherein the denim web backing has a web basis weight from about 1150 to about 1350 g/m2, and wherein the acoustic building panel has an NRC value of about 0.65 to about 0.9.