damp proofing plaster


Product description

Specialist, mineral plaster based on a hydraulic binder for execution of barrier plasters on damp and saline substrates of brick, natural stone and concrete surfaces.

Main properties

    Main parameters

    • forms watertight coat blocking the capillary rising of humidity
    • vapour permeable
    • consumption: ca. 1.7 – 1.8 kg/ 1 m²/ 1 mm


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    ·          specialist, mineral plaster based on a hydraulic binder

    ·          for execution of barrier plasters on damp and saline substrates of brick, natural stone and concrete surfaces

    ·          forms watertight coat blocking the capillary rising of humidity and its transfer indoors

    ·          recommended for heritage sites, foundations, basement walls and building plinth zones in places where walls adjoin the ground directly

    ·          particularly useful when the reconstruction of vertical wall insulation is difficult or impossible due to technical or organizational reasons (walls adjoining terraces, frontage line buildings, etc.)

    ·          can be used in contemporary construction, for execution of plasters on plinths, retaining walls and fencing, particularly at floodplains or areas at risk of flood

    ·           protects the walls construction material against splash water

    ·          forms coat resistant to water pressure of 0.2 bars

    ·          vapour permeable – allows free humidity evaporation and substrate drying

    ·          resistant to sulfates – does not require wall salts content evaluation, ensures proper adhesion to damp and saline surfaces

    ·          high mechanical strength


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    ·          indoors and outdoors in case of lack of or faulty horizontal and/or vertical insulation

    ·          as an alternative solution for tub-shaped insulation with the use of one-component, mineral waterproofing mortars and renovation plasters

    ·          partly earth – sheltered, external, foundation or basement walls - it is recommended to execute the insulation membrane made of SILICIFICATION PREPARATION KS above the ground level, from indoors or outdoors

    ·          fully earth – sheltered foundation and basement walls or those forming partitions adjoining neighboring buildings or other rooms - it is recommended to execute the insulation membrane made of SILICIFICATION PREPARATION KS at floor level as well as in the zone just below the room ceiling

    ·          on external walls, in the plinth zone, on retaining walls and fencing, for execution of wall protective coat against rainwater and splash water action

    ·          damp proofing plasters, due to their action characteristics, should not be used beyond the ground floors and foundation walls as well as in case of pressure water action


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    The method of substrate preparation should be individually adjusted for each object, depending on the strength and condition of the substrate material and its historic value. Plasters/renders of low strength, poorly adhering or loosening should be removed, carve out the masonry mortar from joints up to depth of 20 mm. Then, clean the exposed surface from dust, efflorescence, mortar remains and poorly adhering wall elements. Fill the cleaned joints and wall defects with MORTAR FOR FILLING CAVITIES IN BRICK AND NATURAL STONE CG. Visible saline efflorescence should be mechanically removed by cleaning, PREPARATION FOR SALT NEUTRALISATION PS can be used, if needed. It is also necessary to remove any biological contamination. To do that, the contaminated sites should be cleaned of visible deposits with a brush or a pressure washer, then use the BIOCIDAL PREPARATION PB. The preparation should be applied at least three times in order to neutralize the contamination in different development stages. If needed, use SILICATE STREGTHENING PREPARATION KPW on the whole surface before plastering in order to strengthen the substrate. After full substrate preparation, in case of concrete substrates or small – sized lime – sand elements plastering, it is advisable to apply the scratch coat made of SCRATCH COAT TRO.



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    Prepare the mortar by pouring the dry mix into a container with a suitable amount of water and mixing mechanically until homogenous, free from lumps and separating liquid. Recommended proportions are 5.00 liters of water to 25 kg of the dry mix. The mortar can be used within ca. 60 minutes, it should be re-mixed from time to time. Apply the plaster in an even layer, manually, by throwing with a trowel, upon the appropriately prepared substrate. It is recommended to apply the plaster in coats ca. 10 mm thick, depending on the substrate dampness level. For walls slightly damp, one – two plaster coats are sufficient, for walls intensively damp it is advisable to use minimum three plaster coats. It is recommended to execute a plaster cove made of DAMP PROOFING PLASTER HYDROTYNK U, onto wall corners and wall – floor joint edges. When applying the plaster outdoors, after execution of each intermediate coat, it is advisable to float its surface rough. The final coat can be slightly floated, but without surface felting. While applied plaster is drying, provide appropriate ventilation of the rooms indoors. Protect plasters applied outdoors from drying too fast, wet them with water within 5 up to 7 days from application, if needed.


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    ·          The above information constitutes basic guidelines for the application of the product and does not release the user from the obligation of carrying out works according to engineering principles and OHS regulations.

    ·          The tools must be cleaned with clean water directly after use.

    ·          The shelf life of the product is 12 months from the production date shown on the packaging. The mortar must be transported and stored in tightly sealed bags, in dry conditions.

    ·          Irritant – contains cement. Risk of serious damage to the eyes. May cause sensitisation by skin contact. Keep out of the reach of children. Do not breathe dust. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. Wear suitable protective clothing, gloves and eye/face protection. If swallowed, seek medical advice immediately and show the container or label.

    ·          Detailed information on hazards and safe use conditions, ecological aspects and recommendations for transport and storage are listed in the Material Safety Data Sheet.


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    DAMP PROOFING PLASTER HYDROTYNK U is a factory made dry mix manufactured on the basis of the hydraulic binder, quartz fillers and additives providing water tightness and waterproofness.

    Mixing proportions: water/dry mix
    5.0 l/25 kg
    Pot life
    ca. 1 hour

    ca. 1.7 – 1.8 kg for 1 m² with 1 mm layer thickness

    Minimum coat thickness
    10 mm
    Maximum coat thickness
    30 mm (up to 50 mm at points)
    Mortar preparation temperature,

    substrate and ambient temperature during work

    from +5°C to +25°C
    Available packaging

    paper bags of 25 kg

    Content of soluble chromium (VI) in ready-to-use mix

    ≤ 0.0002%


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    CE 14

    Declaration of Performance no. AZW HTU/CPR

    PN-EN 998-1:2012 (EN 998-1:2010)

    Factory made plastering mortar of specified properties, general-purpose (GP), for manual application.

    For indoor and outdoor use,  for walls, ceilings, posts and partition walls.
    Reaction to fire - class

    Water absorption - category

    Adhesion, FP:B
    ≥ 0.3 N/mm²

    Water vapour permeability coefficient

    (tabular value), μ

    (EN 1745:2002, table A.12)
    Thermal conductivity coefficient
    (average tabular value P=50%)
    0.83 W/mK (λ10, dry)

    (EN 1745:2002, table A.12)

    Durability. Compressive strength

    decrease after 25 freeze-thaw cycles

    ≤ 15 %

    Durability. Mass decrement

    after 25 freeze-thaw cycles

    ≤ 3%
    Gross dry mortar density
    ≤ 1800 kg/m³

    Release/content of hazardous substances

    See: Material Data Sheet
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    damp proofing plaster

    Current documentation