Flexible waterproof grout CERESIT CE 40 Aquastatic white — 5 kg

CERESIT CE 40 Aquastatic white — 5 kg is a flexible waterproof grout designed for sealing tile joints in wet and moisture-prone areas. Supplied in a 5 kg package, this grout forms an elastic, water-resistant seal suitable for ceramic, porcelain and mosaic tiles. It is formulated to provide long-lasting joint integrity where regular movement or exposure to water occurs, combining water repellence with flexibility to reduce cracking and water ingress.

Advantages

The grout provides a flexible, elastic joint seal that adapts to minor substrate movements and thermal expansion without losing adhesion. Its waterproof formulation reduces the risk of moisture penetration through joints, making it appropriate for showers, bathrooms and wet kitchens. The white color offers a neutral, clean finish that complements many tile types and patterns while maintaining stain resistance typical for cement-based polymer-modified grouts.

Suitable for

• Sealing joints between ceramic wall and floor tiles
• Porcelain tiles and glazed mosaics in wet rooms
• Shower trays, bath surrounds and splashbacks
• Kitchens where occasional splashing or humidity is present
• Areas requiring flexible joints to accommodate minor movement

When it may not be suitable

This grout is intended for use in tile joints and is not a substitute for full-area waterproof membranes or structural waterproofing on substrates that require system-level protection. It may not be suitable for joints wider or narrower than the manufacturer’s recommended joint width range or for applications where chemical resistance beyond typical household detergents is required. For floors exposed to continuous heavy loading or industrial chemicals, consider a product specified for those conditions.

Key specifications

• Color: white
• Package weight: 5 kg
• Type: flexible, polymer-modified cementitious grout
• Application: tile joints for ceramic, porcelain and mosaics
• Performance: waterproof / water-repellent joint
• Suitable environments: wet rooms such as bathrooms, showers and kitchens

How to use

Prepare substrate and tiles ensuring joints are clean, dry and free of adhesive residues. Mix the grout with the recommended amount of clean water to a homogeneous, lump-free consistency and allow it to slake briefly if advised by the manufacturer. Apply into joints using a rubber float or grout trowel, pressing firmly to completely fill the joint voids. Remove excess grout from tile surfaces with a damp sponge before initial set, then finish with a clean cloth when grout has hardened enough to avoid smearing. Allow the grout to cure for the time stated by the manufacturer before regular exposure to water.

What to consider before purchase

• Confirm the required joint width and compatibility with tile type and substrate.
• Ensure the white color is appropriate for your tile design and future maintenance (cleaning and potential discoloration).
• Estimate quantity needed based on tile size, joint width and area to grout to determine number of 5 kg packs required.
• Verify that a flexible, waterproof grout meets project waterproofing requirements or whether an additional membrane is necessary.

Usage recommendations

Use CE 40 Aquastatic white for indoor wet areas where flexible, water-resistant joints are required. Maintain recommended mixing ratios and curing times, protect fresh grout from direct water exposure during cure, and perform routine cleaning with non-abrasive, mild detergents to preserve appearance.