Sikalastic-1K GB – Flexible Waterproof Mortar 20kg
Product code: 489549
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Stock availability for Sikalastic-1K GB - Flexible Waterproof Mortar 20kg
Glasgow
Unit 30 Deerdykes View, Westfield, Cumbernauld, Glasgow, G68 9HN, .
Essex
The Garage Unit. The Forge, Ockendon Road, North Ockendon, , RM14 3PS, .
Caldicot
Unit 16A Norman Way, Severn Bridge Industrial Estate, Caldicot, Monmouthshire, NP26 5PT, .
Leeds
Unit 14 Gelderd Trading Estate, West Vale, Leeds, , LS12 6BD, .
- 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 back- filled 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
- 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
- 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.
- Italian Regulation D.M. 174-2004 (Drinking water)
SPC Supplies Delivery Schedule
Orders placed before midday will be dispatched for delivery the same day (except weekends and bank holidays) subject to stock availability.
Orders placed after midday will be dispatched the next working day (except weekends and bank holidays) subject to stock availability.
When you have placed your order our dispatch team will prepare your items for collection from our couriers. When the couriers have collected your items you will be emailed a tracking number.
Please note:ย Our offices and warehouses are open Monday to Friday, 8am to 5pm. We are closed on weekends and bank holidays. โWorking dayโ is Monday to Friday.
Please allow 3-5 working days for your delivery unless โNext Day Express Deliveryโ is stated.
If you have ordered a product that is listed as โNext Day Express Deliveryโ before midday on Monday to Friday your order will be processed an dispatched the same day delivered the next working day.
For example. If you order a product listed as โNext Day Express Deliveryโ on Monday before midday it will be delivered the next day (Tuesday).
If you order a product listed as โNext Day Express Deliveryโ on Friday before midday it will be delivered the next working day (Monday).
If you order a product listed as โNext Day Express Deliveryโ on Friday after midday it will be processed the next working day (Monday) and delivered the following working day (Tuesday).
Orders for UK Mainland
Any orders placed Monday to Friday before midday will be processed and dispatched the same day.
Any orders placed Monday to Friday after midday will be processed and dispatched on the next working day.
Saturday delivery is available on request only โ please call 01708 855 698 for a quote.v
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Sikalastic-1K GB FAQs
What is Sikalastic-1K GB?
Sikalastic-1K GB is a 1-part cementitious mortar, fibre-reinforced for flexible waterproofing and concrete protection.
What is the mixing ratio of Sikalastic-1K GB?
Application by brush : ~6,0 litres water per 20 kg bag
Application by Trowel : ~4,4 litres water per 20 kg bag
How do I mix Sikalastic-1K GB?
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 3โ4 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.
How do I apply Sikalastic-1K GB?
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. 2โ3 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.






