OSI SF450+ Polyurethane High Strength Subfloor Adhesive - 28oz. (12 Tubes Per Carton)

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OSI SF450+ Polyurethane High Strength Subfloor Adhesive (Carton of 12)

PLEASE NOTE: Once ordered this product immediately goes into processing and cannot be cancelled prior to shipment.

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Manufacturer Part Number: 1943974

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Price: $131.88
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Product Information


The OSI SF450+ Polyurethane High Strength Subfloor Adhesive is a interior and exterior construction adhesive that bonds all wood to wood assemblies dry, wet, or frozen. The primary use for this adhesive is on-site bonding of subfloors and plywood decking to joists during cold weather. OSI designs the SF450 + Polyurethane for suitable subflooring, glued floor systems, tongue-and-groove flooring, standard wood construction, concrete, masonry, and wood-to-wood assemblies.


  • Tan color only
  • Ideal for use in prefab or modular construction
  • 2X strength vs. regular subfloor adhesive
  • 2x yield with 1/4" pre-cut nozzle (86 linear ft. vs. 38 linear ft.)
  • Bridges minor framing gaps
  • Adheres to wet, frozen, and treated lumber
  • Helps reduce squeaky floors
  • Cleans up with Mineral Spirits
  • Low VOC formulation meets stringent State and Federal VOC regulations
  • A 1/4” (6 mm) bead extrudes approximately 86 ft. (26 m)
  • A 3/8” (9.5 mm) bead extrudes approximately 38 ft. (12 m)


  • Open Time: 30 to 45 minutes
  • Repositioning Time: 45 minutes
  • Clamping Time: 24 hours
  • Cure Time: 24 to 48 hours

Best Results

  • Not for use on expanded or extruded polystyrene foam
  • Gaps that are greater than 0.060 inches will require a larger bead of adhesive
  • There are a wide variety of treatments for wood that can affect adhesive performance, an adhesion test is suggested prior to full application
  • Not for use on polyethylene (PE), polypropylene (PP) or flexible PVC
  • Not for use on bitumen coated surfaces
  • Not for use on tub surrounds and other solid sheet goods made from rigid polystyrene
  • Not suitable for permanent water immersion

Helpful Documents

WARNING: California's Proposition 65
Proposition 65 Warning for California Consumers

Prop 65 Warning WARNING: Cancer and Reproductive Harm www.p65warnings.ca.gov