Duradek. Designed for use under exterior tile decks and roofs, Tiledek anti-fracture membrane is an approved roofing membrane with fabric laminated to the topside. Tiles can be securely bonded to the fabric-covered membrane using thinset mortar. The 60 mil membrane offers waterproofing benefits and crack isolation to accommodate some movement in the structure without damaging the tile. 800.338.3568. www.duradek.com.