About the product
ARDEX 8+9 is Ardex's leading two-component waterproofing membrane — powder (ARDEX 9) + dispersion (ARDEX 8) which are mixed to create a flexible, tileable, and waterproof membrane under ceramic, stone, and similar coverings. Applicable with a roller (fluid consistency) or a trowel (thixotropic consistency). The professional solution for waterproofing under finishes in bathrooms, showers, kitchens, terraces, and balconies. Available in 5 kg+5 kg and 20 kg+20 kg kits.
What areas and uses is it ideal for?
- ✓ Bathrooms, restrooms, and showers — waterproofing before tiling
- ✓ Kitchens and laundry rooms — areas with frequent water exposure under the covering
- ✓ Terraces and balconies — exterior waterproofing under ceramic tiles
- ✓ Swimming pools, spas, and wet areas in commercial facilities and hotels
- ✓ Properly prepared mortar, concrete, plaster, or plasterboard floors and walls
Why choose ARDEX 8+9
- ✓Two-component — maximum reliability membrane — the combination of ARDEX 9 powder and ARDEX 8 dispersion creates a cement-polymer membrane with high flexibility and superior adhesion compared to conventional one-component membranes
- ✓Tileable — ready for tiling on top — the dry membrane can directly receive ceramic adhesive; no additional treatment is needed before laying the covering
- ✓Two consistencies — roller or trowel depending on the application — by adjusting the mixing ratio, a fluid consistency is obtained for roller application on flat surfaces, or a thixotropic consistency for trowel application on vertical walls and thicker areas
- ✓Fast commissioning — drying of each coat in 2-4 hours at 20°C; allows for waterproofing to be completed and tiling to begin on the same day under optimal conditions
- ✓Indoor and outdoor — total versatility — suitable for both interior wet areas and exterior waterproofing under ceramic tiles on terraces and balconies
Coverage according to application method
| Method | Mixture per m² (2 coats) | Ideal use |
|---|---|---|
| By roller (fluid) | ≈ 0.75 kg powder + 0.75 kg dispersion = 1.5 kg/m² | Flat floors, large surfaces |
| By trowel (thixotropic) | ≈ 1.6 kg powder + 1.2 kg dispersion = 2.8 kg/m² | Walls, vertical areas, greater thicknesses |
How to apply — 4 steps
- Prepare the substrate: clean, firm, and free of dust, grease, and loose particles. For very absorbent substrates, apply ARDEX primer beforehand.
- Mix ARDEX 8 + ARDEX 9 in the proportion indicated according to the chosen method (roller or trowel). Mix thoroughly until homogeneous.
- First coat with a roller, brush, or trowel. Ensure complete coverage. Pay special attention to corners, junctions, and joints.
- Second coat applied crosswise once the first coat is dry to the touch (≈ 2-4 h). Wait for complete drying before tiling.
Technical specifications
| Type | Two-component cement-polymer waterproofing membrane |
| Components | ARDEX 8 (dispersion) + ARDEX 9 (powder) |
| Application | Roller · Trowel · Brush |
| Use | Interior and Exterior |
| Tileable | Yes — ceramic, natural stone, cementitious materials |
| Drying per coat | Approx. 2–4 hours at 20°C |
| Color | Light grey |
| Formats | Kit 5 kg + 5 kg · Kit 20 kg + 20 kg |



















