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View Product ReviewsBostik Cempolay Self Levelling Compound 20kg
Bostik Cempolay Self-Leveling Compound smooths and levels internal subfloors up to 6mm, sets quickly in 2-4 hours, and is ideal for concrete, sand/cement screeds, and unglazed ceramic tiles.
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Product Overview
Bostik Cempolay Self-Leveling Compound smooths and levels internal subfloors up to 6mm, sets quickly in 2-4 hours, and is ideal for concrete, sand/cement screeds, and unglazed ceramic tiles.
Delivery & Returns Information
All delivery charges are shown in your basket and are dependent on the total value of items in your basket based on product category.
This charge is based on delivery to mainland UK excluding the following postcodes: AB, CF, DD, DG, KW, IV, LD, LL, NP, PH, SA and SY. If your delivery address is in any of these postcode areas a member of our customer service team will contact you prior to processing your order should an additional delivery charge apply. We do not offer deliveries outside the UK mainland.
Standard (Nationwide) Delivery
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Core Products Core
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|---|---|
| ORDER VALUE | DELIVERY CHARGE |
| Under £300 ex. VAT | £25 ex. VAT |
| Over £300 ex. VAT | FREE |
Core Delivery charges apply only when all products in an order that have equivalents are accepted as such. If even one product cannot be substituted with an equivalent, the entire order will not qualify for Core Delivery charges.
| Timber & Sheet, Building Materials, Joinery and Gardens & Landscaping Products | |
|---|---|
| ORDER VALUE | DELIVERY CHARGE |
| Under £100 | £20 ex. VAT |
| Between £100 - £250 ex. VAT | £15 ex. VAT |
| Over £250 ex. VAT | FREE |
| Insulation, Plasterboard and Drylining Products | |
| ORDER VALUE | DELIVERY CHARGE |
| Under £150 | £50 ex. VAT |
| Between £150 - £400 ex. VAT | £35 ex. VAT |
| Over £400 ex. VAT | FREE |
| SuperFOIL and YBS products | |
| ORDER VALUE | DELIVERY CHARGE |
| Each item | £10 ex. VAT |
| Over £350 ex. VAT of 1 brand | FREE |
| Screws & Fixings and Adhesives & Sealants | |
| ORDER VALUE | DELIVERY CHARGE |
| Under £100 | £7.50 ex. VAT |
| Over £100 ex. VAT | FREE |
Express Delivery
| Express Delivery - Insulation and Plasterboard & Drylining | |
|---|---|
| ORDER VALUE | DELIVERY CHARGE |
| Under £400 | £50 ex. VAT |
| Over £400 ex. VAT | £35 ex. VAT |
| Express Delivery - Timber & Sheet, Building Materials, Joinery and Gardens & Landscaping Products | |
| ORDER VALUE | DELIVERY CHARGE |
| Under £300 | £50 ex. VAT |
| Over £300 ex. VAT | £35 ex. VAT |
Returns
We offer a 30 day returns policy on any faulty products.
Key Features
- {{more_time}} Fast levelling
- {{snowshoeing}} Quick walk-on
- {{calendar_view_day}} Smooths and levels internal subfloors
- {{gpp_good}} Protein-free, hygiene-safe
Technical Specification
| Bag Type: | Paper |
|---|---|
| Bag Size: | 20kg |
| Sales Unit: | Bag |
| Sales Unit Coverage: | 20kg |
| Brand: | Bostik |
| Weight: | 20kg |
| Colour: | Grey |
| Status: | Non-Returnable |
Technical Downloads
What Is Bostik Cempolay Self-Leveling Compound?
Bostik Cempolay is a polymer-modified, protein-free cementitious smoothing compound supplied in 20kg bags.
Gauged on site with around 4L of clean water, it becomes a free-flowing slurry that quickly finds its level, eliminating ridges and hollows in minutes.
Once mixed, the compound stays workable for 15-20 minutes at 20°C, accepts light foot traffic in 2-4 hours, and is generally ready for most resilient, textile or timber floor coverings after about 16 hours.
Because it contains no protein or casein, Cempolay does not support bacterial growth, making it suitable for hygiene-critical areas such as hospitals, commercial kitchens, and food-processing zones.
It is designed solely for dry, internal substrates-concrete, sand/cement screeds, stone, and firmly bonded unglazed ceramic tiles-and must always be over-laid with a decorative floor finish.
The product is not suitable for calcium-sulphate screeds, residual adhesive residues, underfloor-heating systems, or use as a wearing surface.
Applications
Bostik Cempolay is ideal for preparing various internal subfloor types, ensuring a flat and even base for your chosen floor finish.
- Concrete Subfloors: Provides an excellent smoothing layer over existing concrete.
- Sand/Cement Screeds: Effectively levels and prepares traditional screeds.
- Unglazed Ceramic Tiles: Can be applied directly over unglazed ceramic tiles to create a uniform surface.
- Hygiene and Food Preparation Areas: Its protein-free formulation makes it a safe and suitable choice for environments requiring strict hygiene standards.
- Interior Use Only: Specifically formulated for internal applications.
- Not for Underfloor Heating: Important to note it is not suitable for use with underfloor heating systems.
Benefits
- Quick Setting: Rapid hardening allows for foot traffic in as little as 2-4 hours, significantly speeding up project completion.
- Self-Levelling & Smoothing: Naturally flows to create a flawlessly smooth and flat surface, eliminating ridges and hollows.
- Protein-Free Formulation: Ensures suitability for sensitive environments like hygiene and food preparation areas.
- Easy to Use: Designed for straightforward mixing and application, catering to both professional and DIY users.
- Convenient Pack Size: Available in a 20kg bag for easy handling and efficient coverage.
How to Use (General Guidance)
- Preparation: Ensure the subfloor is clean, dry, sound, and free from loose material, dust, grease, and other contaminants.
- Mixing: Mix the Cempolay powder with the specified amount of clean water until a smooth, lump-free consistency is achieved. Follow the manufacturer's instructions precisely for water ratios.
- Application: Pour the mixed compound onto the prepared subfloor. It will self-level, but a suitable trowel or spreader can be used to aid flow and achieve the desired thickness.
- Curing: Allow the compound to cure. Foot traffic is typically possible within 2-4 hours, with final floor coverings able to be laid after 24 hours, depending on environmental conditions and thickness.
Always refer to the official Bostik technical data sheet and instructions on the product packaging for precise mixing ratios, application guidelines, and specific curing times before use.
