Fast90® Self-Adhering Tile Underlayment consists of a premium quality organic mat, impregnated with asphalt saturant, then coated with a high-grade weathering asphalt and surfaced with ceramic granules to protect against UV, weathering and physical damage. It has a self-adhering compound on the bottom side and on the side lap, utilizing a highly adhesive SBS modified asphalt protected by a split-back release liner for easy installation.
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