NEW Mapeguard ® UM Underlayment membrane for ceramic and stone tile Call today to learn more about Mapeguard UM: 1-800-42-MAPEI. Underlayment solutions for tile and stone installation • Uncoupling, waterproofing and water vapor membrane • Fast Track Ready™ : Approved for use over young (green) concrete and mortar beds • Approved for use with polymer- modified mortars • Prevents transmission of in-plane substrate cracks up to 1/8" (3 mm) • Reduced “roll memory” and unique tri-layer construction keep membrane flat • Engineered cavity design with mesh allows easy single-pass filling of surface core • Extra Heavy Rating: ASTM C627 • Light green translucent color allows visibility of mortar coverage • Laser and chalk lines are easily visible on the surface