Sika® Level 425


Stock#: ____ | UPC#: ______

Sold by the Bag | Online Sale Only

  • Highly Fluid Self-Leveling
  • Levels New and Renovates Old Floors
  • Interior Only
SKU: Sika-Level-425 Category: Tags: , ,


Sika® Level 425

Sika® Level 425 Level is 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)..

Product Description
  • Manufacture: Sika
  • Style: Floor Prep Material
  • Model: Level 425
  • SKU: _______

Detailed Specifications
  • Series Name: Level
  • Type: Patch Underlayment
  • Unit of Measure Quantity: 55
  • Unit of Measure : Pounds(s)
  • Application: Patch
  • Dry Color: Gray
  • Primer Required:
  • Use Location: Indoor Only
  • For Use on Ridges:
  • For Use on Gouges:
  • For Use on Depressions:
  • For Use on Seams:
  • Package Quantity:1
Documentation | PDF Downloads
  • Sold As: Bag
  • Weight Per Bag: 55 Pound(s)
  • Bags Per Pallet: 50

  • Country of Origin: United States
  • Shipping: We ship to all of the Lower 48 with UPS Ground or LTL Freight Solutions
  • Monitor Color: Colors will vary depending on the type of monitor, resolution, and calibration.
  • Returns Policy: NO REFUNDS. NO RETURNS.



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


  • 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)

Product Information

Chemical Base

Cement-based, polymer-modified binder system and fillers

Shelf Life

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

Storage Conditions

Store dry at 41–86 °F (5–30 °C)

Protect from moisture. If damp, discard material

Technical Information

Compressive Strength

1 day 2,000 psi (17 MPa)
7 days 4,200 psi (29 MPa)
28 days 5,600 psi (39 MPa)

Flexural Strength

28 days 1,000 psi (7 MPa)


Mixing Ratio

6.5-7 qts (6.2- 6.6 L)

Fresh mortar density

118 lb/ft(1.9 kg/l) (ASTM C-138)

Layer Thickness

  Min. Max.
Neat 1/16” (1.5 mm) 1” (25.4 mm)(1.25″ in areas <100 sqft.)
Extended 1/4”   (6.3 mm)
  • up to 1.5” (38 mm) (35 lb. of sand per 55 lb. bag) (2″ in areas <50 sqft.)
  • up to 2” (50.8 mm) (55 lb. of sand per 55 lb. bag) (2.5″ in areas <50 sqft.)


Product Temperature

65–75 °F (18–24 °C)

Ambient Air Temperature

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).

Relative Air Humidity

< 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.

Substrate Temperature

41–86 °F (5–30 °C)

Pot Life

~ 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.

Waiting / Recoat Times

~ 30 minutes

Applied Product Ready for Use

Walk-on time: 3 hours

Suitable for overcoating with:

Non moisture sensitive floor covering 3 hours
Moisture sensitive floor covering 16 hours up to 3/8″ (9.5 mm)*


*Mat test (ASTM D-4263) above 3/8″ (9.5 mm)

The actual times will be affected by changing substrate and ambient conditions, particularly the temperature and relative humidity, plus the thickness of the material applied. When overcoating Sika® Level-425 always ensure the moisture content has achieved the required value for the subsequent floor finish adhesive / product being used, as the necessary waiting time will vary (with the application thickness and ambient humidity). Also please refer to the floor finish / adhesive PDS.



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-225.


  • Pour 5.25-6 qts. (5-5.7 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-225 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-225 layers from high ambient temperatures, direct sunlight and ensure an adequate air circulation.
  • Sika® Level-225 is not intended to be used as a wear layer even if coated or sealed. Sika® Level-225 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.




  • For applications greater than 1-1/4″ (25 mm) in depth, add 3/8″ (9.5 mm) coarse aggregate.
  • The aggregate must be non-reactive (reference ASTM C-1260, C-227 and C-289), clean, well graded, Saturated Surface Dry (SSD), have low absorption and high density, and comply with ASTM C-33 size number 8 per Table 2.
  • Pre-washed 3/8” (9.5 mm) pea-gravel can be pre-placed onto the primed area being leveled at no more than 1/3 of the total placement depth. Pour the material over the aggregate and rake to ensure proper consolidation around the aggregate and a proper bond with the substrate. Applicator must be aware that the aggregate can cause voids in the underlayment if not filled correctly.
  • Variances in aggregate may result in different strengths and flow.
  • The addition rate is 25 lb. (11.4 kg) of aggregate per bag. It is approximately 2.0 gal. (7.6 L) by loose volume of aggregates.
  • The final 1/8-1/4″ (3.2-6.3 mm) layer should be neat to allow for a smooth finished floor.
  • Do not add more water.





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

Find more Sika products and other installation materials here



Additional information

Weight 55 lbs
Dimensions 48 × 48 × 48 in


Installation Method

Apply with Trowel

Product Type

Floor Patch | Leveler


Substrate Prep

Residential | Commercial Use

Residential or Commercial


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