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Bostik Cempolay Deep Self Levelling Compound 20Kg – Pallet Deals and Bulk Buy

Bostik Adhesives and Levellers - Terrific Pallet Deals and Bulk Buy

Bostik Cempolay Deep Self Levelling Compound


Bostik Cempolay Deep is a protein-free, high strength, high performance deep self-levelling compound based on a blend of cements and organic binders. It is suitable for raising floor levels and levelling uneven sub floors in light to heavy duty internal applications. The versatility of Bostik Cempolay Deep allows for application between 5 – 50mm thicknesses in a single step.

It is ideal for smoothing/levelling of concrete, sand/cement screeds and unglazed ceramic tiles. It is also ideal for filling uneven floors and forming sloping screeds. However this product is not suitable for use on mastic asphalt.

It is suitable for use with warm water underfloor heating provided a temperature of 27°C is not exceeded. The heating must be switched off for at least 48 hours before and after application.

  • Self Levelling & Resurfacing Compound
  • Can be Poured up to 50mm Deep
  • Suitable for the Direct Laying of Vinyl
  • Suitable for use with Underfloor Heating
  • Unit size: 20Kg bag

Bostik Cempolay Deep Self Levelling Compound further information


Approx. 2.7m² at 5mm thickness
Approx. 1.35m² at 10mm thickness
Approx. 0.65m² at 20mm thickness
Approx. 0.27m² at 50mm thickness

Bostik Cempolay Deep product characteristics

FormDry, free-flowing powder
CompositionBlend of cement, organic binders and
Specific Gravity1.7 approx
Product Code30812527
Storage/Shelf LifeStore for up to 6 months from date
of manufacture when stored in the
original, unopened packaging, clear of
the ground, under cool, dry
conditions within the temperature
range of +5°C to +25°C. Protect from
frost and excessive draughts.

Bostik Cempolay Deep typical performance data

24 hours before application:

Maintain a room temperature of
between 13°C to 18°C.

During application:

Maintain a subfloor temperature of at
least 5°C.

Maintain a room temperature of
between 13°C to 18°C not exceeding
CoverageApprox. 2.7m² at 5mm thickness

Approx. 1.35m² at 10mm thickness

Approx. 0.65m² at 20mm thickness

Approx. 0.27m² at 50mm thickness
Working Time20 minutes after mixing at 20°C
At 28 days > 35N/mm²
Drying TimesFoot traffic:

1.5 hours at 20°C
3 to 4 hours at 10°C

Ceramic tiles/textile coverings:

3 to 4 hours (<10mm thickness) at

24 hours (>10mm thickness) at 20°C

6 to 8 hours (<10mm thickness) at
48 hours (>10mm thickness) at 10°C

Vinyl floor coverings: 24 hours per 10mm thickness at 20°C

Note: Drying/covering time will be
extended at lower temperatures.


1. All phases of installation should comply with the latest editions of:

BS CP102 Code of Practice for protection of buildings against water from the ground.
BS 5325 Code of Practice for installation of textile floor coverings.
BS 8203 Code of Practice for installation of resilient floor coverings.

2. Wear protective gloves, clothing and eyewear.

3. The freshly applied compound should be protected from rain, frost, high temperatures and conditions
causing rapid drying.

4. Ensure the subfloor temperature remains above 5°C throughout application and during drying.

5. Ensure the subfloor is clean, sound, dry and free from contaminants which may hinder adhesion, including
surface hardeners, additives, oils, grease adhesive residue etc.

6. Ensure there is an effective damp-proof membrane that conforms to BS 8203: 1987.

7. Prime porous surfaces with Bostik Cempolay Universal Primer / Bostik SBR diluted with 2 parts water. Allow to dry before applying Bostik Cempolay Deep.

8. Prime non-porous surfaces with undiluted Bostik Cempolay Universal Primer / SBR and apply Bostik Cempolay Deep while it is still tacky, usually about 30 minutes. If it has dried apply a further coat of Bostik
Cempolay Universal Primer / Bostik SBR.

9. Any cracks should be cleaned out and filled a suitable patch repair mortar.

10. The subfloor should be tested in accordance with British Standards using a properly calibrated and insulated hygrometer. A reading of 75% RH or less confirms that the subfloor is satisfactorily dry.

11. Suitable for installations with fully commissioned underfloor heating, provided a surface temperature of 27°C is not exceeded. The heating must be switched off for at least 48 hours before and after application.

12. Suitable under parquet/wood floors > 5mm.


14. Accurately measure 3.5 litres of clean cold water into a suitable clean mixing container and gradually add 1 x
20kg bag of Bostik Cempolay Deep powder, mixing continually with an electric stirrer until a smooth lump-free mixture is obtained. This will normally be achieved within 2 minutes. Do not under mix.

15. Once a smooth lump free mixture has been achieved mix for a further 2 minutes.

16. Do not mix more compound than you can use within 20 minutes.

17. Do not re-temper or add further water.


18. Pour the mixture onto the prepared sub-floor, as a continuous operation and allow to flow to obtain a
smooth finish.

19. Spread evenly to the required thickness using a steel trowel.

20. Bostik Cempolay Deep can be applied from 5mm up to 50mm thickness in one application.

21. Protect surface from traffic prior to laying a floor covering.

22. Avoid application in high temperature as this may result in rapid setting and poor flow. The rapid loss of
water may increase the risk of cracking.

23. A subfloor temperature of at least 5°C should be maintained throughout the application. A room temperature of between 13°C to 18°C should be maintained for at least 24 hours prior to application, whilst ensuring that a maximum room temperature of 25°C is not exceeded during application.

24. Bostik Cempolay Deep is suitable for application by pumping.

25. Under no circumstances should the smoothing compound be force dried as this may affect the curing from direct sunlight and through draughts which may cause localized accelerated curing. The working time of the compound will be reduced at higher temperatures.


26. Clean tools and equipment immediately after use with warm soapy water.

27. Whilst it is still wet, surplus adhesive must be removed from surrounds and tiled surfaces.

28. Remove bulk using a rubber squeegee.

29. Remove the residue of uncured material using a damp cloth.

Bostik Cempolay Deep PRECAUTIONS IN USE

The Mix ratios and temperatures need to be followed accurately. Changing the mix ratios will disrupt the system
and risk product failure. An effective membrane is required to prevent water entering the system.


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Overall rating out of 16 Google reviews

Phil Down
3 hours ago

They actually answered the phone, were polite, knowledgeable and the order was delivered in full and on time. Would fully recommend both on price and service. Thank you.

3 weeks ago

BTP very helpful in supplying a pallet of floor leveller. I needed it on the Saturday, but didn’t want it sitting on the driveway for several days. I called and they recommended ordering for Thursday to give a day’s grace in case of any delivery issues. In the event the pallet arrived on Thursday as requested. Reliable and good value

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2 months ago

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Adrian W
4 months ago

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4 months ago

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Boon Teo
4 months ago

Great prices with a good ranges of products . Customer Service is excellent!

Max Simpson
5 months ago

Very helpful!

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3 years ago

Peter Bostock
3 years ago

I purchased a pallet of these and I am very impressed from ordering to receiving my pallet and the delivery guys were very helpful as well .I will definitely recommend and use this company again .Highly recommend

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3 years ago

Amazing knowledge and great prices! Definitely using these guys on a regular basis for my pallet deals on levellers and adhesive

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3 years ago

Fantastic experience with Buy The Pallet. Everything I needed to complete a large flooring project, quick delivery & quality products.

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3 years ago

Great service and really good pricing! Super fast delivery and really lovely guy!

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