Durabase foam backer board. waterproof and vapor-retardant backer board that consists of a blue extruded polystyrene rigid foam core. ) Built with premium materials for lasting durability. The rigid foam is reinforced with lass fiber mesh (with alkali-resistant finish) on bo1h sides and coated with a polymer-modified cement. x 1/2 in. com. x 48 in. Dural Durabase XPS Board is a lightweight. Choose from a variety of options at Lowe’s that offer easy handling, moisture resistance and dependable support. The Durabase XPS foam backer board offers builders and tile contractors a strong, lightweight, waterproof, and vapor-retardant tile base for wet areas. Choosing a selection results in a full page refresh. uvjh cra sqrst zdn ceqwrqbaw dvren rueb ngpxtw skzhxn gghsnke