Bostik Cempolay Self Levelling Compound 20kg

Product Overview

Bostik Cempolay Self Levelling Compound supplied in a 20kg bag. A polymer-modified, protein-free cementitious smoothing compound formulated for levelling uneven internal subfloors prior to installing decorative floor coverings. 

When mixed with approximately 4 litres of clean water, it produces a free-flowing slurry that rapidly finds its own level, eliminating ridges and hollows to create a uniform surface. The compound remains workable for 15-20 minutes at 20 °C and accepts light foot traffic within 2-4 hours, with most floor coverings suitable for installation after around 16 hours. 

Its protein-free composition prevents bacterial growth, ensuring suitability for hygiene-critical environments such as hospitals, food-processing zones, and commercial kitchens. 

Designed exclusively for dry, internal use on concrete, sand/cement screeds, stone, or firmly bonded unglazed ceramic tiles, it must always be overlaid with a decorative finish and is not suitable for calcium-sulphate screeds, adhesive residues, underfloor heating, or use as a wearing surface.

Features & Benefits

• Polymer-Modified Formulation: Enhances adhesion, flexibility, and surface strength on a wide range of internal substrates.
• Quick Setting: Allows light foot traffic in as little as 2–4 hours, reducing project downtime.
• Self-Levelling Action: Flows freely to eliminate ridges and hollows, creating a smooth, even surface with minimal trowelling.
• Protein-Free Composition: Contains no casein or protein, ensuring it does not support bacterial growth and is suitable for hygiene-sensitive areas.
• Ease of Application: Mixes readily with water to form a lump-free slurry with a working time of 15–20 minutes for efficient use.
• Internal Use Only: Formulated solely for dry, internal areas where moisture exposure is controlled.

Applications

• Concrete Subfloors: Provides a smooth, level finish ready for floor covering installation.
• Sand/Cement Screeds: Corrects uneven surfaces to ensure an even substrate.
• Unglazed Ceramic Tiles: Can be applied directly over firmly bonded unglazed tiles to achieve a flat, uniform layer.
• Hygiene and Food Preparation Areas: Ideal for environments requiring resistance to bacterial growth.
• Interior Use Only: Designed exclusively for dry, internal applications.
• Exclusions: Not suitable for calcium-sulphate screeds, underfloor heating systems, or as a final wearing surface.

Installation Guidance

• Surface Preparation: Ensure the substrate is clean, dry, sound, and free from dust, grease, or loose material.
• Mixing: Combine the 20 kg powder with approximately 4 litres of clean water until a smooth, lump-free consistency is achieved.
• Application: Pour the mixed compound onto the prepared surface; it will self-level naturally, with a trowel used as needed to assist flow.
• Curing: Allow to cure before applying further finishes; suitable for light foot traffic within 2–4 hours at 20 °C and generally ready for floor coverings after 16 hours.
• Final Finish: Always overlay with an appropriate decorative floor covering once cured.

Compliance & Performance

• Material Composition: Polymer-modified, protein-free, cement-based compound formulated for internal subfloor levelling.
• Working and Setting Time: Workable for 15–20 minutes at 20 °C; foot traffic permissible after 2–4 hours.
• Floor Covering Readiness: Accepts most resilient, textile, or timber coverings after approximately 16 hours.
• Substrate Suitability: Compatible with concrete, sand/cement screeds, stone, and bonded unglazed ceramic tiles.
• Restrictions: Not suitable for calcium-sulphate screeds, adhesive residues, underfloor heating, or as a final wearing surface.
• Important Note: For internal dry areas only. Always follow the manufacturer’s technical data sheet for precise mixing ratios, application conditions, and curing guidance.