Instructions / Assembly

Page 4
Performance Core T&G Installation Instructions 020818
M908/WUA2 Pro Tack Adhesive
A trowel applied moisture curing urethane adhesive for the installation of glue down flooring
installations over concrete and wood substrates.
TYPICAL TROWEL AND APPROXIMATE COVERAGE*
3/16” x 1/4” x ½” V-notch trowel: 50 to 65 square ft. per gallon.
*Coverage is based on application to a clean, smooth concrete substrate; therefore, application
rate may vary depending on substrate conditions
NOTE: Do not apply over self-stick tile, sheet vinyl, old adhesives, metal, linoleum, laminate,
particleboard or strip wood sub-floors without first covering with an approved wood or wood
composite underlayment. Air temperature must be between 50 F and 100 F for applying ProTack
M908/WUA2 Urethane Adhesive.
• Product must be used in its entirety when opened. Lid cannot be re-sealed.
• Temperature and humidity will affect the curing time. The higher the temperature and humidity,
the faster the cure.
APPLICATION
1. Regulate temperature and humidity 72 hours before, during and after installation.
2. Spread adhesive using recommended trowel, ensuring 95 – 100% adhesive contact.
Wet-lay method: Press flooring firmly into adhesive immediately after troweling.
Walk-on method: Press flooring firmly into adhesive after it has developed its initial grab
(typically, after 15 to 20 minutes).
3. Remove any adhesive smudges or drops immediately as adhesive is very difficult to remove
once allowed to dry. Clean tools while adhesive is fresh using a urethane adhesive remover or
mineral spirits.
4. Avoid light/regular foot traffic for at least 12 hours. Avoid heavy foot traffic for at least 24 hours.
Use clean white terry cloth towels with mineral spirits to clean as you go. It is easy and convenient to use.
Adhesive that has cured on the surface of the flooring can be difficult to remove.
Getting Started Direct Glue:
There are two ways to install when using a moisture cured urethane wood flooring adhesive (wet
lay meaning to lay directly into wet adhesive and dry-lay method meaning to allow the adhesive to
flash or to tack up.)
Caution: Whether you choose to install using the dry or wet method, follow all guidelines set by
the adhesive manufacturer as well as the flooring manufacturer. By not adhering to the guidelines
you can void your flooring warranties.
General Information for Glue-Down Installations
1. Use cement-based patch, skim coat leveling products to correct substrate imperfections.
2. Regulate temperature and humidity 72 hours before, during and after installation.
3. Install and secure starter row.
4. Spread adhesive using recommended trowel, ensuring 95 to 100% adhesive contact. Wet Lay
method: press flooring firmly into adhesive immediately after troweling. After the flooring is place,
roll the entire installation with a 75 lb. smooth roller.
5. Inspect the installation and remove any adhesive smudges or drops immediately using mineral
spirits. NOTE: Urethane adhesive is very difficult to remove once dry and cured. Make every effort
to prevent adhesive from getting on the flooring surface. For best results, keep a urethane adhesive
cleaner or mineral spirits nearby to remove any adhesive smudges or drops during installation.
6. Clean tools while adhesive is fresh using a urethane adhesive cleaner or mineral spirits.
7. Avoid light/regular traffic for at least 12 hours. Avoid heavy traffic for at least 24 hours.
8. See adhesive manufacture guidelines for OPEN TIME on the adhesive container.
9. Proper ventilation within the room must be provided. An electric fan is helpful.
Step 1 (Wet Lay Method)
Select a starter wall. It is recommended to start the installation along an exterior wall. It’s more
likely to be straight and square with the room. Measure out from the wall the width of two planks
plus 3/8” expansion and mark each end of the room and snap your chalk line.
Step 2
Spread adhesive from the chalk line to the starter wall using the recommended trowel size. It is
important to use the correct trowel at a 45° to get the proper spread of adhesive applied to the sub-
floor, which will produce a proper and permanent bond. Improper bonding can cause loose or hollow
spots.
Note: Change the trowel every 2000 to 3000 square feet (or sooner as needed) due to wear down
of the dimples. This assures you always get the proper spread of adhesive.
Step 3
Install the first row of starter planks with the tongue facing the starter wall and secure into position.
Alignment is critical and can be achieved by securing a straight edge along the chalk line (2x4’s work
well), or by top nailing the first row with finishing nails (wood sub-floor), or adjustable spacers
(concrete sub-floor). This prevents slippage of the planks that can cause misalignment.
Note: The planks along the wall may have to be scribed and cut to fit in order to maintain a consistent
expansion space since most walls are not straight .Try to maintain at least 2” on the scribed plank.
Step 4
Once the starter rows are secure
spread 2 ½ to 3 feet of adhesive the
length of the room. (Never lay more
adhesive than can be covered in
approximately 1 hr.) Place tongue
into groove of plank or strips and
press firmly into adhesive. Never
slide planks or strips through
adhesive. Use Uniclic Tapping
Block if necessary to fit planks snug
together at side and butt ends. Clean any adhesive off the surface before it cures using clean terry
cloth towels and mineral spirits.
Note: Never work on top of the flooring when installing. If you must work on top of the newly laid
flooring use a kneeling board.
Secure your starter rows with a straight edge (2x4’s). Once the remainder of the floor has been
installed, go back to the beginning and remove the straight edges and spread adhesive on the
remainder of the open sub-floor. Remember planks closest to the wall may have to be scribed and
cut to fit due to irregularities along the wall. When using Mohawk’s Pro-Tack M908/WUA2
adhesive it is not necessary to roll the floor.
Clean Up
Use clean white terry cloth towels to clean as you go along with mineral spirits. It is easy and
convenient to use. Adhesive that has cured on the surface of the flooring can be difficult to remove.
Light foot traffic is allowed after 12 hours but wait 24 hours after installation to remove the Low
Adhesion Delicate Surface Painters Tape. Once the tape is removed clean any adhesive residue left
from the tape using mineral spirits on a clean white terry towel.
Final Touches
Trim excess underlayment (floating installation only) and install or re-install any transition pieces,
reducer strips, T-moldings, thresholds, bases and/or quarter round moldings. Trims and moldings
should be nailed into the wall, or subfloor, not the floor. Install the proper trim molding at the
doorways to achieve the transition and along the walls to cover the edges of any gaps along the wall
due to irregularity.
Complete the job by using the wood filler that coordinates with the installed engineered flooring for
minor corrections or areas where brad nails were used in the trim or the flooring. Clean the finished
floor with Performance Accessories Cleaner.
To prevent surface damage, avoid rolling heavy furniture and appliances on the floor. Use plywood
or appliance lifts if necessary. Use protective castors/castor cups or felt pads on the legs of furniture
to prevent damage to the flooring.
Clean Up
Use clean white terry cloth towels to clean as you go along with mineral spirits. It is easy and
convenient to use. Adhesive that has cured on the surface of the flooring can be difficult to remove.
Measures should be taken to protect floors from other trade work.
If the floor is to be covered, the floor should be thoroughly cleaned prior to covering to
prevent grit damage to the finish. Do not cover with plastic, red rosin, felt or wax paper or
previously used cardboard. Instead use a breathable material such as clean, dry, plain
uncoated cardboard or Kraft paper. Inks from printed cardboard could damage the hardwood
floor.
A common reinforced builder’s paper is a good choice. Any covering should be taped, using
a low-adhesion tape, to base or shoe moldings. Avoid taping to finished flooring. When
taping paper or sheets together, tape them to each other, not to the floor. The floor must be
completely covered to eliminate uneven ambering from exposure to