Sikalastic®-1K
Sikalastic®-1K is a one-component, crack-bridging, fibre-reinforced mortar, based on cement modified with special alkali-resistant polymers. Sikalastic®-1K is suitable for application by brush, spray or trowel.
- One-component product, only water needs to be added
- Adjustable consistency, easy to apply by brush or trowel
- Good sag resistance and easy to apply, even on vertical surfaces
- Good crack-bridging ability
- Very good adhesion on many substrates including concrete, cement mortars, stone, masonry
- Can be applied on damp substrates
Usage
- Flexible waterproofing and protection of concrete structures including tanks, basins, pipes etc.
- Waterproofing of bathrooms, showers, terraces, balconies, swimming pools before the application of ceramic tiles bonded with adhesives
- Waterproofing of external wall surfaces to be backfilled in ground
- Inside waterproofing of negative water pressure of walls and floors in basements
- Flexible protection coating for reinforced concrete structures against the effects of freeze-thaw and carbon dioxide attack to improve durability
Advantages
- One-component product, only water needs to be added
- Adjustable consistency, easy to apply by brush or trowel
- Good sag resistance and easy to apply, even on vertical surfaces
- Good crack-bridging ability
- Very good adhesion on many substrates including concrete, cement mortars, stone, masonry
- Can be applied on damp substrates
Packaging
20 kg bags
Colour
Light grey
Product Details
APPROVALS / CERTIFICATES
- AS/NZS 4020: 2005- Products for use in contact with drinking water
- AS 4654.1: 2012- Waterproofing membranes for external above-ground materials
- CE-marking and Declaration of Performance as liquid-applied water impermeable product, based on polymer modified cementitious mortars for all external installations and swimming pools beneath ceramic tiling CMO1P according to EN 14891:2012 / AC:2012, based on assessment by notified laboratory and factory production control.
- CE-marking and Declaration of Performance as surface protection product for concrete - coating for ingress protection, moisture control and increasing resistivity according to EN 1504-2:2004, based on certificate of factory production control issued by notified factory production control certification body and type testing.
Composition
Cement modified with alkali resistant polymers, selected aggregates, fine fillers admixtures, additives and fibres.
Shelf life
6 months from date of production
Storage conditions
Store properly in the original packaging, in cool and dry conditions. Protect from water.
Maximum grain size
Dmax: ~0,3 mm
Crack bridging ability
| > 0,50 mm (Class A 3, +23 °C) 1 | (EN 1062-7) |
| ≥ 0,75 mm (+23 °C) 2 | (EN 14891 A.8.2) |
| ≥ 0,75 mm (–5 °C) 2 | (EN 14891 A.8.3) |
1 Value obtained with a total layer thickness of 3 mm in two layers with 22 % water
2 Value obtained with a total consumption of 3.6 kg/m2 in two layers with 30 % water
Tensile adhesion strength
| ≥ 0,8 N/mm2 | (EN 1542) |
Value obtained with a total layer thickness of 3 mm in two layers with 22 % water
| Test method | Requirement | |
| Initial tensile adhesion strength | A.6.2 | ≥ 0,5 N/mm2 |
| Tensile adhesion strength after water contact | A.6.3 | ≥ 0,5 N/mm2 |
| Tensile adhesion strength after heat aging | A.6.5 | ≥ 0,5 N/mm2 |
| Tensile adhesion strength after freeze-thaw cycles | A.6.6 | ≥ 0,5 N/mm2 |
| Tensile adhesion strength after contact with lime water | A.6.9 | ≥ 0,5 N/mm2 |
| Tensile adhesion strength after contact with chlorinated water | A.6.7 | ≥ 0,5 N/mm2 |
Values obtained with a total consumption of 3.6 kg/m2 in two layers with 30 % water
Capillary absorption
| ~0,02 kg/m2∙h0.5 | (EN 1062-3) |
Value obtained with a total layer thickness of 3 mm in two layers with 22 % water
Water penetration under pressure
| No penetration after 72h at 5.0 bar 1 | (EN 12390-8)2 |
| No penetration after 7 days at 1.5 bar 3 | (EN 14891 A.7) |
1 Value obtained with a total layer thickness of 3 mm in two layers with 22 % water
2 modified
3 Value obtained with a total consumption of 3.6 kg/m2 in two layers with 30 % water
Water penetration under negative pressure
| no penetration after 72h at 2.5 bar | (UNI 8298/8) |
Value obtained with a total layer thickness of 3 mm in two layers with 22% water
Permeability to water vapour
| Class I (permeable) | SD < 5 m |
Value obtained with a total layer thickness of 3 mm in two layers with 22 % water
Permeability to carbon dioxide
| SD ≥ 50 m | (EN 1062-6) |
Value obtained with a total layer thickness of 3 mm in two layers with 22 % water
Freeze thaw de-icing salt resistance
| ≥ 0.8 N/mm2 | (EN 13687-1) |
Value obtained with a total layer thickness of 3 mm in two layers with 22 % water
Reaction to fire
| Euroclass A2 | (EN 13501-1) |
Application
Mixing ratio
| Application Method | Water dosage |
| By brush | ~6,0 litres water per 20 kg bag |
| By trowel | ~4,4 litres water per 20 kg bag |
Fresh mortar density
~1,5 kg/l
Layer thickness
For standard applications a total 2mm DFT, applied in minimum 2 layers.
For negative pressure/immersed appications a total 3-4mm DFT, applied in minimum 2 layers.
Maximum recommended thickness per layer is 2 mm when applied by trowel and 1 mm when applied by brush
Ambient air temperature
5 °C min. / 35 °C max.
Substrate temperature
5 °C min. / 35 °C max.
Pot Life
~30 min at +20 °C
Waiting time to overcoating
Sikalastic®-1K must be completely hardened before over-coating or water contact.
Guide for waiting times at the following temperatures:
| +20 °C | +10 °C | |
Horizontal coving by tiles | ~2 days | ~7 days |
Vertical covering by tiles | ~2 days | ~3 days |
Water emulsion coating | ~2 days | ~3 days |
| Immersion in water | ~2 days | ~7 days |
| Contact with drinkable water | ~15 days | ~15 days |
Times will vary due to ambient and substrate humidity.
Consumption
This depends on the substrate roughness; as a guide: ~1,2 kg/m2/mm
MIXING
Sikalastic®-1K can be mixed with a low speed (~ 500 r/min) hand drill mixer, adding the right quantity of water according to the respective application. Once a homogeneous mix is obtained, continue mixing for 3–4 min. The mortar must be homogeneous and lump free. Do not add any additional water or other ingredients. Each bag must be entirely mixed, to avoid faulty particle size distribution of aggregates contained in the powder component.
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 or anywhere else in the structure must also be sealed and made watertight.
Use coved details at the floor/wall junctions.
Apply Sikalastic®-1K by:
- spatula/roller: Exerting good and even pressure onto the substrate;
- brush: In 2 directions (diagonally opposite / cross-wise);
- mechanical spray: Refer to Sika Technical Service for details
The optimum waterproofing performance is obtained by applying Sikalastic®-1K by trowel in at least 2 layers, to a total thickness of at least 3 mm.
Application by brush 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 (subsequent layers must be applied crosswise).
Wait until the first layer is dry before applying subsequent layers.
The application shall cover the whole surface of the substrate in a uniform thickness.
Sikalastic®-1K cannot be smoothed using float or sponge trowel. It is possible to smooth the surface as soon as the curing of the product is complete by light abrasion techniques.
JOINTS
At joints or other critical movement areas (for example junctions with vertical surfaces), the waterproofing may 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. Please Note Sika® Seal Tape S is not suitable for swimming pools; for immersed and tanking applications the Sikadur Combiflex® SG System is recommended, contact Sika Technical Services for additional information.
TILING
Ceramic and vitreous tiles may be installed on Sikalastic ®-1K using a polymer modified cement based tile adhesive in the Sika® range. All joints and gaps must be sealed.
CLEANING OF EQUIPMENT
Tools should be thoroughly cleaned with water before the material has set. Hardened mortar can only be removed mechanically.