Fosroc Nitocote CM210

Fosroc Nitocote CM210 is a cementitious coating, used for waterproofing water retaining structures and water excluding structures.

Best Uses

Fosroc Nitocote CM210 two-component polymer modified cementitious coating is supplied in a pre-packaged form. The product has been designed to be easily mixed on-site using a slow speed drill and paddle and then applied to the substrate using a brush, roller, trowel or by spray application. Nitocote CM210, available in grey and white, cures to form a waterproof coating.

Fosroc Nitocote CM210 provides a waterproof coating suitable for use in water tanks, reservoirs, canals and culverts. The material can be used on concrete, brick and blockwork substrates. Suitable for application to below ground retaining wall and foundation structures including construction joints to maintain waterproofing continuity as part of a waterproofing solution conforming to BS8102:2022.

• No primer required
• Suitable for light foot traffic prior to installation of protective finishes
• Withstands high positive and negative hydrostatic pressures
• Excellent bond to concrete and masonry
• Long working time for ease of application
• Easy application by brush, roller, trowel or spray
• Can be applied to green or damp concrete
• Effective barrier to sulfates and chlorides

Fosroc Nitocote CM210 complies with EN1504-2: Surface protection systems method 1.3 (Ingress Protection), 2.2 (Moisture Control), 5.1 (Physical Resistance) & 8.2 (Increasing Resistivity). Reaches BS 6920: 2000 Effect on Water Quality. Water Regulations Advisory Scheme (WRAS) approved.

The waterproofing coating shall be Nitocote CM210, a cementitious product approved under the Water Regulations Advisory Scheme for use in contact with potable water. The cured coating shall have the capability to resist a positive water pressure of 7 bar and a negative water pressure of 3 bar when tested to DIN 1048. The product shall be applied in two 1mm thick coats (one coat white / one coat grey), to a correctly prepared substrate, in accordance with the manufacturer’s written instructions.

Application

Preparation

Any active water ingress should be stopped with a suitably approved plugging mortar, such as Fosroc Renderoc Plug. All surfaces which are to receive the coating must be free from oil, grease, wax, dirt or any other form of foreign matter that might affect adhesion. Typically, concrete surfaces can be cleaned using a high pressure water jet and detergent. Poor quality, friable, or contaminated surfaces require suitable mechanical preparation. Spalled surfaces or those containing large blow-holes and other such defects should be repaired using a Fosroc approved repair mortar or render. Care must be taken when choosing the repair mortar to ensure that it has all necessary approvals for contact with potable water if required. Contact local Fosroc office for advice on suitable materials. If the surface contains small blow-holes, typically less than 1mm wide, the coating can be applied directly on to the substrate without the need for a treatment.

Pre-wetting of substrate

Thoroughly dampen the substrate surface with water using a brush, roller or spray. High porosity substrates will require more dampening than dense substrates. Do not apply the coating when the substrate is wet, but allow the water to soak in until the substrate is just visibly damp before proceeding. Any excess water should be removed. Contact the local Fosroc office for further advice on suitable materials.

Mixing
The liquid component should be poured into a plastic or metal drum having a volume of at least 25 litres. This should be placed onto a plastic sheet to avoid contamination. The powder component is gradually added to the liquid whilst mixing with a Fosroc Mixing Paddle (MR3). or other approved spiral paddle attachment on a variable speed drill. Mixing is continued, constantly moving the paddle around the drum, until a lump-free slurry is obtained. This should take a minimum of 3 minutes and a maximum of 5 minutes. Note: The preferred drill speed is between 250 and 750 rpm.

Application

For optimum use of the product, Fosroc Nitocote CM210 white should be applied as the first coat, with Fosroc Nitocote CM210 grey as the second coat. This gives a visual indication of coverage. The first coat should be applied at a wet film thickness of 1mm (coverage per coat is 1.8kg/m2 or 1 litre/m2). To ensure the correct thickness is achieved, measure out an area (for example 200m2), then calculate how much material will be needed to cover this area. Monitor the coating thickness during application at regular intervals using a wet film gauge. Care must be taken to fill all imperfections such as blow-holes during application. Blow-holes can be filled while the coating is still fluid by using a dry sponge.

All the mixed material should be used within 1 hour of mixing. Allow first coat to cure for a minimum of 4 hours at 20°C/50% RH and longer at lower temperatures or higher humidities. The exact drying time will depend on surface temperature, relative humidity and air movement. High temperatures and/ or low humidity will reduce the drying time. This can vary from 1 to 16 hours. The maximum ambient temperature for application is 40°C.