Cementitious Waterproofing Coating

Cement-based waterproofing certified for potable water contact.

A polymer-modified cementitious waterproofing coating available in rigid, semi-flexible, and fibre-reinforced formulations for varying substrate movement conditions. Mixed with water to a smooth slurry and applied by brush or spray, it bonds tenaciously to concrete, masonry, and render — and is one of the few waterproofing systems certified for direct contact with potable water. The rigid formulation delivers excellent compressive resistance; the semi-flexible grade accommodates moderate substrate movement for bathrooms, pools, and facades.

  • Certified for potable water contact — swimming pools, water tanks, and reservoirs
  • Resistant to negative hydrostatic pressure — applied effectively from the wet side
  • Bonds to concrete, brick, block, render, and stone without primer on most substrates
  • Vapour-permeable — allows substrate to breathe while blocking liquid ingress
  • Fire resistant — inorganic chemistry, zero combustion risk during or after application
  • Suitable for internal use — no offgassing, safe in occupied spaces
  • Swimming pools, fountains, and ornamental water features
  • Potable water tanks, cisterns, and reservoirs
  • Bathroom and wet room internal tanking
  • Basement and below-grade wall waterproofing from the negative side

Download the full product catalogue, or request the TDS and SDS for project specification and approval.

Coverage1.5–2.0 kg/m² for 2 coats (≈1.5 mm dry film)
Cure time between coats3–4 hours at 20 °C
Compressive strength>30 MPa at 28 days
Potable water approvalW270 / W347 compliant (grade-specific)
Application methodStiff brush, roller, or machine spray
Substrate moistureDamp substrates acceptable; no standing water

Indicative values only. Refer to the full Technical Data Sheet for certified specifications. Contact Numastec to request the TDS for this product.

Get a quote or request technical documentation.

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