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Sika 55 lb. Bag Level-825 Self-Leveling Underlayment Lite


Stock#: 627821 | UPC#: (none)

Sold by the Bag | Online Sale Only

  • Suitable on gypsum, cement-based, dimensionally unstable, and other difficult substrates
  • For interior use only
  • Sets very rapidly for fast job turnaround


SKU: 627821 Category: Tags: , ,

SikaTile Level 825 Lite

Looking for a premium gypsum-based underlayment that's perfect for interior gypsum, concrete, cementitious, and various other substrates? Look no further than Sika® Level 825 Lite! This one-component, versatile, and durable product is designed to produce a self-smoothing, rapid-setting, and flat substrate that's perfect for applying your final floor finish. Whether you prefer manual or pump application, Sika® Level 825 Lite is an ideal choice for you. With a typical application thickness of 1/16" up to 2" (1.5 to 50.8mm), it's a versatile underlayment that's perfect for a wide range of applications. Try Sika® Level 825 Lite today and experience the difference for yourself!


  • Concrete
  • Gypsum
  • Cement substrates
  • Rapid-drying cement screed systems
  • OSB/Plywood only suitable for flexible coverings
  • Ceramic tiles, terrazzo, or natural stones
  • Old water-resistant adhesive residues
  • For use with SikaBond® adhesives, a minimum application of 1/8" thickness is required


  • Suitable on gypsum, cement-based, dimensionally unstable, and other difficult substrates
  • For interior use
  • Sets very rapidly for fast job turnaround
  • Low dust
  • Smooth, fluid, and workable
  • Free of cracks
  • Can be pumped
  • High strength
  • Very low shrinkage
  • Suitable for application on subfloor heating systems
  • Suitable for castor wheel loading
  • Only a 10-minute waiting time for applications over gypsum, concrete, and cement substrates when using Sika® Level-01 Primer Plus

Product Information

Chemical Base

Gypsum-based, polymer-modified binder system and fillers

Shelf Life

12 months from the 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 the material.

Technical Information

Compressive Strength

1 day 2,000 psi (13 MPa)
7 days 3,000 psi (21 MPa)
28 days 5,600 psi (33 MPa)
(ASTM C-109)

73 °F (23 °C)

50 % R.H.

Flexural Strength

28 day 1,300 psi (7 MPa)
(ASTM C-109)

73 °F (23 °C)

50 % R.H.


Mixing Ratio

6.3 qt (6 L)

Fresh mortar density

112 lb/ft(1.79 kg/l) (ASTM C-138)

Layer Thickness

Min. Max.
Neat 1/16” (1.5 mm) 1.5” (12.7 mm)*
Extended 1/2''   (12.7 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.)

*Drying Time is 1 week for 1/2" pours. For every extra 1/2" thickness poured over 1/2" an additional week of drying time is needed.

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 the 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.

Set Time

105 - 110 minutes (ASTM C-266)

Final set time

130 minutes (ASTM C-266)

Applied Product Ready for Use

Walk-on time: 3-4 hours


Suitable for overcoating with:

Non-moisture-sensitive floor covering 18 hours up to 1/8" (3.2 mm)*
Moisture-sensitive floor covering 18 hours up to 1/8" (3.2 mm)*

*Drying Time is 1 week for 1/2" pours. For every extra 1/2" thickness poured over 1/2" an additional week of drying time is needed.

*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 SikaLevel®-825 Lite 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.



30-35 ft2 at 1/4” (2.78-3.25 m2 at 6 mm) per bag

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

Application Steps


All substrates 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 of the primer and the adhesion of SikaLevel®-825 Lite.


  • Pour 6.3 qt (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 SikaLevel®-825 Lite 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 the 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 the case of two-layer applications and the second layer must not exceed the layer thickness of the first layer.
  • Protect curing SikaLevel®-825 Lite layers from high ambient temperatures, and direct sunlight and ensure adequate air circulation.
  • SikaLevel®-825 Lite does not provide an aesthetic finish and is not intended to be used as a wear layer even if coated or sealed. SikaLevel®-825 Lite 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, including 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.


Sold As: Bag
Weight Per Bag: 55 Pounds
Bags per Pallet: 50 Bags
Weight Per Pallet: 2,795 Pounds
Shipped Via: UPS Ground | LTL Truck Service

Additional information

Weight 55 lbs
Dimensions 48 × 48 × 48 in


Installation Method

Apply with Trowel

Product Type

Floor Patch | Leveler


Laminate Floor Prep, SPC Floor Prep, Stone Prep, Substrate Prep, Tile Floor Prep, Wood Floor Prep


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