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Hydrostatic Pressure resistant Liquid Membrane  :

Sikalastic -1K (au) One component cementitious mortar fibre reinforced for flexible waterproofing  

Product Description  

Sikalastic -1K is a one component, flexible, fibre-reinforced mortar, based on cement modified with special alkali-resistant polymers. It also contains fine fillers, selected graded aggregates, plus special waterproofing additives to produce a flexible mortar that is ideal for waterproofing surfaces subject to flexural strain. Sikalastic -1K is suitable for application by brush, roller, trowel or spray equipment.  


  • Protection of concrete surfaces according to EN 1504-9, principles 1: protection against penetration (coating); 2: control of moisture (coatings); and 8 increasing resistivity (coating)
  • Waterproof protection of concrete structures including tanks, basins, pipes, etc.
  • Waterproofing external wall surfaces to be backfilled in ground
  • Internal waterproofing of walls and floors, in basements
  • Waterproofing of terraces and balconies over concrete or prepared existing tiles
  • Flexible protection coating for reinforced concrete structures against the effects of de-icing salts, freeze-thaw and carbon dioxide swell consolidation.   

Characteristics / Advantages   

  • Suitable for negative pressure to 25m
  • Can be applied on damp substrates
  • Easy to apply by brush, roller, trowel or spray equipment
  • Good sag resistance and easy to apply, even on vertical surfaces
  • Good crack-bridging properties
  • Very good adhesion on many substrates including concrete, cement mortars, stone, ceramics, bricks and timber
  • Mixing ratio can be adjusted in order to obtain the consistency and workability desired for the intended application   

Approvals / Standards: AS4020:2005 - potable water  

Product Data  

Colours: light grey

Packaging: 20kg bags & 10kg pails  


Storage Conditions / Shelf-Life: 12 months from the date of production, if stored properly in the original packaging, in cool and dry conditions. Protect from water.  

Technical Data   

Chemical Base: Cement modified with polymers, selected aggregates, admixtures, additives and fibres.

Mixed Density: ~1.5 kg/l

Grading: : 0.125 mm  

Mechanical Properties   

Resistance against water pressure:

positive: 3.0 bar, EN 12390-8, with exposition time modified to 5 days

negative: 2.5 bar,  Internal test according to EN 14891:2007 and DIN 1048-5:1991 with time modified to 6 days  

Behaviour after immersion in salt water:

Adhesion to concrete after curing for 1 week at 20oC and R.H. 60% and then immersion in solution of 35g of sodium chloride for each litre of water (similar to sea water) 

  • immersion for 1 month 1.90 MPa (EN 1542)
  • immersion for 3 months 1.52 MPa (EN 1542)
  • immersion for 6 months 1.22 MPa (EN 1542)
  • immersion for 1 year 1.15 MPa (EN 1542)   

Application Details   

Consumption: ~1.2 kg/m2/mm thickness

Substrate Quality: Substrates must be structurally sound, clean, dry and free of all contaminants such as dirt, oil, grease, coatings and other surface treatments, etc.

Substrate Preparation: Clean surfaces by blast cleaning, high-pressure water-jetting (400 bar), wire-brushing, grinding and abrading of ceramic tiles etc., in order to remove all previous coatings, any traces of grease, rust, release agents, cement laitance and any other material which could reduce adhesion. All dust deposits from this preparation must also be removed i.e. by vacuum.

Repair concrete substrates, if necessary, with an appropriate cementitious mortar from Sika MonoTop range of repair materials.

The substrate must be adequately dampened before application  

Special Requirements   

All connections between the substrate and pipe entries, plant and equipment, light switches etc., must be sealed and watertight. Joints in concrete, pipes, anywhere else in the structure must also be sealed and made watertight.

Use coved details at the floor/wall junctions

Avoid any stagnant water presence or condensation / ponding on the surfaces before application.  

Application Conditions / Limitations    

  • Substrate Temperature: min. +5oC; max. +35oC
  • Ambient Temperature: min. +5oC; max. +35oC   

Application Instructions /   Water Dosage: 

  • application by roller: ~ 7 litres water per 20 kg bag
  • application by brush: ~ 6 litres water per 20 kg bag
  • application by trowel: ~ 4.4 litres water per 20 kg bag
  • Note: Product should be gradually added to water while mixing until homogenous. 

Application Method / Tools   

Apply Sikalastic -1K by:

1) spatula, exerting good and even pressure onto the substrate;   2)short-medium hair roller, maintaining a homogeneous distribution on the substrate;   3) brush, in 2 directions (diagonally opposite / cross-wise);   4) mechanical spray: refer to local Sika Technical Department for details

Maximum recommended thickness is 2 mm per coat. The final thickness when applied by trowel will depend on the method of application and level or grade of exposure / waterproofing required.

For demanding applications including negative pressure. The optimum waterproofing performance is obtained by applying Sikalastic -1K by trowel in at least 2 layers, to a total thickness of 3-4mm. For general applications 2 coats of minimum 1mm is recommended.

Application by brush or roller must be undertaken with the maximum attention to uniformly covering the whole surface. The maximum recommended thickness for these methods of application is 1 mm per layer. In these situations, the application of min. 2-3 layers is required. Wait until the first layer is dry before applying subsequent layers.

Do not blast clean or abrade before complete hardening of the material damaged. Wait for complete hardening, and then remove any roughness by light sanding.


At joints or other critical movement areas (for example junctions with vertical surfaces), the waterproofing can be reinforced by Sika Seal Tape S. It must be applied directly on the fresh first layer and then covered by the second layer of Sikalastic -1K.


Ceramic tiles and vitreous mosaics can be applied on Sikalastic -1K using a specific adhesive (e.g. cement based adhesive with maximum flexibility according to Class C2 EN 12004). Joints gaps must be sealed with specific cement based products such as found in the Sika Ceram range.  

Cleaning of Tools: Tools should be thoroughly cleaned with water before the material has set. Hardened mortar can be only be removed mechanically.  

Pot Life: ~ 30 min.@ +20oC

Sikalastic -1K must be completely hardened before over-coating or water contact.

Guide for waiting times at the following temperatures:

                                                 +20oC        +10oC


  • 1) Horizontal covering by tiles        ~2 days     ~7 days
  • 2) Vertical covering by tiles           ~2 days     ~3 days
  • 3) Water emulsion coating             ~2 days     ~3 days
  • 4) Immersion in water                  ~2 days     ~7 days
  • 5) Contact with drinkable water      ~15 days   ~15 days


Times will vary due to ambient and substrate humidity  

Notes on Application/ Limitations:

1) Sikalastic -1K cannot be smoothed using a float or trowel

2) protect from rain for at least 24-48 h after application;

3) avoid direct contact with chlorinated water i.e. in swimming pools, by using suitable protection e.g. ceramic covering;

4) avoid application in direct sun light, when rain is imminent or in strong winds;

5) Setting time can be influenced by high relative humidity, particularly in closed rooms or basements. The use of adequate ventilation is recommended;

6) Before contact with drinking water, ensure the Sikalastic -1K is completely hardened and wash carefully to remove dust, loose material or stagnant water in accordance with Italian regulation.

7) Sikalastic -1K is permeable to water vapour and does not form a vapour barrier for resin based systems not permeable to gas

8) If a solvent based paint is to be applied on Sikalastic -1K, carry out preliminary testing in order to ensure the solvents do not attack and damage the waterproofing layer.  

Health and Safety Information:

For information and advice on the safe handling, storage and disposal of chemical products, users shall refer to the most recent Safety Data Sheet containing physical, ecological, toxicological and other safety-related data   .


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