CERESIT CE 40 Aquastatic waterproof elastic grout in color Siena is a polymer-modified tile joint filler supplied in a 5 kg package. Formulated for grouting ceramic, porcelain and natural stone tiles, this flexible grout is intended for interior and exterior wet areas where movement and moisture resistance are important. The Siena shade is a warm, medium-brown tone designed to match a variety of tile surfaces and interior palettes.
Advantages
The grout combines elasticity with water resistance to reduce the risk of cracking in joints subjected to thermal expansion or minor substrate movement. Its formulation offers good adhesion to common tile materials and helps prevent water penetration in joints exposed to splashes and condensation. The ready-to-mix powder provides consistent color and ease of application for standard joint widths and produces a durable finish that is suitable for regular cleaning and maintenance.
Suitable for
- Grouting ceramic and porcelain floor and wall tiles in bathrooms and kitchens
- Joints between natural stone tiles where limited movement occurs
- Balconies, terraces and other external areas that require water-resistant joints
- Indoor wet zones such as shower enclosures and laundry rooms
When it may not be suitable
This grout is intended for joints that experience minor movement; it may not be appropriate for large expansion joints or areas with heavy structural movement where flexible sealants or movement joint systems are required. It is not a substitute for waterproofing membranes on substrates that need full system waterproofing under tiles.
Key specifications
- Form: polymer-modified cement-based powder
- Color: Siena (warm medium-brown)
- Package weight: 5 kg
- Application: joints between tiles (walls and floors), interior and exterior wet areas
- Joint width compatibility: suitable for standard tile joint widths (refer to manufacturer guidance for exact ranges)
- Performance: elastic, water-resistant once cured
How to use
Mix the powder with the recommended amount of clean water to obtain a smooth, homogeneous paste. Apply the grout using a rubber float or squeegee, pressing the material firmly into joints and removing excess from the tile surface. After initial set, clean residues with a damp sponge and allow the grout to cure according to the manufacturer’s specified time before exposing the surface to water or heavy use. Follow detailed instructions on mixing ratios, working times and curing conditions provided by the manufacturer.
What to consider before purchase
- Confirm the Siena color matches the tile and desired aesthetic under actual lighting conditions
- Check recommended joint width compatibility for your tiles and substrate movement expectations
- Determine whether a full waterproofing system is required beneath tiles in your project
- Estimate quantity needed based on tile size, joint width and coverage tables
Usage recommendations
Store the product in a dry place and avoid mixing more grout than can be used within the stated working time. For best results, apply at recommended temperatures, protect newly grouted surfaces from water and heavy traffic until fully cured, and follow manufacturer instructions for cleaning and maintenance to maintain color and performance.
