Osmotic plastic-deformable two-component waterproofing cement

Code: OSM.0349

Components: 2

Appearance: Liquid + Powder

A two-component osmotic cementitious waterproofing in water dispersion, being a modified polymer that is super adhesive and flexible, resistant to positive and negative thrusts. Application by trowel, brush or roller. Ideal for protective coatings and waterproofing of reinforced concrete and masonry works such as tanks, swimming pools, water pipes, cracked cement plasters or balconies. It is also used for repairs and protective coatings of structures offshore or exposed to sea salt. Suitable for contact with drinking water.

Linee di appartenenza

Certification obtained and Standards

Products and systems for the protection and repair of concrete structures - Surface protection systems for concrete

EN 1504-2

Products and systems for the protection and repair of concrete structures - Surface protection systems for concrete

General characteristics


Pot-life: 50-70 min


Temperature of use: +5 / +35 °C


Maximum diameter of aggregate: < 0.4 mm


Shelf-life: 12 months


To be applied in two coats


Min. recommended thickness: 1.5 mm


Highlighted product

Technical specifications

Permeability to CO2

Sd 93 m

Compressive strength at 02 days

2.5 N/mm²


1600 g/l

Mixing ratio of the components

3.12:1 _

Coefficient of permeability

< 5 mm

Thermal compatibility after cooling shocks - storm cycles

1.8 N/mm²

Determination of adhesion for direct traction (Fh)

2.2 N/mm²

Compressive strength after 28 days

> 9.0 N/mm²

Capillary absorption

0.027 kg•h^0.5/m²

Longitudinal elongation at break

15 %

Exposure to artificial weathering-2000 hours

no swelling. no cracking. no flakin _

Flexural strength at 2 days

> 1.0 N/mm²

Flexural strength after 28 days

> 3.0 N/mm²

Permeability to water vapor

Sd 0.9866 (class I) _

Available colours

- Gray

- White

Packaging and dimensions

- Bag 25 kg [A]

- Kit: 1 Bag 25 kg [A] + 1 Plastic can 8 kg [B]

- Plastic can 8 kg [B]


OSMOCEM iTOP is characterised by an extreme ease of application, being veritably fool-proof. It permits adherence to supports for mechanical adhesion and osmotic diffusion. It is also effective in conditions of negative hydrostatic thrust (counterthrust) and is applicable as a coating in rooftop gardens and planters due to its resistance to the mechanical action of roots.


Approximately 1.6 kg/m² of OSMOCEM iTOP for each millimetre of thickness to be made.

Use fields

Waterproofing treatments for underground structures and masonry, swimming pools, tubs, planters, rooftop gardens, ducts, tunnels, pits, bridges, tanks, basements, food containment areas and so on whereby sufficiently porous and absorbent, being free from any water-resistant and/or water-repellent surface treatment, be it chemical (siloxanes, epoxy, polyurethane, etcetera) or natural (waxing). Suitable for both positive and negative hydrostatic thrust conditions, it can also be used for waterproofing terraces and balconies.

Preparation of supports

The applicative surfaces must be clean, free from contamination or any loose or detached parts, dust, water-repellent treatments in general, and so on, being suitably watered down until it is “saturated with a dry surface”. It is always advisable to prime the application support with approximately 100-150 g / m2 of COMPONENT B adhesive latex; in this way, at least three extraordinarily effective operations are carried out with a simple and fast priming: a) expulsion of the air from the surface porosity _ stopper (with a drastic reduction of the well-known blistering that occurs on elastic products with low thickness); b) decrease in the absorption of the support (to guarantee a suitable curing of the waterproof skim coat); c) increased adhesion thanks to the deep penetration of the polymeric component. For applications on plasterboard apply preliminarily
a coat of Bond Plus as primer.

Use method

Mix the powder (component A) with the hydrating solution (component B) using a drill at low-speed or other effective mechanical mixer, gradually adding the powder to the liquid. Continue mixing until reaching a homogeneous and lump-free mixture.
After mixing, wait a few minutes then stir again before applying.
To further improve the effects of the coating (for example, when waterproofing terraces and balconies), it is advisable to add the ARMAGLASS 160 alkaline-resistant fibreglass reinforcing mesh between one layer and the next, for a consumption of around 3-4 kg/m2 as a guideline.
Do not apply in the presence of direct insolation or when dealing with wet curing and protection.
Do not apply to substrates with little to no porosity or those previously coated with water-repellent treatments generally, except whereby following proper roughening by means of bush hammering machines, sanders or equipment suitable for preparatory surface treatment or specific treatment with suitable polymer primers.

Application methods

- Brush

- Finishing trowel

- Paint roller

- Plastering machine

- Spatula

- Sprayer

Tool cleaning

- Water

Permitted supports

- Bricks

- Concrete

- Drywall

- Fiber-cement

- Floor screed

- Mixed walls (bricks and stones)

- Plasters

- Prefabricated concrete

- Rock walls

- Stone walls

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