Armstrong Ceilings 12 in x 12 in Impression 40 Pack White Textured Surface Mount Acoustic Ceiling TIles Weed and Vegetation Killers 45 Product Length (in 45 Product Length (in Those are the criteria that guided us in creating the Riley collection plaster or popcorn ceilings Maximizes ceiling height Installs directly to your existing ceiling or joists with the Armstrong® Easy Up® track (1190) and clip (1191SC) system or adhesive (Henry® 237 adhesive) Beveled tongue and groove edge detail (no visible grid) Covers 40 sq ft per carton (40 pieces per carton) Class A fire rating ) 28 Paintable No Package Quantity 40 Fire Resistant Yes Sag Resistant No Mold Resistant No Mildew Resistant No Color Finish Family White Manufacturer Color Finish White Warranty 10 year limited Recessed No Acoustic Yes Material Mineral fiber Type Tile UNSPSC 30161600 Common Measurement (L x W) 12 in x 12 in Square Footage Per Piece (Sq