Flooring Levelers & Patches - Sika® Level-425

Dust reduced, cementitious, self-leveling underlayment

Sika® Level-425 is a one-component, durable and versatile cementitious underlayment for interior concrete and cementitious substrates. It can be applied manually or by pump to produce a self-smoothing, rapid-setting, and flat substrate prior to the application of a final floor finish. Typical application thickness is 1/16” to 2” (1.5 to 50.8 mm).

• Highly fluid self-leveling
• Levels new and renovates old floors
• Interior only
• Manual or pumpable applications
• Excellent underlay for all type of residential and commercial flooring
• Compatible with subfloor heating systems
• Superior workability for easy installations
• Dust reduced
• Extended working time
• High strength
• Very low shrinkage
• Smooth finish ready for floor covering
• Can accept caster wheel loading if the thickness is greater than 1/8’’ (3.2 mm)

Usage

• Concrete
• Cement substrates
• Rapid drying cement screed systems
• OSB/Plywood only suitable for flexible coverings
• Ceramic tiles, terrazzo or natural stones

Advantages

• Highly fluid self-leveling
• Levels new and renovates old floors
• Interior only
• Manual or pumpable applications
• Excellent underlay for all type of residential and commercial flooring
• Compatible with subfloor heating systems
• Superior workability for easy installations
• Dust reduced
• Extended working time
• High strength
• Very low shrinkage
• Smooth finish ready for floor covering
• Can accept caster wheel loading if the thickness is greater than 1/8’’ (3.2 mm)

Packaging

55 lb (24.9 kg) bag

Color

Gray powder

Product Details

Product Information

Cement-based, polymer-modified binder system and fillers

12 months from date of production if stored properly in original, unopened and undamaged sealed packaging

Store dry at 41-86 °F (5-30 °C)

Protect from moisture. If damp, discard material

Application

Application Information

6.5-7 qts (6.2- 6.6 L)

65-75 °F (18-24 °C)

41-86 °F (5-30 °C)

Note: When using water based adhesives on the finished product the best results will be achieved at ambient and substrate temperatures between 59 and 77 °F (15-25 °C).

< 75 %

Note: The substrate and uncured product applied on the floor, must be at least 5 °F above dew point to reduce the risk of condensation, blooming or cement laitance forming on the surface.

41-86 °F (5-30 °C)

~ 30 minutes

As the temperature will affect the pot life, application temperature:

• Above 73 °F (23 °C) will reduce the pot life and the working time.

• Below 73 °F (23 °C) will extend the pot life and the working time.

~ 30 minutes

Consumption

30 ft² at 1/4” (2.78 m² at 6 mm) per bag

(Coverage figures do not include allowance for surface profile and porosity or material waste)

Application Steps

All substrate must be dry, stable, sound and free of all contaminants such as grease, oil, paint, wax, dust, curing and sealing compounds that will interfere with the penetration the primer and the adhesion of Sika® Level-425.

• Pour 6.5-7 qts (6.2-6.6 L) of cool potable water (~ 70 °F, 21.1 °C) into a suitably sized and clean mixing container, using a calibrated measuring jug, or similar, to ensure strict control of the water content (do not over-water). If available water is not at this temperature, then consideration should be given to cooling/heating the water.
• Add Sika® Level-425 to the water, while slowly mixing, adding the complete contents of the bag.
• Mix with a high-speed drill (> 650 rpm) and an egg beater style mixing paddle to blend water and powder for approximately 3 minutes, until a lump-free and uniform mix has been produced.
• Do not overmix or allow the paddle to rise above the level of material as this will introduce and entrap air into the mix, potentially shortening the working life or causing pin-holing in the underlayment.
• Let the mixed material stand until the majority of air bubbles have dispersed.

• Pour the mix and spread using a smoothing trowel. Even surfaces are easily achieved using a pin leveler.
• It’s not recommended to remove troweling defects or to level more than once.
• If a second layer of leveling compound has to be applied, prime the first layer with Sika^® Level-01 Primer Plus (1:1) when the first layer is walkable. The maximum layer thickness must not be exceeded in case of two layer applications and the second layer must not exceed the layer thickness of the first layer.

• Protect curing Sika® Level-425 layers from high ambient temperatures, direct sunlight and ensure an adequate air circulation.
• Sika® Level-425 does not provide an aesthetic finish and is not intended to be use as a wear layer even if coated or sealed. Sika® Level-425 must be protected from any type of contamination by installing a suitable floor covering like ceramic tiles, carpet, VCT, wood floor, etc.
• Always install an adequate number of properly located test areas, to include the finish flooring.
• As floor coverings vary, always contact and rely upon the floor covering manufacturer for specific directions such as maximum allowable moisture content, adhesive selection, and intended end use of the product.

• Clean all tools and application equipment with water immediately after use.
• Hardened / cured material can only be removed mechanically.

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