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Bostik Best




KEY FEATURES

-    Over 25 years of industryleading performance

-    Moisture vapor protection

-    Bostik's Blockade TM antimicrobial protection

DESCRIPTION

Bostik's BEST® is a high performance adhesive and moisture control membrane. Its superior properties provide a tough, flexible, tenacious bond to a variety of surfaces. Bostik's BEST ® high tacking formula exhibits exceptional green grab immediately after troweling, making installation easier and more secure. This adhesive has low VOC's (as calculated per SCAQMD Rule 1168) and does NOT contain any water. Bostik's BEST® contains Bostik's BLOCKADE TM antimicrobial protection, which inhibits the growth of bacteria, mold, or mildew on the surface of the dried adhesive.

MOISTURE PROTECTION

Bostik's BEST® has low moisture vapor permeability and is not adversely affected by moisture vapor. As a result, it will reduce 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. Bostik's BEST ® may be used for concrete slabs with elevated moisture levels up to 12 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 82% RH (tested in accordance with ASTM F-2170). For substrates that have an MVER of greater than 12 lbs or > 82% RH, use Bostik's MVP4 TM prior to the application of Bostik's BEST® for unlimited moisture vapor protection, or use Bostik's Ultra-Set® SingleStep2 TM or GreenForceT.

ANTI-FRACTURE PERFORMANCE

Bostik's BEST®'s elastomeric characteristics establish an antifracture 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.

ULTIMATE VERSATILITY

Bostik's BEST® may be used to adhere all engineered, solid (adhesive only), bamboo (adhesive only), cork, and parquet hardwood flooring (adhesive only) . Bostik's BEST® may be used over all properly prepared substrates common to hardwood flooring installations including concrete, plywood, OSB, particle board (underlayment grade, above grade applications), well bonded vinyl/VCT and ceramic tile, cement backer board, gypsum underlayments (dry, above-grade), cement patch/ underlayments, radiant-heat flooring, and properly prepared terrazzo. This adhesive can also be used to install plywood as described below, as well as ceramic tile, marble, and stone inlays for light commercial and/or residential applications.

LEED® CONTRIBUTION

Bostik's Best®'s low-VOC formulation (as calculated per SCAQMD Rule 1168) may contribute toward LEED® credits under section EQ 4.1: Low-Emitting Materials - Adhesives & Sealants.

DIRECTIONS FOR USE

Read and understand data sheet completely before beginning installation. Follow industry standards and flooring manufacturer's recommendations for acclimation, design, layout, and application of wood flooring material. If jobsite conditions are outside of flooring manufacturer's recommendations, take necessary corrective actions. Whether the moisture content of substrate exceeds or is within the flooring manufacturer's recommendations, to address current or possible future subfloor moisture, sound, and cracks (up to 1/8"), apply Bostik's BEST® as directed.

SURFACE PREPARATION

Surfaces must be absorptive, clean, and free from loose materials, oil, grease, sealers, curing compounds, waxes, silicates, laitance, and all other surface contaminants that may inhibit proper bond. Completely remove cutback adhesive residue or other surface contaminants by diamond grinding, shot blasting, or scarifying to open the pores of the concrete. All surfaces to be treated must have a concrete surface profile (CSP) of 1-3 (similar to a broomed finish), as defined by ICRI (International Concrete Repair Institute, Guideline No. 03732). Maximum acceptable floor variation is 3/16" in 10 feet. Areas requiring patching or leveling must be done using a Portland cement-based material (e.g., Bostiks UltraFinishT, Webcrete® 95, Webcrete® 98 or SL-150 TM Self-Leveling Underlayment). Seal any cracks larger than 1/8" or expansion joints with Bostik 915FS TM or 955-SL TM .

PLEASE NOTE: Concrete substrate should NO TM be smooth and reflective; it must have a concrete surface profile of CSP 1-3 (similar to a broomed finish), as define by ICRI (International Concrete Repair Institute, Guideline No. 03732). It is advisable to test for adequate substrate absorption and texture in several areas throughout the jobsite by sprinkling droplets of water onto the slab. The drops of water should show signs of penetrating the substrate within one minute. This is evidenced by a water stain on the concrete without a "domed" droplet. If no signs of water penetration are shown within one minute and "domed" droplets remain (similar to drops on a car hood) the substrate will need to be mechanically textured.

INSTALLATION

The installation begins with a starter row secured to the subfloor; the starter row provides a stationary point to push against so flooring doesn't move during installation. Once the starter row is secured, apply adhesive/membrane to substrate using the appropriate trowel. See the chart on last page for proper trowel selection. Flooring may be installed using a "Wet-Lay" method of installation. For "Wet-Lay" installations, spread the adhesive and begin to install the flooring immediately. Periodically lift boards immediately after installation to ensure proper slab coverage and transfer to the back of the flooring. As you work, immediately clean any adhesive from prefinished flooring with Bostik's

Ultimate TM Adhesive Remover or mineral spirits (be careful not to harm finish), then dry buff with a non-abrasive towel.

After a few rows have been installed, and as you move across the room, tape the boards together using removable 3M #2080 Blue tape to prevent boards from sliding and to secure close-fitting joints. Rolling is recommended for all installations. Flooring that is not flat should be tacked, weighted, or rolled to ensure proper contact between the flooring and substrate.

PLYWOOD OVER CONCRETE: Score 4' x 4' or 2' x 8' sheets of 3/4" exterior-grade plywood on the backside every 8" to 10" by using a circular saw and cutting one-half the thickness of the plywood; "scoring or kerfing" takes the tension out of the plywood and helps to prevent possible warping or curling. Apply adhesive/ membrane to substrate and then set plywood into the wet adhesive/membrane. Allow the adhesive/membrane to fully cure before nailing or using Bostik's BEST® adhesive/membrane to install flooring. If nailing to the plywood, nails must not protrude through to the adhesive/membrane.

CLEAN UP

As you work, immediately clean any adhesive from prefinished flooring with Bostik's Ultimate TM Adhesive Remover or mineral spirits (be careful not to harm finish), then dry buff with a nonabrasive towel. Immediately clean all tools and equipment with Bostik's UltimateT Adhesive Remover or mineral spirits before material cures.

TROWEL CLEAN-UP TIP: Before use, cover areas of the trowel that are not used to spread the adhesive with blue tape. After use, simply tear off tape before material cures, and clean the remainder of the trowel with adhesive remover.

STORAGE/SHELF LIFE

Store at temperatures between 50°F and 100°F (10°C and 38°C). Shelf life is one year from date of manufacture in closed, original packaging.

Re-Seal Partially Used Container: With pail upright place a sheet of plastic (e.g., trash bag) over the top of the pail. Secure lid tightly over the plastic on top of pail. Carefully turn pail upside down. Plastic will help prevent the material from bonding the lid closed.  Re-Open Partially Used Container: Carefully turn pail right side up. Remove lid. Carefully cut and discard cured material and plastic from top of pail. Any uncured material may be used.

LIMITATIONS

  • Periodically check coverage of adhesive during installation;  100% substrate coverage and adhesive transfer to the back of the flooring is required to protect against damages from subfloor moisture.
  • Due to limitations with solid and bamboo wood flooring (e.g., lack of dimensional stability), "below-grade" installations are limited to engineered hardwood flooring.
  • For substrates with any history of moisture problems, or for concrete slabs exceeding 12 lb MVER or 82% RH, use a high performance moisture vapor reduction product such as Bostik's MVP4T prior to the application of Bostik's BEST®, or use Bostik's Ultra-Set® SingleStep2T or GreenForceT.
  • Do not use in areas subject to hydrostatic head.
  • Do not install solid wood flooring over VCT/vinyl.
  • Bamboo installations should follow solid hardwood flooring installation recommendations.
  • Slab temperature should be between 50°F and 95°F (10°C and 35°C) during installation.
  • Do not use on wet, dusty, contaminated, glassy smooth or friable substrates; do not use over substrates/slabs treated with sealers or curing compounds.
  • Completely remove all adhesive residue and other surface contaminants by diamond grinding, shot blasting, or scarifying.
  • Do not use over perimeter bonded flooring material.
  • Use over gypsum-based/underlayments is limited to dry, "above-grade" installations where the gypsum has dried hard (not dusty/powdery), with a minimum compressive strength > 2,000 psi for engineered hardwood installations, or minimum compressive strength > 2,500 psi for solid hardwood installations.
  • Please refer to flooring manufacturer's recommendations and NWFA's specifications for proper acclimation, verification of moisture content of flooring with a moisture meter, and expansion relief around perimeter throughout installation.
  • Do not use with vinyl-backed cork flooring or foamed-backed parquet.
  • Do not use Bostik's BEST® as a moisture vapor membrane beneath solid or bamboo flooring.
  • This membrane is designed to reduce moisture vapor emissions that originate/emanate from below the membrane only.
  • This membrane does NOT reduce/affect issues originating from the sides, ends, or top of flooring (ie. puddles, water, leaks, hydrostatic-head, etc.).
  • This membrane does NOT eliminate all possible moisture related or install related issues (i.e. improper acclimation of flooring, jobsite temperature/relative humidity, etc.).
  • This membrane is designed to prevent excessive variance of moisture between the top,middle, and bottom of flooring that originates from the substrate.

PACKAGING

Available in 5 gallon pails (36 pails/pallet),

2 gallon pails (96 pails/pallet),

10.1 oz cartridges (24 cartridges/case, 105 cases/pallet), and

28 oz cartridges (12 cartridges/case, 60 cases/pallet).

OPEN TIME CHART

Temperature

Humidity

40%

60%

80%

60°F (16°C)

Tack

2 Hours

1.6 Hours

1.3 Hours

Open

3.5 Hours

3.5 Hours

3 Hours

70°F (21°C)

Tack

1.6 Hours

1.3 Hours

1 Hour

Open

3 Hours

3 Hours

2.5 Hours

80°F (27°C)

Tack

1.3 Hours

1 Hour

0.6 Hour

Open

3 Hours

2.5 Hours

2 Hours

Note: This chart is for reference only; actual jobsite times may vary.

CHEMICAL & PHYSICAL PROPERTIES

Use Environments

Residential

Yes

Offices/Light Commercial

Yes

Heavy Commercial

Yes

Offices

Yes

Hospital

Yes

Exterior

No

Wet Areas

No

Substrates

Concrete

Yes

Plywood

Yes

OSB

Yes

Well-Bonded Vinyl

Yes

Terrazzo

Yes

Ceramic Tile

Yes

Cement Backer Board

Yes

Gypsum Underlayments*

Yes

Cement Patch/Underlayment

Yes

Flooring Types

Solid Hardwood

Yes

Engineered Hardwood

Yes

Bamboo

Yes

Cork

Yes

Parquet

Yes

Plywood

Yes

Ceramic Tile, Marble, Stone Inlays* 2

Yes

Cured Physical Properties

Cure Time *3
Light foot traffic
Normal foot traffic


6 to 8 hours
8 to 12 hours

Water Vapor Permeability* 4

<0.75

Concrete Moisture Vapor Limits for subfloor moisture vapor protection:
ASTM 1869 Calcium Chloride Method
ASTM 2170 Relative Humidity Test



< 12 lbs/ 1000 sq.ft./24 hrs
< 82% RH

Elongation

>150%

Service Temperature

-40°F to 150°F (-40°C to 66°C)

Application Properties

Ease of Troweling

Easy

Odor

Mild

Open/Working Time* 5

180 min

Color

Tan

Density (lbs/gallon)

12.66

Percentage of Water* 6

0%

Percentage of Adhesive Coverage Required:
Engineered
Solid

For Moisture
100%
100%

For Bond
>80%
>95%

Application Temperature

50°F to 100°F (10°C to 38°C)

Chemical Properties

Chemistry Type

1-Part Urethane

Adhesive Type

Moisture Cure

VOC Compliant (calculated per SCAQMD Rule 1168)

Yes (86 g/L)

Flash Point, closed cup

142°F(61°C)

* Dry, above grade

* 2 Residential or light commercial only

* 3 Humidity affects cure to a greater degree than temperature; the higher the humidity, the faster the cure. Under normal conditions, light foot traffic is acceptable after 6 to 8 hours; normal traffic after 12-16 hours.

* 4 Per ASTM E-96 Standard Test Methods for Water Vapor Transmission of materials. Ratings are g/m2-24 hour-mmHG.

* 5 Please refer to the Open/Working Time Chart.

* 6 Per ASTM E203-01 Standard Test Method for water using Volumetric Karl Fischer Titration Method. Results rounded to the nearest tenth. Test Method has error range of +/- 0.2%.

TROWEL SELECTION

In order to form a membrane that functions properly for moisture vapor protection, the right trowel needs to be selected to achieve both 100% coverage of the substrate and 100% transfer to the back of the flooring. Jobsite conditions, profile of the substrate, depth of back channeling in the flooring, and other factors affect the amount of adhesive that must be applied to achieve proper coverage and transfer. Always pull a board at the beginning of and during the installation process to confirm adequate coverage and transfer. Trowel size may need to be changed to achieve the required coverage and transfer. See trowel suggestions below.

ADHESIVE & MOISTURE MEMBRANE INSTALLATION METHOD
Suggested Trowel (For use as an adhesive only, refer to adhesive only installation method.)

Engineered wood flooring up to 5/8" thick.
Coverage: 30-35 sq.ft. per gallon  

Engineered wood flooring >5/8" thick, or plywood.
Coverage: 20 sq.ft. per gallon

Trowel size is suggested to maximize coverage of adhesive. Periodically lift a board to ensure the following conditions are being met: 100% coverage of concrete substrate and 100% transfer to the back of the flooring product. Uneven subflooring may require the use of either a leveling/patching material, or a larger V-notched trowel for proper coverage of adhesive.

ADHESIVE ONLY INSTALLATION METHOD
Suggested Notched Trowel (For use as an adhesive and moisture control membrane, refer to chart above.)

Engineered hardwood flooring <1/2" thick. Coverage: 50 sq.ft./gallon

<1/2" Parquet, or cork underlayment.

Coverage: 80 sq.ft./Gallon

Engineered hardwood flooring >1/2" thick, Solid wood or bamboo flooring <1/2" thick, and parquet <3/4" thick. Coverage: 40 sq.ft./gallon

Solid wood or bamboo flooring >1/2" thick, or plywood. Coverage: 35 sq.ft/gallon

Trowel size is suggested to maximize coverage of adhesive. Periodically check coverage of adhesive during installation: >80% coverage and transfer to the back of the flooring is required for all engineered wood flooring; >95% coverage and transfer is required for all solid wood flooring or bamboo flooring products.

CAUTION

COMBUSTIBLE. HARMFUL IF SWALLOWED OR INHALED. CONTAINS POTENTIAL SENSITIZER. MAY CAUSE ALLERGIC SKIN OR LUNG REACTION. MAY IRRITATE EYES, SKIN AND RESPIRATORY TRACT. Do not breathe fumes. Do not get in eyes, on skin or on clothing. Do not swallow. Use only in a well-ventilated area or wear mask. Keep away from flames or sparks. Wash thoroughly after handling. Store container in a cool (60-80°F / 15°-30°C), dry area with lid tightly sealed. Do not reuse container.

LIMITED WARRANTY

Limited Warranty found at www.bostik-us.com or call 800.726.7845. TO THE MAXIMUM EXTENT ALLOWED BY LAW, BOSTIK DISCLAIMS ALL OTHER EXPRESS OR IMPLIED WARRANTIES, INCLUDING WITHOUT LIMITATION WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. UNLESS OTHERWISE STATED IN THE LIMITED WARRANTY, THE SOLE REMEDY FOR BREACH OF WARRANTY IS REPLACEMENT OF THE PRODUCT OR REFUND OF THE BUYER'S PURCHASE PRICE. BOSTIK DISCLAIMS ANY LIABILITY FOR DIRECT, INCIDENTAL, CONSEQUENTIAL, OR SPECIAL DAMAGES TO THE MAXIMUM EXTENT ALLOWED BY LAW. DISCLAIMERS OF IMPLIED WARRANTIES MAY NOT BE APPLICABLE TO CERTAIN CLASSES

OF BUYERS AND SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE ABOVE LIMITATIONS MAY NOT APPLY TO YOU. It is the buyer's obligation to test the suitability of the product for an intended use prior to using it. The Limited Warranty extends only to the original purchaser and is not transferable or assignable. Any claim for a defective product must be filed within 30 days of discovery of a problem, and must be submitted with written proof of purchase.

This document supersedes all previously published literature.

Bostik, Inc.
11320 W. Watertown Plank Road
Wauwatosa, Wl 53226
www.bostik-us.com