Specifications

Brand

Bostik

SKU

BOSTIK-GREENFORCE-4GAL

Warranty

Bostik limited warranty: lifetime for adhesion and for subfloor moisture vapor protection, where Bostik defines lifetime as the flooring manufacturer's maximum warranty period (25 years if no flooring warranty applies). It requires installation to Bostik's current technical data sheet, covers the original purchaser only and is not transferable; nails through the cured membrane void the moisture vapor protection. Exclusions include moisture above the limits in Bostik's data sheet or the flooring maker's instructions, flooding, leaks, hydrostatic head, and a missing or faulty vapor retarder under the slab (ASTM E1745). Terms, conditions and exclusions apply: see the warranty document.

VOC

0 g/L, calculated per SCAQMD Rule 1168; contains no water. Bostik states this formulation may contribute toward the LEED v4 EQ credit Low-Emitting Materials (interior adhesives and sealants), depending on all other products used

Coverage

Adhesive, moisture vapor and sound membrane: 30–35 sq ft/gallon for solid, engineered or bamboo flooring up to 5/8" thick; 20 sq ft/gallon over 5/8" or for plywood. Adhesive only: 50 sq ft/gallon (engineered up to 1/2"), 80 (parquet up to 1/2" or cork underlayment), 40 (engineered over 1/2", solid or bamboo up to 1/2", parquet up to 3/4"), 35 (solid or bamboo over 1/2", or plywood). Suggested figures: jobsite conditions, substrate profile and back channeling change the amount needed

Substrates

Properly prepared concrete (concrete surface profile CSP 1–3 and porous per ASTM F3191), plywood, OSB, well-bonded vinyl/VCT and ceramic tile, cement backer board, gypsum underlayments (dry, above grade, with the minimum compressive strength in the TDS), cement patch/underlayments, radiant-heat flooring, properly prepared terrazzo and recycled rubber underlayments. Not over sealers or curing compounds, or wet, dusty, glassy, smooth or friable surfaces; not in areas subject to hydrostatic head. On- or below-grade slabs need a vapor barrier (6 mil poly or better) below the slab

Product type

One-part AXIOS® Tri-Linking™ Polymer, moisture-cure wood flooring adhesive, moisture vapor control membrane and sound reduction membrane in one product. Colour beige; density 14.25 lbs/gallon; 0% water

Trowel notch

Membrane method: 1/4" x 1/4" V-notch or 1/4" x 1/4" x 1/4" square notch up to 5/8" thick; 1/2" x 15/32" V-notch or 1/4" x 3/8" x 1/4" square notch over 5/8" or plywood. Adhesive only: 3/16" x 5/32" V-notch (engineered up to 1/2"), 1/8" x 1/8" x 1/8" square notch (parquet or cork underlayment), 1/4" x 1/4" x 1/8" square notch (engineered over 1/2", solid or bamboo up to 1/2", parquet up to 3/4"), 1/4" x 1/4" x 1/4" square notch (solid or bamboo over 1/2", plywood). Pull boards to confirm coverage: 100% for moisture protection; over 80% (engineered) or over 95% (solid, bamboo) for bond only

Container size

4 gallon plastic pail (36 pails per pallet)

Sound reduction

Bostik ties sound reduction to its adhesive, moisture vapor membrane and sound trowel method. Its data sheet lists, for an 8" concrete slab: ASTM E492-09 IIC 51 dB with no ceiling and 66 dB with one layer of 5/8" gypsum board ceiling; ASTM E90-09 STC 57 dB with no ceiling and 61 dB with that ceiling. These are the results for those assemblies, not a rating for every floor

Moisture control

Moisture vapor control membrane when installed as the TDS directs: concrete moisture limits ASTM 1869 (calcium chloride) and ASTM 2170 (relative humidity): none, dry to the touch; water vapor permeability below 0.4 g/m²·24h·mmHg (ASTM E-96). Bridges cracks up to 1/8" (3 mm). Requires 100% substrate coverage and 100% transfer to the back of the flooring. Does not address water from the top, sides or ends of the floor (puddles, leaks, wet mopping) or hydrostatic head. Glue assist with the 28 oz cartridge is for bond only and gives no moisture vapor protection

Applicable flooring

Engineered, solid, bamboo, cork and parquet wood flooring, with no restriction on board width or length; also plywood, and ceramic tile, marble and stone inlays in residential or light commercial use. Below grade is limited to engineered hardwood. Not for solid wood over VCT/vinyl, vinyl-backed cork, foam-backed parquet or perimeter-bonded flooring. Not for exterior or wet areas

Installation conditions

Application temperature 50–100°F (10–38°C); slab temperature 50–95°F (10–35°C) during installation; open/working time 60 minutes in Bostik's table, and from about 30 minutes to 2.3 hours in its open-time chart depending on temperature and humidity. Bostik's table gives light foot traffic after 8–12 hours and normal traffic after 12–24 hours; humidity affects cure more than temperature. Store at 50–100°F; shelf life one year from manufacture in the closed original pail

Documents

• Technical data sheet (Bostik, 09/22/2023)
• Safety data sheet (Bostik) — read before use
• Limited warranty (Bostik commercial hardwood flooring installation products)

About this product

Bostik GREENFORCE® is a one-part wood flooring adhesive that also forms a moisture vapor control membrane and a sound reduction membrane. It is built on Bostik's AXIOS® Tri-Linking™ Polymer Technology, a moisture-cure formulation that Bostik says keeps the long-term durability and moisture vapor protection of high-end urethane adhesives while being easier to spread and to clean off prefinished flooring. Bostik states it has zero VOCs as calculated per SCAQMD Rule 1168, contains no water, and can bridge substrate cracks up to 1/8" (3 mm). Concrete moisture vapor testing is not required when the slab is properly prepared, dry to the touch and fully cured. The moisture vapor protection depends on 100% substrate coverage and 100% transfer to the back of the flooring with the trowel Bostik specifies; it does not protect against water from above or the sides of the floor, or hydrostatic pressure. Sold here as the 4 gal pail. Price and availability on request.