Cementseal Data Sheet

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Cementseal is a two component, polymer modified cement based waterproof coating for concrete and masonry, with excellent adhesion to prepared substrates. Cementseal Primer is required for all horizontal applications, and is also used on porous surfaces, prior to applying Cementseal.

 

 

Tough Waterproof Coating

The product cures to form a durable, highly alkaline, tough waterproof coating which acts as a sealer and protects the concrete, or other substrates, from water penetration and carbon dioxide diffusion.
Cementseal may be used internally or externally, to provide Type A (barrier) protection; as classified in BS8102:2009.

Typical Uses of Cementseal

  • Basements & sub-structures
  • Podium decks
  • Balconies & terraces
  • Inverted roofs
  • Temporary waterproofing

Features & Benefits of Cementseal

  • Totally waterproof
  • Resists up to 100m head of positive and negative water pressure
  • Seamless and fully bonded
  • Applied to damp surfaces
  • Abrasion and impact resistant
  • Quick and easy to apply by hand or spray
  • Suitable for horizontal, vertical and overhead applications
  • Environmentally friendly
  • Enhanced resistance to carbonation

Cementseal Case Studies

  1. Our Lady’s Convent High School, Hackney
  2. National Archive for the British Film Institute
  3. Sloane Square Wine Cellar London

Cementseal Downloads

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Cementflex 1

Cementflex 1
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Cementseal 2

Cementseal 2
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Cementseal 3

Cementseal 3

gcpat.uk | United Kingdom customer service: +44 (0) 1480 478421

© Copyright 2026 Saint-Gobain Construction Chemicals UK Limited. All rights reserved. This document is only current as of the last updated date stated below and is valid only for use in the United Kingdom. It is important that you always refer to the currently available information at the URL below to provide the most current product information at the time of use. Additional literature such as Contractor Manuals, Technical Bulletins, Detail Drawings and detailing recommendations and other relevant documents are also available on www.gcpat.uk. Information found on other websites must not be relied upon, as they may not be up-to-date or applicable to the conditions in your location and we do not accept any responsibility for their content. If there are any conflicts or if you need more information, please contact GCP Customer Service.

Last Updated: 2026-03-22

https://gcpat.uk/en-gb/solutions/products/cementseal-data-sheet