Cementitious Waterproofing

Monneli Cemcoat

Single Component Flexible Waterproofing Slurry

CEMCOAT is used for internal and external waterproofing of concrete and masonry supports against humidity, running water, stagnant water etc.
It can be applied to waterproof structures such as:
Swimming pools
Reservoirs and plants
Dams and foundation walls
Floors and walls of wet areas
Prefabricated systems
Canals and concrete pipes
Water tanks and harbours
Galleries and humid rooms
Elevator and shafts
Basements and tunnels,
Inspection pits and retaining walls
Lift shafts
Bridge decks
It can be used as a water vapor barrier over concrete substrates or over plasters, cement screeds, dry screeds made of cementitious fiber boards, aerated concrete slabs in single coat application.
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Technical Information
Product Description

CEMCOAT is a flexible, hydraulically setting, Sulphate resistant waterproofing slurry that can be applied as a crack-bridging waterproofing coating for indoor and outdoor areas of buildings. CEMCOAT as a single component dry mix mortar can be mixed on site with water to form a ready-to-use waterproofing slurry.

  • Rapid and easy application
  • Shrink-free and crack-free
  • Excellent substrate bonding
  • Impermeable even to water under pressure
  • Water vapor barrier for cementitious substrates
  • Resistant to frost and aging
  • Sulphate resistant
  • Can also be covered with all types of tiles when using latex modified cement based tile adhesive
  • Can be used in contact with water for human consumption
  • Single component, No additional latex is required
Packaging, Coverage / Consumption


CEMCOAT is supplied in paper bags of 20 kg.



1.7 kg/m² for 1 mm thickness.

Shelf Life & Storage


CEMCOAT should be stored under cover away from extreme heat or direct sunlight or frost.


Shelf life:

12 months if stored properly.

Light blue, cement grey, white
Technical Properties
Appearance Cementitious powder
Colour  Light blue, cement grey, white 
Mix density  1.7 kg/L 
VOC 0.8 g/L
Shore D hardness 30
Vapor permeability (ASTM E96) 5 Perms
Tensile adhesion strength (BS EN 14891) > 2 N/mm²
Crack bridging >0.75mm
Resistance to hydrostatic pressure at 1.5 bar (BS EN 14891) Passed
Potable water suitability (BS 6920) Passed
Workability >30 min
Application temperature +5ºC to +35ºC
Open to water exposure after 7 days
Can be covered (plaster, tiles, etc.) after 24 hours
All values are subject to 5-10% tolerance
Application Information
Instructions for use

Surface Preparation

The surface of the concrete shall be sound, clean and uncontaminated. This preparation shall be such as to leave a sound exposed concrete surface free from dust, loose particles and any deleterious matter. If the concrete surface is defective or has laitance, it must be cut back to a sound base.

Moss and lichen must be removed physically followed by treatment with fungicidal wash. After treatment, it must be washed down thoroughly with clean water.

In addition, make sure that all surfaces must be damp but not totally wet before progressing the work.

Crack treatment

Shrinkages and non-moving structural cracks less than 0.3mm shall be filled with a pre-treatment strip of CEMCOAT directly bridging over the crack.

Static cracks that are greater than 0.3mm shall be repaired by chiseling the crack into a V-shape, to a depth and width of 25mm and priming it with PRIMER A18 followed by the application of Colmef cementitious repair material.

Voids and honeycombs shall be patched with BETOFINISH C, a single component polymer modified fairing coat, allowing the area to cure before applying the membrane.

Right angle bends

All right angle bends must have a coving detail installed. In areas where parapet walls, columns, pipe penetrations are present, a 45° coving fillet shall be made at all corners using BETOCEM FIBER, a Fiber reinforced shrinkage controlled mortar for concrete repair to the water saturated cured surface.

All other angles, joints, protrusions and stress joints should be pre-treated with a heavy application of CEMCOAT.

Movement Joints

Expansion and movement joints should be sealed with ELASTOSEAL PU, a Polyurethane sealant. Allow to cure before the application of CEMCOAT.


Highly porous concrete or concrete containing microsilica will require priming with PRIMER A18, from Colmef, a synthetic, high penetrating primer.

The primer shall be applied at a rate of 5-6 m²/L and left to achieve a tack-free condition before applying the top coat. A second coat of primer may be required if the substrate is excessively porous.


Mix 20 kg of CEMCOAT (1 bag) with approximately 6.0 to 6.5 liters water. Mix until a uniform, lump-free and slurry grade mortar is obtained. The mixture should not contain any residue of dry powder. For best results an electric drill mixer (approximately 400rpm) with attached stirrer should be used. Let the mixture rest for about 5 minutes, and remix again shortly before application.


CEMCOAT can be applied with a roller, brush or with a spraying machine. For specified method application, contact Colmef Technical Department.

For positive pressure waterproofing in application such as waterproofing in swimming pools, reservoirs, foundations, basements from outside, etc, the waterproofing is carried out with at least 2 fullsurface applications (3 applications in the case of water under pressure).

The first coat of CEMCOAT must always be applied by brush. It must be applied intensively to provide saturation coverage and a closed surface (consumption approx. 1.7 kg/m² for 1 mm thickness).

The second coat can be applied minimum after 6 – 8 hours at +25ºC. The consumption should not exceed 1.7 kg/m² per coat to guarantee crack free drying of the waterproofing layer. Do not apply CEMCOAT to frozen substrates, in frost or at high temperatures (substrates temperature should be less than +35ºC).

On substrates that are exposed to movements and deformation or where cracks are expected, reinforcing glass fibre mesh shall be spread into the first coat of CEMCOAT before applying adhesives. Tiling or finished floor installations should be carried out as soon as possible after full cure of membrane is established.

Curing and Protection

Surfaces treated with CEMCOAT must be kept damp and must be protected from the drying action of direct sunlight for a minimum period of 3 days after application.

Protect all treated surfaces from wind and frost, by covering with plastic sheeting, damp hessian or equivalent.

All tools should be cleaned with water Cured material can only be removed mechanically.


  • During windy or sunny days, spray water onto the surface to avoid the rapid evaporation of water
  • Do not apply at a temperature below +5ºC.
  • Do not use on substrates with possible moving cracks
  • Do not apply higher thickness to avoid possible cracks appearance.
  • For application in drinking water tanks, wash the applied coat thoroughly with plenty of water, scrubbing the surface with sponge before using the tank.
Additional Information
Health & Safety

While CEMCOAT is non-toxic, skin and eye contact should be avoided.

Use gloves, protective creams and goggles to avoid the contact with eyes and skin.

In case of skin contact clean immediately with a resin removing cream, followed by soap and water. In case of contact with eyes, use clean water to wash the eyes and seek doctor medical attention immediately.

Important note

The information in this Technical Data Sheet is based on Colmef Monneli’s experience. Colmef Monneli does not accept any liability arising from the use of its products as it has no direct or continuous control over where or how its products are applied. All Colmef Monneli’s Data Sheets are updates on regular basis. It is the user’s responsibility to obtain the latest version.

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