Cemproof Flex

Cemproof Flex is a two-component, flexible cementitious waterproofing product ideal for use in both positive and negative side waterproofing applications and for use direct onto damp surfaces. Once applied and cured, CEMPROOF FLEX provides a non-toxic, flexible and waterproof coating with very high adhesion on those common substrates in construction such as concrete, natural and artificial stone, renders, bricks, concrete blocks, etc
Component A is a water based acrylic resin and Component B is a mortar, based on a mixture of cements, additives and well-graded aggregates.

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  • Features & Benefits
  • Areas of Use

Features & Benefits

  • Provides a fully-flexible coating which ensures waterproofing even in the most severe conditions, resisting high negative water pressure.
  • Excellent adhesion and easy to use. Does not require bonding agents and can be applied on wet surfaces.
  • Resists hydrostatic negative pressure from ground water when used for underground interior application
  • Acts as an anti-fracture membrane between the substrate and other finishing coats applied.
  • Excellent protection for concrete, being both a CO2 and Chlorine barrier and thereby preventing carbonation and electrochemical corrosion.
  • Permeable to water vapour, allows the substrate to breathe.
  • Resistant to abrasion and UV absorption.
  • Withstands atmospheric pollution, corrosive effects of salt water  and freeze/thaw cycles.
  • Non-toxic and chloride-free. Suitable for contact with potable water.
  • Covers shrinkage and hairline cracks of the concrete.
  • Longer lasting that other coatings, avoiding maintenance costs.
  • Environmentally friendly.


Areas of Use

  • Waterproofing and protection of water retaining structures, such as drinking water tanks, reservoirs, water mains and swimming pools.
  • Waterproofing of below-grade structures like basements, retaining walls, foundations, tunnels  subjected to both positive or negative high water pressure.
  • Waterproofing and protection of concrete against carbonation, and chlorine penetration in public works.
  •  Waterproofing balconies, podium decks and where a UV stable abrasion resistant coating is required.
  •  Internal and external waterproofing and protection of new and old buildings.


Consistent with the 50 year history of Crommelin, our management team is committed to providing all customers with sound technical advice, innovative products and acceptance of responsibilities associated with our specifications and systems. Warranties of up to 15 years are issued following Quality Assurance procedures. They consist of tailored specifications, maintenance schedules and on site support. Please contact Crommelin for further information.

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