Installation Guide

URETHANE WOOD FLOORING ADHESIVE
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.
OPEN TIME CHART
Temperature
Humidity
40% 60% 80%
60˚F (16˚C)
Tack 2 Hours 1.6 Hours 1.3 Hours
Open 3.8 Hours 3.5 Hours 3.2 Hours
70˚F (21˚C)
Tack 1.6 Hours 1.3 Hours 1 Hour
Open 2.8 Hours 2.5 Hours 2.2 Hours
80˚F (27˚C)
Tack 1.3 Hours 1 Hour 0.6 Hour
Open 2.3 Hours 2 Hours 1.7 Hours
Note: This chart is for reference only; actual jobsite times may vary.
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.
1/4" x 1/4" V-Notch
1/4" x 1/4" x 1/4" Square Notch
1/2" x 15/32" V-Notch 1/4" x 3/8" x 1/4" Square Notch
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.
3/16" x 5/32" V-Notch
1/4" x 1/4" x 1/4" Square Notch
1/4" x 1/4" x 1/8" Square Notch
1/8" x 1/8" x 1/8" Square Notch
This document supersedes all previously published literature.
Bostik, Inc.
11320 W. Watertown Plank Road
Wauwatosa, WI 53226
www.bostik-us.com
BOSTIK HOTLINE™
Smart help™
1-800-726-7845