CGC - 1/2" Durock™ Glass-Mat Tile Backerboard, 4' x 5' CGC Durock™ Brand Glass-Mat Tile Backerboard is designed as a tile substrate that is ideal for moisture and mold-resistant areas. With a coated fiberglass-mat front and back, the panel consists of a treated water-resistant gypsum core, with a proprietary cementitious coating that adheres like cement board but is as easy to use as a regular gypsum board. Benefits are: Moisture- and mold-resistant substrate Scores the highest achievable rating (10 out of 10) for mold resistance according to ASTM D3273. Ideal as a tile substrate for wet areas. Lightweight and easy to score, snap, and fasten Exceptional tile bond performance due to proprietary cementitious coating. Data Sheet