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Shop Gifts for the tile installer in your life
Shop Gifts for the tile installer in your life
Ardex 8+9 Rapid Waterproofing and Crack Isolation Compound - TileTools
Ardex 8+9 Rapid Waterproofing and Crack Isolation Compound - TileTools
Ardex 8+9 Rapid Waterproofing and Crack Isolation Compound - TileTools
Ardex 8+9 Rapid Waterproofing and Crack Isolation Compound - TileTools

Ardex 8+9 Rapid Waterproofing and Crack Isolation Compound

SKU
by Ardex
$108.39 - $111.11
$108.39
$108.39 - $111.11
$108.39
Choose a Color

ARDEX 8+9™ Rapid Waterproofing & Crack Isolation Compound – Gray & White

Protect tile installations with ARDEX 8+9™, a high-performance two-part rapid waterproofing and crack isolation system trusted by tile professionals. This solvent-free, cement-based membrane delivers waterproofing and crack isolation in as little as 90 minutes, making it the ideal solution for time-sensitive projects like showers, kitchens, bathrooms, and wet rooms.

Available in Gray or White to suit a wide range of design and substrate needs.

Features and Benefits

  • Fast Track Installation
    Ready for tile in just 90 minutes—accelerates jobsite efficiency and minimizes downtime.

  • Quick Flood Testing
    Allows flood test in as little as 4 hours after the second coat—ideal for residential and commercial showers.

  • Crack Isolation
    Bridges in-plane substrate cracks up to 1/8" (3 mm) without compromising performance.

  • Color Options
    Choose from Gray or White to coordinate with tile layout or visibility preferences.

  • Generous Coverage

    • Commercial Unit (2 parts): Up to 300 sq. ft.

    • Kit: Approx. 100 sq. ft. (based on two coats over drywall)

  • Versatile Use
    For interior and exterior walls and floors, including bathrooms, showers, steam rooms, kitchens, balconies, and more.

  • Compatible with ARDEX Mortars
    Provides strong bonding surface for ARDEX tile and stone mortars.

  • Solvent-Free Formula
    Acrylic liquid + cementitious powder—low VOC, easy to apply with roller or brush.

  • Efflorescence Barrier
    Reduces migration of salts from substrate to tile surface.

  • Shower Pan Liner Alternative
    Meets code requirements and replaces traditional PVC liners in many installations.

Mixing & Coverage Instructions

Mixing Ratios

  • Mix 1 (Paintable Consistency)

    • 1 gallon (3.78 L) ARDEX 8 to 9 lb. (4 kg) ARDEX 9

    • Small batches: 1 part ARDEX 8 to 1 part ARDEX 9 by volume

  • Mix 2 (Slightly Thicker for Detail Work)

    • 2/3 gallon (2.5 L) ARDEX 8 to 9 lb. (4 kg) ARDEX 9

    • Small batches: 2/3 part ARDEX 8 to 1 part ARDEX 9 by volume

Surface Coverage

Surface Type Two Coat Coverage
Drywall Up to 100 sq. ft.
Concrete Approx. 70 sq. ft.

Performance Specs

Specification Value
Pot Life Up to 45 minutes
Drying Time (Coat 1) 30–45 minutes
Drying Time (Final Coat) Approx. 60 minutes
Flood Test Readiness 4 hours after second coat
VOC 0
Storage Cool, dry area (avoid freezing)
Shelf Life 12 months (sealed container)
Warranty ARDEX Standard Limited Warranty

Applications

  • Residential & commercial showers, wet rooms, bathroom floors & walls

  • Steam rooms and saunas

  • Balconies, exterior decks, and terraces

  • Kitchen backsplashes, countertops, and prep areas

  • Ideal for over cement board, drywall, concrete, and masonry substrates

More Details

ARDEX 8+9™ Rapid Waterproofing and Crack Isolation Compound, in a sophisticated gray finish, is an innovative, two-component system designed to provide unparalleled waterproofing and crack isolation for floors and walls. This solvent-free, cement-based membrane is quick to set, allowing for tiling within 90 minutes and flood testing in just 4 hours, significantly accelerating project completion times. Ideal for both commercial and residential applications, it offers exceptional coverage, extending up to 300 sq. ft. in commercial units and 100 sq. ft. in convenient kits. Whether you're renovating a bathroom, shower, or kitchen, ARDEX 8+9™ in Gray provides a robust, flexible, and waterproof coating that adheres excellently to ARDEX tile and stone mortars. It's not only easy to apply but also combats efflorescence from the substrate, enhancing the durability and aesthetic of your installation. Available in both Gray and White, it caters to various design needs and can be used as an effective alternative to traditional shower pan liners for indoor and outdoor applications, making it a versatile and reliable choice for professionals.

What's Included
Manufacturer

ARDEX Americas is a leading provider of innovative building systems. We develop, manufacture, and distribute high-performance specialty building products, including flooring solutions, concrete repair, self-leveling underlayment, moisture control systems, tile adhesives, grouting systems, screeds, surface preparation, waterproofing solutions, and decorative concrete. As a family-owned company, ARDEX prioritizes local customer interaction, ensuring jobs are done right the first time to specification and on schedule while minimizing risk and costly callbacks. Our commitment to excellence is backed by industry-unique warranty systems covering products and labor costs.

Let customers speak for us

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