Bona R850T® Adhesive
Bona R850T® provides outstanding adhesion to a variety of surfaces and allows for the natural
movement of wood flooring. Use along the leading edge of refinished or sold plank floors, coupled
with staple or nail down system.
• Eliminates cracking and popping
• Useful for prefinished floors due to ease of cleanup
• Perfect alternative to face nailing close-out rows, board replacement, stairs, risers, and
• GREENGUARD Gold Certified
Ingredients – Calcium carbonate, silane modified
prepolymer, plasticizers, amorphous silica
Base – Silane Modified-Prepolymer
Color – Cream
Density – 12.5 lbs./ gallon
VOC Content – ZERO VOC
Max Shear Strength – 335 psi (at final cure; lap sheer
test, 1 mm gap)
Max Elongation – 250%
Sound Reduction Rating – 70dB per ASTM E492-04
IIC (6” concrete slab with ceiling)
Odor – Non-offending
Flash Point – >100º C (212ºF) (Pensky-Martens)
Stability – 12 months from date of manufacture in
unopened, original packaging
Open Time - 40 minutes
Coverage – 60 linear feet per tube with ¼” bead
Curing – Light foot traffic - 8-10 hours
Furniture, fixtures - 12-24 hours
Unfinished floor sanding - after 24 hours
• Replaces top nailing on close-out rows and board
• Supplemental fastening for wide plank boards
when nailing and gluing are needed
• Idea for projects where traditional fastening isn’t
practical – hard to reach areas, radiant heat floor
• Commercial and residential. Use with solid or
engineered prefinished and unfinished flooring;
on, above, or below grade. May be used on both
wood and concrete substrates
ACCLIMATION AND SITE CONDITIONS
Acclimate adhesive and flooring to room temperature at the jobsite 72 hours before installation. Building climate control system must be functioning with a temperature of 65ºF - 80ºF and maximum relative humidity of 70% for 72 hours before flooring is installed, during installation, and for 72 hours after installation.
Moisture testing: For concrete slabs, conduct moisture testing per ASTM test methods F1869 Test
for Measuring Moisture Vapor Emission Rate (MVER) of Concrete Subfloor Using Anhydrous Calcium Chloride and/or F2170 Test Method for Determining Relative Humidity in Concrete Floor Slabs Using in SituProbes. Contact ASTM International to obtain copies of the test methods before proceeding. MVER using ASTM F1869 (Calcium chloride test) must not exceed 15 lbs/24 hours/1000 square feet. Relative Humidity using ASTM F2170 (RH Probe test) must not exceed
85%. If readings exceed these limits, DO NOT USE BONA R850T. For wood substrates, follow flooring manufacturer’s guidelines including moisture content and required moisture measuring methods.
Substrate must be clean, smooth, dry, free of loose material and structurally sound, with the surface slightly textured for best adhesion (similar to a light broom finished concrete). Remove adhesive residue, paint, concrete curing compounds or other contaminants that may affect adhesive bond. Surface cracks, grooves, depressions, control joints or other non-moving joints, and other irregularities must be filled or smoothed with a Portland Cement based patching and levelling compound. Substrate must be level to 3/16” in a 10-foot span. Do not install wood
flooring before the compound has fully cured. Do not install over expansion joints or other moving joints in a concrete slab. Slab temperatures must be between 55º and 95ºF. Suitable substrates include concrete, plywood, particle or chip board, stone, ceramic, terrazzo, Warmboard®, radiant heat flooring (refer to manufacturer’s recommended installation instructions) and dry above-grade gypsum underlayment, recycled rubber underlayment.
Bona R850T will not prevent moisture-related damages to wood flooring originating from the top,
sides or ends of flooring (water leaks, puddles, hydrostatic head, etc.) nor does it eliminate other
moisture or installation related issues such as improper acclimation of flooring or the effects of jobsite temperature and humidity.
DO NOT USE BONA R850T
• On wet, contaminated or friable surfaces
• Over concrete curing compounds, sealers or other
surface treatments that could affect adhesion
• On areas subject to hydrostatic head
• On cutback residue, or over vinyl/VCT
• On chemically treated woods (stain, preservatives,
• As a leveling compound
• Remove end cap of applicator gun and pull back
• Insert R850T tube into applicator gun, snip the
exposed end of the R850T tube.
• Replace end cap – make sure to use the supplied
• Apply by pulling applicator gun trigger.
Apply adhesive along the entire length of the
board for best results.
Clean adhesive from the surface of the floor
immediately, while wet. Use mineral spirits on a clean
Store in a climate controlled environment. Keep from