Acoustic Ceiling Tile — 2x2 Lay-In (NRC 0.55+)

Acoustic ceiling tile: mineral fiber, fiberglass, or recycled content. Standard: 2x2 ft or 2x4 ft lay-in (tegular or square edge). Grid: 15/16 in exposed tee (Armstrong Prelude, USG DX/DXL). NRC (Noise Reduction Coefficient): 0.55-0.90 (higher = more absorption). CAC (Ceiling Attenuation Class): 33-42 (higher = more sound blocking between rooms). Fire: Class A (ASTM E1264), non-combustible core. Light Reflectance: 0.83-0.90 (white). Humidity: sag-resistant for spaces up to 90% RH. Height: standard accessible ceiling 8-10 ft. Seismic: bracing per ASCE 7 for SDC C+ (compression struts, 12 ft spacing). Cost: $1-$4/sf (tile), $2-$5/sf (grid installed). CSI 09 51 13.