Wood Flooring Adhesive, Moisture & Sound Barrier – Bostik SingleStep2 (4 Gal)

All-in-One Wood Flooring Adhesive, Moisture Control & Sound Reduction Membrane

Bostik Ultra-Set® SingleStep2™ is a professional 3-in-1 flooring installation system that functions as a wood flooring adhesive, moisture vapor barrier, crack isolation membrane, and sound control underlayment—all in one step. It eliminates the need for separate moisture systems, sound mats, or primers while delivering long-term performance for residential and commercial projects.

Formulated with AXIOS® Tri-Linking Polymer Technology, this advanced adhesive offers the strength of urethane with easier spreading and faster cleanup. It contains 0% VOCs and 0% water and includes antimicrobial protection to resist mold and mildew on the cured membrane.

Key Benefits

• 3-in-1 System: Adhesive + moisture control + sound reduction in one product
• Superior Sound Control:
  • ΔIIC: up to 21 dB
  • IIC: up to 70
  • STC: up to 67
• Lifetime Moisture Protection Warranty
  • Extremely low water vapor permeability (<0.4)
  • No moisture testing required when slab is dry to the touch
• Crack Isolation: bridges cracks up to 1/8”
• Thickness Control™ Technology maintains membrane thickness under load
• Walk-On-Work Installation: will not collapse under foot traffic or mallet use
• Antimicrobial Protection resists mold and mildew growth
• 0 VOCs, solvent-free, water-free

Approved Flooring Types

• Solid hardwood
• Engineered hardwood
• Bamboo
• Cork
• Parquet
• Plywood
• Stone, marble, and ceramic inlays (light commercial & residential)

Approved Substrates

• Concrete
• Plywood & OSB
• Ceramic tile
• Terrazzo
• Well-bonded vinyl & VCT
• Cement backer board
• Cement patch & self-leveling compounds
• Radiant heat systems
• Gypsum underlayments (above grade)
• Recycled rubber underlayment

Technical Highlights

• Chemistry: 1-part polymer system
• VOC Content: 0 g/L
• Open Time: up to 60 minutes
• Light Traffic: 8–12 hours
• Full Cure: 12–24 hours
• Service Temperature: −40°F to 150°F
• Elongation: >100%
• Color: Beige with black flecks

Coverage (varies by trowel)

• Engineered wood ≤ 5/8”: 30–35 sq ft per gallon
• Engineered > 5/8” or plywood: ~20 sq ft per gallon

Packaging

• 4-gallon pail

Why Contractors Choose SingleStep2™

This product replaces traditional adhesives, moisture barriers, and sound mats in one system—reducing labor, material cost, and installation time while improving long-term performance in condos, high-rises, and moisture-prone slabs.