Check the listing for details. Ardex S1-K One-Component Waterproofing & Crack Isolation Membrane. Condition: New. Listed at 150.67 USD. Ardex S1-K One-Component Waterproofing & Crack Isolation Membrane ARDEX S 1-K™ One-Component Waterproofing and Crack Isolation Membrane is an easy-to-use, single-component, load-bearing waterproofing compound that produces a flexible, positive-side waterproof coating for all common interior building substrates requiring protection from topside water exposure that could damage tile installations.It also provides an excellent bonding layer for ARDEX tile and stone setting materials. ARDEX S 1-K can also be used for crack isolation up to 1/8 (3 mm)*. ARDEX S 1-K is for use over concrete, masonry finishes, existing tile, drywall, plaster, cementitious backerboards and plywood on interior floors and walls. Features: Flexible, topside waterproofing for interior floors and wallsVery easy-to-apply, 2-coat system; paint roller or brush Easy to install with a paint roller or brush Use for bathrooms, showers and other wet areas prior to the installation of tile Highly workable consistency; minimal drips and splatters Crack isolation up to 1/8" (3 mm) Size 37316 Payments Shipping Returns