Description
Overview
ARDEX 8+9 is a two-component, cement-based membrane for topside waterproofing and crack isolation beneath tile and stone. Mixing ARDEX 8 liquid with ARDEX 9 powder produces a flexible coating that can be applied with a roller or brush and bonds to ARDEX setting mortars.
Features
- Solvent-free system for appropriate interior and exterior floors and walls.
- Rapid drying helps keep tile installations moving.
- When properly installed, helps reduce substrate efflorescence and is IAPMO-certified for shower-pan use.
What's Included
- Convenient kit: 1 gallon ARDEX 8 liquid and 9 lb ARDEX 9 powder, gray or white as selected.
- Commercial kit: 3 gallons ARDEX 8 liquid and 27 lb white ARDEX 9 powder.
Specifications
- Components: ARDEX 8 acrylic-based liquid plus ARDEX 9 cement-based powder
- Crack isolation: Minor in-plane cracks: up to 1/16 in. alone; up to 1/8 in. with ARDEX SK MESH
- Convenient-unit coverage: Approximately 100 sq. ft. over drywall or 70 sq. ft. over concrete, two coats
- Commercial-unit coverage: Up to 300 sq. ft.; actual yield varies with substrate
- Initial coat drying: Approximately 30–45 minutes
- Final coat drying: Approximately 60 minutes at 70°F (21°C)
- Flood testing: Minimum 4-hour cure after the final coat
Size Options
- 8+9 Kit - 1 Gallon + 9 Lb Gray Bag
- 8+9 Kit - 1 Gallon + 9 Lb White Bag
- 8+9 Kit - 3 Gallon + White 27 Lb Bag
Downloads
- ARDEX 8+9 Rapid Waterproofing & Crack Isolation Compound Technical Data Sheet
- ARDEX 8+9 Rapid Waterproofing & Crack Isolation Compound Safety Data Sheet (Liquid)
- ARDEX 8+9 Rapid Waterproofing & Crack Isolation Compound Safety Data Sheet (Part 9 Powder)
Applications
For prepared showers, bathrooms, kitchens and other wet areas before tile or stone. Supported interior substrates include concrete, masonry, existing tile, drywall, cement backerboard and suitable exterior-grade plywood. Contact ARDEX for exterior or submerged/pool application guidance.
Selection and Use
- Use both supplied components; do not substitute water for ARDEX 8 or add unapproved additives.
- Apply two coats and detail corners, drains and penetrations as directed in the linked technical sheet. Tile only after the final coat is dry; the approximately 90-minute overall schedule depends on conditions.
- Not a roofing membrane or exterior primary waterproofing over occupied interior spaces.
- Crack-isolation limits do not permit bridging structural cracks or vertical displacement.
