8912 Ardex Waterproofing/Crack Isolation Compound Commercial Kit

SKU: 8912
Manufacturer: Ardex





Please select options before adding to cart


Ardex 8+9 Rapid Waterproofing and Crack Isolation Compound Commercial Kit

Ardex's 8+9 two component waterproofing and crack isolation compound is the best-in-class roll-on membrane for use on all common substrates before tile and stone installation. This cement based product is very easy to use and provides an outstanding bond to mortars.


  • Commercial kit includes: ARDEX 8 (liquid): 3 gallon (11.34 liters) bottle and ARDEX 9 (powder): 27 lb. (12 kg) bag
  • Available in gray and white
  • Ideal for use in showers, kitchens and exterior manufactured veneer stone installations
  • For commercial and residential applications prior to tile and stone installation
  • Tile installation in just 90 minutes
  • Flood test in only 4 hours
  • 1/3 the cost per square foot vs. competitive products
  • 25 warranty on a two-coat application every time
  • IAPMO Certified, ANSI A 118.10

Application Guide

  1. Ensure that you have the appropriate tools and the sufficient amount of ARDEX 8+9™ Rapid Waterproofing and Crack Isolation Compound.

    Coverage (2 coats):
    • Drywall – 100 sq.ft.
    • Concrete – 70 sq.ft.

    ARDEX 8+9 requires a solid substrate that is clean, dry and free of oils, grease, wax, latex compounds, curing compounds, dust and all foreign matter. Do not install below 50°F (10°C) surface temperature.

    1. MIX 1 – Caulking Consistency - Mix a small amount of ARDEX 8+9™ to a lump-free caulk-like consistency for filling holes, gaps and joints. Always pour liquid into the mixing container first and then the powder. Working time is approximately 45 minutes at 70°F/21°C.
    2. Crack Isolation - Use MIX 1 to fill around floor or wall penetrations, corner and floor/wall joints and dormant cracks up 1/8” before installing ARDEX SK MESH™. The unused portion of the trowel grade MIX 1 mixture can be blended back with the balance of the remaining powder and liquid for use in the next step, MIX 2.
    3. MIX 2 – Paintable Consistency - Mix ARDEX 9 (powder) with one unit of ARDEX 8 (liquid). For best results, mix with an ARDEX T-2 Ring Paddle and a low speed drill. Always pour liquid into the mixing container first and then the powder. Mix thoroughly to obtain a lump-free, pourable mixture. Coat the entire area evenly with a paint roller or brush and allow thorough drying (30 to 45 minutes). A second layer is required to obtain a waterproof membrane, and must be applied at a 90° angle to the first coat.
    4. Tiles can be fixed onto the second coat of ARDEX 8+9™ after one hour at 70°F/21°C. Use ARDEX MICROTEC™ Thin Set Mortars ARDEX X 77™ and ARDEX X 32™( for stone), ARDEX X 5™ or ARDEX X 4™ directly onto ARDEX 8+9™, all of which are suitable for porcelain, non-porous and glass mosaic tiles. ARDEX X 4 is suitable for tiles for internal applications only.

Questions & Answers

Be the first to Write a question

Ratings & Reviews

No reviews available

Be the first to Write a Review