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EFA+™

Wood Flooring Adhesive and Moisture Vapor Retarder
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Product overview

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

Geographic availability
  • Canada
  • United States of America
Available sizes
4 gallon pail

Smart Advantages

 
Easy spread
Great ridge retention
Low VOC

Latest news

Oct 25 2023
  • Wall & Floor
  • Campaigns
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Bostik Announces Winner of Motorcycle Sweepstakes Contest

Bostik, Inc., a world-class leader in specialty adhesives and flooring installation systems, ...
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Apr 25 2023
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  • Bostik Academy
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Bostik to Aid NFCAP Train Flooring Contractors Nationwide

The National Flooring Contractors Apprenticeship Program (NFCAP), launched officially in 2020, ...
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Next events

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JLC LIVE 2024 | Residential Construction Show

Conference: March 21-23, 2024
Exhibits: March 22 & 23, 2024
Rhode Island Convention Center
1 Sabin Street
Providence, RI 02903

JLC LIVE is the most anticipated regional trade event of the year for residential construction. ...

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Bostik Academy
Advanced Flooring Prep & Adhesives

March 14, 2024
8:00 AM - 4:00 PM
BPI
1316 North Hills Blvd. Suite 1 
North Little Rock, AR 72114
501-490-1924

Presented by Bostik, learn about our innovative flooring Surface Prep and Adhesive Solutions.

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Bostik Academy
Advanced Flooring Prep & Adhesives

March 12, 2024
8:00 AM - 4:00 PM
BPI
3263 Sharpe Avenue 
Memphis, TN 38111
631.249.3232

Presented by Bostik, learn about our innovative flooring Surface Prep and Adhesive Solutions.

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Bostik Academy
Advanced Flooring Prep & Adhesives

March 5, 2024
8:00 AM - 4:00 PM
Bostik Academy – Dallas
5111 Catron Drive
Dallas, TX 75227
631.249.3232

Presented by Bostik, learn about our innovative flooring Surface Prep and Adhesive Solutions.

Bostik’s EFA+ provides moisture protection

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 15 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 87% RH (tested in accordance with ASTM F-2170). For substrates that have an MVER of greater than 15 lbs or 87% RH, use Bostik’s MVP4™ prior to the application of EFA+ for unlimited moisture vapor protection, or use Bostik's Ultra-Set® SingleStep2™ or Bostik's GreenForce®

EFA+ provides superior elasticity and anti-fracture performance

EFA+’s elastomeric characteristics 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 EFA+ for ultimate versatility

Use Environments Substrates Flooring Types

Residential

Concrete

Solid Hardwood

Offices/Light Commercial

Plywood

Engineered Hardwood

Heavy Commercial

OSB

Bamboo

 

Recycled Rubber Underlayment

Cork

 

Well-Bonded Vinyl

Parquet

 

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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