Product Codes

  • Grey 30608882 - 20kg bag
  • White 30626372 - 4.75L polyjerry


Approx. 4m2 to 5m2 per bag at 3mm depth Approx. 2.5m2 per bag at 5mm depth (depending on the smoothness of the floor surface & application technique)
30608882 - 20kg bag 30626372 - 4.75L polyjerry
Blend of specialist cement and polymer liquid
+5°C to +27°C
2mm to 12mm
Up to 20 minutes after mixing (depending on ambient temperatures)
Light foot traffic: approx. 2 hours. Floor coverings: approx. 4 hours
Store and transport securely. Store for up to 6 months from date of manufacture in original, unopened packaging, clear of the ground, in cool, dry conditions within the temperature range +5°C to +25°C and out of direct sunlight. Protect from excessive drafts, frost, damp, condensation and dew.
Powder and liquid
Typically 16N/mm² after 28 days
Typically 6N/mm² after 28 days
Clean tools and equipment with warm soapy water immediately after use

Key Features

Exceptional flow & adhesion
Moisture tolerant
Suitable for use over most adhesive residues


Bostik SL C955 ADVANCED is a high performance, two-part cementitious underlayment which offers excellent adhesion on most subfloors without priming. It is particularly suitable for use over old adhesive residues (including bitumen and carpet tile tackifiers).

Bostik SL C955 ADVANCED smooths and levels subfloors prior to installing all types of floor coverings. It can be applied over most common substrates including: old bitumen, ceramic tiles, flooring grade plywood, concrete, sand/cement screeds, stone, rigid metal, terrazzo (take care to degrease and prepare surface), quarry tiles, asphalt and other strong, rigid subfloors. It is ideal for use where low-odour products are required.

Bostik SL C955 ADVANCED is specially formulated to be used in conjunction with waterborne underfloor heating systems and can also be used to encapsulate electric cable type heating. Due to its high adhesion and low shrinkage properties, it can be used without a primer onto most substrates in both domestic and commercial locations.

Bostik SL C955 ADVANCED is ideal for refurbishment projects and may be applied onto firmly bonded  thermoplastic tiles which have been installed on bituminous adhesives. Tiles must be stable, clean and degreased.

Case Study
Bostik – Flooring in Healthcare
Bostik – Flooring in Healthcare
Technical advice and quality subfloor preparation products and flooring adhesives from Bostik are said to have enabled the progress of the new hospital building.
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