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White cementitious flexible waterproofer for roofs and vertical surfaces





(Measurement conditions 20°C και 50% R.H.).


Component Α

Component B


Cementitious powder

Condenced acrylic styrene
Flexible membrane after application




Bulk density of dry mortar





Mixing ratio

11.2 kg

4.8kg acrylic resin

Application temperature

From +5 °C to +35 °C

Temperature resistance

From -20 °C to +75 °C

Mixing time

3-4 minimum

Pot life

3 hours

Foot traffic

After 3 hours


After 72 hours

Tile installation

After 48 hours



Water tightness

To water pressure up to  7atm (kg/cm²), per DIN 1048

Resistance to UV radiation



Permiability SD to CO2 per EN 1062-6

SD > 125m

Water vapor permeability SD per ΕΝ ΙSO 7783-2

SD < 0.35m [ class Ι, (water vapor permeable)]

Capillary water absorption w per ΕΝ 1062-3

w < 0.02 kg/m2.h 0,5

Adhesion to concrete, per ΕΝ 1542:

> 2.35 N/mm²


Two component flexible and brushable, cementitious, waterproofing white mortar. It is suitable for long lasting waterproofing of flat roofs and balconies, walls, concrete as well as cement blocks and bricks. After its cure, it is resistant to standing water and frost. It allows for the transpiration of the applied surfaces. Its special composition ensures excellent resistance to the deteriorating effect of UV radiation. Classified as product for surface protection of concrete surfaces (c) per EN 1504-2.


TWO COMPONENT HYDROSTOP is mainly used for waterproofing flat roofs, on properly prepared surfaces. Apply it in 3 layers of 1mm thickness each one, granting a 15 year warranty. It is also used as a substrate, even on surfaces with hairline cracks, to be lined with clay roofing tiles. As a coating, it seals surfaces made of cement blocks and bricks, aircrete as well as outdoor plastered wall surfaces, etc. It is superb for protecting and sealing north facing walls, when applied in two consecutive, crosswise coats. It is also suitable for waterproofing basements externally, before their backfill. However, it is necessary to protect the waterproofing coating by covering it with dimple membrane throughout the waterproofed surface. The product can also be applied indoors, to seal the basement walls. Before the application, remove the, affected by moisture, plaster from part or the entire basement wall surface. Coat the perimeter surfaces, 15-30cm high from the ground up, to seal them and prevent rising damp caused from the bouncing rain.


1. Surface preparation
On non-sealed flat roofs, remove possible loose materials and dust, using a stiff broom and plenty of water.  Cracks of 0.5-1mm width are primed, using the acrylic micromolar stabilizer, AQUAFIX. Once dry, seal the cracks using TWO COMPONENT HYDROSTOP. Sections with cracks of 1-3mm width are primed with the polyurethane sealant primer, PRIMER-PU, and they are then sealed using DUROSTICK DUROFLEX-PU. Cracks wider than 3mm are sealed using the injecting epoxy resin DUROSTICK D-33. It is however advisable that cracks larger than 3mm wide should be inspected by an engineer or another qualified professional. When dealing with flat roofs subjected to heavy loads and mechanical stresses, or terrace surfaces over 60m2, it is recommended to encase within  the first, still fresh, layer of TWO COMPONENT HYDROSTOP, the alkali resistant fiberglass mesh DUROSTICK
DS-490 (mesh opening: 4x4mm, weight: 90gr/m2). Follow by applying two more crosswise layers of TWO COMPONENT HYDROSTOP.
In this way, an ideal waterproofing is achieved, lasting for at least 15 years.

2. Existing surface preparation
• When the surface has been coated previously with a torch-down waterproofing system, remove it using a wide roofing scraper and a roofing torch simultaneously.
• Worn-out or detached elastomeric sealants, are removed using a roofing scraper or any mechanical means.
• Detached elastomeric material, that are not visible, using a garden hose, pour water on the roof surface from about 1 meter high. Notice the change of the sound the water makes when it hits the detached parts of the waterproofing and mark them. Cut the detached sections using a razor blade and scrape the defective material off.

3. Application: Pour the acrylic resin (B’ component) in a clean container and slowly add the cementitious mortar (A’ component), while constantly mixing with a low rpm electric mixer, equipped with the appropriate attachment (recommended). The mixture remains workable for 3 hours, time enough to apply the entire quantity. TWO COMPONENT HYDROSTOP is applied on well soaked surfaces. Apply using an emulsion brush or roller. Apply three crosswise coats, 1mm thick each one. Each coat is applied within 2.5-3 hours (as soon as the previous coat is walkable). Re-soak the surface, if more time passes and the product has dried out. Do not apply in temperatures below +5°C or when the area weather forecast shows rain for the next 6 hours, after the application. When applying during the warm months, it is recommended to protect the application area from premature dehydration, by soaking the surface every 12 hours for the next 24 hours.



1.0-1.3kg/m²/mm of layer thickness.



Store in dry and shaded places, protected from frost, for a minimum of 18 months after  production date. 


Component Α: Contains Portland cement. Before using, refer to the cautions on the product's package or in the Material Safety Data Sheet.
Component Β: This product, based on current European and National legislation, does not require any hazardous material label. It is however recommended to keep away from the reach of children. If swallowed, seek medical advice immediately and show the container or label.



After curing, the product is harmless to health.



Container of 16kg (2x5.6kg mortar + 1x4.8kg resin) on a 48 pcs. pallet