Bostik's EFA+™ for an easy-to-trowel elastomeric urethane hardwood floor adhesive & moisture vapor retarder.

    Key Features

    • Easy spread
    • Great ridge retention
    • Low VOC

    Wood Flooring Adhesive and Moisture Vapor Retarder

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    Bostik EFA+™ is an easy-to-spread, low-VOC urethane hardwood flooring adhesive

    Bostik’s EFA+™ is an easy-to-trowel urethane adhesive and moisture control membrane. It provides a tough, flexible, tenacious bond to a variety of surfaces. Bostik’s EFA+™ elastomeric characteristics allow the adhesive to move with the wood as it expands and contracts over the life of the floor. Bostik’s EFA+™ exhibits a long open time making installation easier and faster. This adhesive has low VOC’s and does NOT contain any water.

    EFA+™ provides moisture protection

    Bostik’s EFA+™ has low moisture vapor permeability and is not adversely affected by moisture. As a result, it will reduce moderate amounts of moisture vapor transmission through the concrete. When applied as directed as a moisture vapor membrane, it will prevent damages caused by subfloor moisture beneath dimensionally stable, engineered wood flooring only. 

    EFA+™ may be used for concrete slabs with elevated moisture levels up to 6 lbs. per 1,000 square feet per 24 hours (using an anhydrous calcium chloride test kit according to ASTM F-1869 test method), and up to 80% RH (tested in accordance with ASTM F-2170). For substrates that have an MVER of greater than 6 lbs or 80% RH, use Bostik’s MVP4™ prior to the application of Bostik’s EFA+™ for unlimited moisture vapor protection, or use Bostik Ultra-Set® SingleStep2™ or GreenForce®.

    EFA+™ provides superior elasticity and anti-fracture performance

    The elastomeric characteristics of Bostik's EFA+™ establish an anti-fracture membrane that can bridge cracks up to 1/8" (3mm), which can occur in the substrate prior to or after installation. This superior elasticity allows the adhesive to move with the wood as it expands and contracts with changes in humidity and temperature over the life of the floor.

    Use Bostik EFA+™ for ultimate versatility

    Use Environments Substrates Flooring Types
    Residential Concrete Solid Hardwood (adhesive only)
    Offices/Light Commercial Plywood Engineered Hardwood
    Heavy Commercial OSB Bamboo (adhesive only)
      Recycled Rubber Underlayment Cork
      Well-Bonded Vinyl Parquet (adhesive only)
      Terrazzo Plywood
      Ceramic Tile Ceramic Tile, Marble, Stone Inlays (residential or light commercial only)
      Cement Backer Board  
      Gypsum Underlayments (dry, above grade)  
      Cement Patch/Underlayment  




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