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Sika MB Epoxy Moisture Barrier 2.6 Gallons

Original price was: $399.99.Current price is: $309.00.

Stock#: 401521 | UPC#: 338861363720

Sold by the Bucket | Online Sale Only

  • Solvent-free (100 % solids)
  • Easy roller applied application, low viscosity
  • Convenient, easy-to-mix packaging


SKU: 401521 Category: Tag:

SikaTile MB

Looking for a high-performance solution to protect your floors from subfloor moisture? Try Sika® Moisture Barrier - the solvent-free, 2-component epoxy that offers low viscosity and exceptional performance. Perfect for use with wood flooring products, floating floors, self-leveling underlayments, and other flooring systems, Sika® MB is the ideal solution for anyone looking for a reliable moisture barrier that delivers outstanding results.



  • Moisture barrier to help control moisture propagation in cementitious substrates with a moisture content not exceeding 6 % by Tramex Method, residual moisture up to 100 % R.H. or 25 lb/1,000 ft2/24 h (11.4 kg/92.9m2/24 h)
  • For substrate consolidation on concrete, cement, and gypsum screeds
  • Adhesion promoter for old and new adhesive residues in conjunction with other Sika® products
  • Suitable on concrete, cement, self-leveling and gypsum substrates, OSB, plywood, quarry and terrazzo tiles, water-soluble adhesive, and cutbacks


  • Solvent-free (100 % solids)
  • Easy roller applied application, low viscosity
  • Convenient, easy-to-mix packaging
  • Shorter construction periods
  • Excellent penetration and stabilization of the substrate
  • Reduction of adhesive consumption
  • Suitable for use on floors with radiant heating
  • Compatible with SikaBond® wood flooring adhesives, Sika® Level products
  • Can be used below floating floors


Sustainability | Certifications | Approvals



  • Meets ASTM F 3010

Product Information

Chemical Base

Two-component epoxy

Shelf Life

24 months from the date of production if stored properly in undamaged sealed containers

Storage Conditions

Store dry at 50–77 °F (10–25 °C). Protect from moisture.


69 lb/ft(1.1 kg/l)

Technical Information

Shore D Hardness

7 days 83 (mixed A&B)

Compressive Strength

7 days 10,000 psi (69 MPa)

Permeability to Water Vapor

0.06 g/m2-24hour-mmHG (ASTM E-96)

Service Temperature

-40–158 °F (-40–70 °C)


Pot Life

50 °F (10 °C) ~ 60 minutes
68 °F (20 °C) ~ 30 minutes
86 °F (30 °C) ~ 15 minutes


Cure Time

50 °F (10 °C) 18 hours
73 °F (23 °C) 8 hours
86 °F (30 °C) 6 hours

* Minimum curing time, prior to walking on primer/or for applying SikaBond® or Sika® Level.

Application Time

Overcoating Application Time Window* Minimum Maximum
Sika® MB

(2nd coat)

8 hours 36 hours

* When Sika® MB is left on the substrate for more than the maximum allowable open time, the surface must be mechanically prepared (i.e. sanded) solvent wiped before proceeding.

Application Steps


All surfaces must be between 40º F (4º C) to 90º F (32º C) and structurally sound (deflection not to exceed 1⁄360 of the span), dry, clean, and free from oil, grease, wax, paint, old adhesives, sealers, and curing compounds.
Any contaminates which inhibit proper bonds must be removed.
Substrate preparation should be completed following ANSI A108 AN-2 “General Requirements for Sub-surfaces”.
All substrates should be plumb and true, surface deviation should not exceed 1⁄4" in 10’.
Patching, leveling, or areas requiring a mortar bed should be prepared using SikaLevel® Underlayments. Movement (Expansion) joints should be provided to comply with TCNA method EJ171.
Concrete must be free of any negative hydrostatic pressure and/or excessive moisture.




Coverage per pail
Moisture barrier 250–300 ft2 (23.2–27.9 m2)
Adhesion promoter or

surface consolidator

400–450 ft(37.2–41.8 m2)

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


Application Recommended


Results in
Moisture barrier only min. 1 Mirror-like finish

consolidation only

min. 1 Good penetration
Adhesion promotion only min. 1 Mirror-like finish
Moisture barrier +

substrate consolidation

min. 2 Mirror-like finish
Moisture barrier +

adhesion promotion

min. 2 Mirror-like finish

MUST produce a monolithic, pinhole-free finish with a continuous film. The need for multiple coats is directly related to surface absorption.

Application Steps


  • The substrate must be clean, dry, sound, and homogeneous, free from oils, grease, dust, and loose or friable particles. Paint, laitance, and other poorly adhering contents must be mechanically removed.
  • The substrate must have an open textured surface to allow Sika® MB to penetrate. (i.e. Blast cleaning and grinding are considered acceptable means to achieve the desired surface profile. Acid and chemical etching are not acceptable).
  • At least 50 % of the surface area must be cleared of residual adhesive and cutbacks. (i.e. by grinding or mechanical substrate preparation)
  • Old cutbacks can contain asbestos which is dangerous for the health so do not grind, sand, or blast. Refer to the Resilient Floor Covering Institute’s publication “recommended work practice for Removal of resilient floor coverings” for instructions.
  • Minimum substrate compressive strength > 1,160 psi. Tensile Bond strength > 116 psi at the time Sika® MB is applied.
  • Repair with Sika® Level SkimCoat or SikaQuick® mortar before priming.
  • The floor must be cleaned with an industrial vacuum prior to installation of the Sika® MB.
  • On fiber-reinforced concrete, fibers should be flamed off the surface prior to the application of Sika® MB as a moisture barrier.
  • Before overall installation begins, Sika® recommends the application of several small test patches to determine primer application requirements and the acceptability of final product performance.


  • Add one full can of component A to one full can of component B then mix with an electric drill and mixing (Jiffy Mixer type) paddle at a low speed to reduce air entrainment (300–400 rpm). Using a paint stick or similar is not sufficient to mix the primer.
  • A minimum mixing time of 3 minutes shall be observed; mixing shall continue until a homogeneous mix has been achieved.
  • Scrape the sides of the pail with a paint stick or paddle to ensure all contents are thoroughly mixed together.
  • Unmixed material applied to the floor will not cure properly.


  • Clean all tools and application equipment with cleaning solvent (Xylene and MEK are effective).
  • Hardened/cured material can only be removed mechanically.


Sold As: Bucket (2.64 Gallons)
Weight Per Bag: 50 Pounds
Shipped Via: UPS Ground / LTL Delivery


Additional information

Weight 50 lbs
Dimensions 24 × 12 × 12 in


Installation Method

Applied with Paint Roller, Pour Directly on the Sub-Floor

Product Type

Moisture Barrier, Moisture Guard


Substrate Prep


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