NBS Source
Stop Mould Flexible Wall Grout


Suitable for internal and external applications.


Stop Mould is a fine, smooth finish grouting material for internal and external tiling joints up to 5 mm wide.

Features and benefits:

  • Stop Mould contains Rock-Tite polymeric binders, making it ideal for use with all types of tile including glass where it has excellent adhesion characteristics.
  • The product needs only the addition of water, high flexural strength makes it ideal for dry lined walls and surfaces subject to vibration and durability, such as power showers.
  • Stop Mould grout contains Norcros Stop Mould Anti Bacterial Fortification to protect against the build up of mould and the discolouration of grouting.
  • The grout is water resistant but not impervious to the passage of water.
  • In areas of potential water ingress, preparation of the surface with Norcross Wet Seal should be considered.
  • Where an impervious joint is required Norcros Super Epoxy Grout should be used.
  • Conforms to classification BS EN 13888 CG2.

General information




Pr_20_31_53_64 Polyester resin groutsPrimary


M40/10 Natural stone covering to

M40/110 Tiling to

M40/115 Natural stone covering to

M40/120 Mosaic to

M40/5 Tiling to

Specification data - Polyester resin grouts Enhanced data

Working time

at 20°C.

Approx. 2 hours.

Setting time

at 20°C.

Approx. 24 hours.


1kg will fill joints of approx. 4m² of 150mm x 150mm x 6mm tiles with 2mm wide joints or 1.5m² of 20mm x 20mm x 4mm mosaics with 2mm spacing.


Store in dry interior conditions away from direct sunlight between 5°C and 30°C The product has a shelf life of 12 months from date of manufacture.

Norcros Stop Mould Flexible Wall Tile Grout is a cement-based grout and as with all cement containing products the surface may be susceptible to the formation of efflorescence/soluble salts. These salts may be removed once the grout has fully dried and cured by frequent washing with clean water or a suitable efflorescence cleaner.

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