For high-moisture tiled areas where persistent dampness leads to mould and staining, ARDEX FS-DD is a non-sanded, cement-based tile grout that resists both water absorption and dirt penetration. Formulated with a special hydrophobing agent and ARDEX Grout Shield, this compound keeps joints up to 4mm wide clean and free from fungal or algal growth in internal and external installations.
The non-sanded formulation is highly suited to scratch-prone surfaces such as porcelain and glass tiles. Once cured, the structure of the grout prevents water and dirt residue from seeping into the joint, which maintains colour consistency and reduces the risk of efflorescence. The inclusion of ARDEX Grout Shield actively combats mould growth in wet areas like domestic and commercial showers. For specialized installations on timber floors or within swimming pools, the grout can be mixed with diluted ARDEX Grout Booster to provide the required flexibility and bond strength.
Suitable for grouting wall and floor joints in domestic and commercial wet areas, bathrooms, showers, and external balconies. Compatible tile and stone substrates include:
Ensure tile joints are thoroughly clean, free of dust, and that the tile adhesive has firmly set before grouting. When cleaning off, use a damp, dense sponge working diagonally across the joints. Keep water to a minimum during clean-up to prevent shade variation, efflorescence, and water float. For external installations, protect the unhardened grout from extreme climate conditions during application and throughout the initial curing phase.
Yes, ARDEX FS-DD is specifically designed for wet areas like showers. Its special hydrophobing agent makes it water repellent, preventing water penetration and dirt residue from seeping into joints. It also contains ARDEX Grout Shield to combat mould growth, ensuring a cleaner finish.
Yes, ARDEX FS-DD can be used on timber floors. For these applications, mix it with diluted ARDEX Grout Booster. This additive provides the necessary flexibility to accommodate movement in timber substrates, preventing common grout cracking issues.
ARDEX FS-DD is a fine tile grout suitable for joints up to 4mm wide. Using it within this specification helps prevent shrinkage and maintains improved colour consistency across the tiled area. For wider joints, a different grout product would be required.
No, a separate grout sealer is generally not required for ARDEX FS-DD. It is formulated to be water repellent and dirt resistant. If specific project requirements or client preference demand it, you can apply a sealer after 24 hours.
| Application | Key benefit | Primary trades |
|---|---|---|
| Grouting wall and floor tiles in wet areas like showers | Water repellent and dirt resistant, preventing water ingress and easy cleaning. ARDEX Grout Shield combats mould growth for hygiene. | Tilers, Waterproofers, Builders |
| Internal and external grouting of porcelain, ceramic, or natural stone tiles | Maintains appearance longer with dirt resistance. Suitable for both indoor and outdoor environments. | Tilers, Landscapers, Renovators |
| Grouting on timber floors | Accommodates substrate movement when mixed with ARDEX Grout Booster, reducing cracking risk. | Tilers, Carpenters, Builders |
| Joints up to 4mm wide | Non-sanded formula delivers a fine, smooth finish without shrinkage, enhancing aesthetic appeal. | Tilers, Finishers |
| Areas prone to scratching, such as porcelain | Non-sanded composition prevents scratching delicate tile surfaces during application, maintaining tile integrity. | Tilers, Commercial Fit-out Teams |
Before mixing, ensure tile adhesive is fully set and joints are clean, dry, and free from dust, excess adhesive, or spacers. A clean joint is critical for achieving a full, strong bond and consistent colour.
Add Ardex FS-DD powder to clean water in a clean container. A 20kg bag requires approximately 6 litres of water. Mix with a mechanical stirrer until a lump-free, creamy paste is achieved. Do not add extra water once mixed.
Work the grout into the joints using a rubber grout float or trowel, moving diagonally across the tiles. Ensure joints are fully compacted. Once the grout has firmed up, use a damp, dense sponge to clean the tile surface, again working diagonally.
The grout will be ready for light foot traffic in 5 hours and can accept heavy traffic after 24 hours. Protect from rain or extreme weather in external applications during the curing period. Full cure is achieved in 7 days.
Danger: May cause skin irritation, allergic skin reaction, serious eye damage, and respiratory irritation. Suspected of causing genetic defects and damage to organs through prolonged or repeated exposure.
Wear protective gloves, protective clothing, safety glasses, and face protection. Chemical goggles or a full face shield are required when there is risk of eye contact. Use a suitable respirator with a P2 particulate filter to protect against airborne dust during mixing and application.
Use only outdoors or in a well-ventilated area. Avoid inhaling dust or fumes. Ensure adequate local exhaust ventilation to minimise dust generation, especially in confined spaces.
Store locked up in original, sealed containers in a cool, dry place away from environmental extremes. Protect containers from physical damage. Keep out of reach of children. Dispose of contents and containers at an authorised hazardous waste collection point in accordance with local regulations.
Proper surface preparation is crucial for grout adhesion and preventing common failures like discolouration or staining. Follow these specific instructions for best results.
Surface prep: Ensure joints are clean and free from dust, excess adhesive, and bedding mortar. Remove all tile spacers. Clean and dry the surface.
Primer: Required. These tiles should be sealed prior to grouting to prevent staining from the grout. Check the manufacturer's recommendations for the specific tile type.
Surface prep: Joints must be clean and clear of debris. Confirm the adhesive has fully cured, especially for thick beds, to prevent residual moisture from affecting grout colour or causing discolouration.
Primer: Not required for the grout itself, but always check a small, inconspicuous area for ease of cleaning. Some moisture-sensitive or absorbent tiles may require a barrier or pre-seal to avoid surface discolouration from grout pigments.
Surface prep: Joints must be clean and free from any contaminants. Ensure the tile adhesive has cured fully according to its specifications.
Primer: Required (additive). ARDEX FS-DD must be mixed with diluted ARDEX Grout Booster to provide flexibility for timber floor applications.
| Property | Value |
|---|---|
| Colour Description | Various |
| Mixing Ratio Water | Approx 6 litres water per 20kg powder |
| Mixing Ratio Grout Booster | 6 litres diluted ARDEX Grout Booster (80% Booster:20% water) per 20kg powder |
| Pot Life | 2.5 hours at 23ºC and 50% RH |
| Application Temperature | 5ºC or above |
| Initial Set / Light Traffic | 5 hours at 23ºC and 50% RH |
| Heavy Traffic | 24 hours at 23ºC and 50% RH |
| Full Cure | 7 days |
| Swimming Pool Cure (Chemicals) | 14 days |
| Compressive Strength 14 days | 20 MPa (AS 4992) |
| Flexural Strength 28 days | 6 MPa (AS 4992) |
| Classification | CG1 |
| Underfloor Heating Compatibility | Compatible |
| VOC Content | Extremely low |
| Shelf Life 5kg and 1.5kg | Not less than 24 months |
| Shelf Life 20kg | Not less than 12 months |
Here are some common examples on where Ardex FS-DD Tile Grout 5kg used by our customers.
