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Addendum 1 <br />5. It has been brought to my attention that the acoustical tile specification basis for design is no <br />longer produced by Celotex. Please provide an alternate specification for the ceiling tile. Provide <br />ceiling tile from Armstrong, Celotex, or approved equal to Specification Section 09511 and the <br />below product requirements. <br />Part 2 Products <br />2.3 WATER -FELTED, MINERAL -BASE ACOUSTICAL PANELS FOR ACOUSTICAL PANEL CEILING <br />Provide panels complying with ASTM E 1264 for Type III, mineral base with painted finish; Form <br />2, water felted; and pattern as follows: <br />If retaining last option in first paragraph below, indicate color designation with manufacturer's <br />name and product name or designation in "Available Products" or "Products" Paragraph above <br />or indicate on Drawings or in a schedule. <br />Color: White. <br />LR: Not less than 0.85. <br />NRC: Not less than, 0.80 <br />CAC: Not less than 35. <br />Tegular Edge <br />Thickness: 5/8 inch (15 mm). <br />Size: 24x48 and 24 by 24 inches (610 by 610 mm) As indicated on Reflected Ceiling Plan. Match <br />existing ceiling tiles for each size. <br />