Product Data Sheet Show all documents
Sikalastic®-1K GB

Sikalastic®-1K GB

One-component cementitious mortar, fibre-reinforced for flexible waterproofing and concrete protection

Sikalastic®-1K GB is a one-component, crack-bridging, fibre-reinforced mortar, based on cement modified with special alkali-resistant polymers. Sikalastic®-1K GB is suitable for application by brush 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
Product Data Sheet Show all documents

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

Sustainability / Certifications / Approvals

APPROVALS / STANDARDS

  • 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.
Product Information

Chemical Base

Cement modified with alkali resistant polymers, selected aggregates, fine fillers admixtures, additives and fibres.

Shelf Life

12 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

 
Technical Information

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 agingA.6.5≥ 0,5 N/mm2
Tensile adhesion strength after freeze-thaw cyclesA.6.6≥ 0,5 N/mm2
Tensile adhesion strength after contact with lime waterA.6.9≥ 0,5 N/mm2
Tensile adhesion strength after contact with chlorinated waterA.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

(EN ISO 7783-1)

Value obtained with a total layer thickness of 3 mm in two layers with 22 % water

Permeability to CO2

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

≥ 1.0 N/mm2

(EN 13687-1)

Value obtained with a total layer thickness of 3 mm in two layers with 22 % water

Application

Application Information

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

3 mm with constant thickness, 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 / Overcoating

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

Guide for waiting times at the following temperatures:

+20 °C

+10 °C

Horizontal covering 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

Consumption

This depends on the substrate roughness; as a guide: ~1,2 kg/m2/mm
Application steps

MIXING

Sikalastic®-1K GB 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 GB by:

  • spatula/roller: Exerting good and even pressure onto the substrate;
  • brush: In 2 directions (diagonally opposite / crosswise);
  • mechanical spray: Refer to Sika Technical Service for details
 

The optimum waterproofing performance is obtained by applying Sikalastic®-1K GB 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 GB 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.

CLEANING OF TOOLS

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

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