Products | Construction | Softwood Plywood

RigidFloor Underlayment

Overview Specifications

Roseburg RigidFloor UnderlaymentRoseburg Plywood underlayment is produced using thin layers of wood called veneers that are peeled from a western softwood tree log and glued together to form one multi-layered wood panel. This process creates a very strong plywood underlayment that is engineered to be a durable protective covering and can be applied directly over the floor joist framing of a building. Roseburg Plywood underlayment delivers outstanding stiffness: strength and versatility.


  • Nails directly over floor joist in 19/32" or thicker panels.
  • Framing applications where state and/or local building codes require greater construction for extra strength.
  • Where additional insulation is desired.

Key Advantages

  • APA — The Engineered Wood Association
  • PS 1
  • Cross-laminated veneer construction provides superior dimensional stability (resistance to warping). 
  • Tongue and groove on 2 edges


Storage in a warehouse or under roof is recommended prior to use. If stored outdoors, units should be off the ground and covered loosely with some type of protective material.

Machining & Fasting

Can be cut, drilled, routed, glued, fastened and finished with ordinary tools. Excellent nail, screw, and staple holding ability allows placement near panel edges without splits. Always use sharp, high-speed tools. Because of the cross-layer construction, nails, screws, and other fasteners may be placed near the panel edge without splitting the panel. Roseburg underlayment should be securely fastened with 6d nails on 1/4", 3/8", 1/2" panels and with 8d nails on 5/8", 3/4" and 1" panels. Space nails 6" o.c. around all panel edges and 12" o.c. on intermediate supports. For soffit applications, all panel edges should be supported. Nails should penetrate at least one inch into the substrate material. Leave 1/8" gap between panel edges. Spiral or ring shank nails offer the best holding power. Screws and bolts can also be used.

  • Rigidfloor UnderlaymentLengths: 8’, 9', 10'
  • Widths: 4’ 
  • Thicknesses: 11/32’’- 1-1/8"
  • Grades: APA – PS 1 standards
  • Face: Western softwood (typically Douglas fir) veneer 
  • Core substrate: Multi-layers of thin wood (veneer) in alternating wood grain directions, which increases the strength and stiffness of this finished panel.
  • Back: Douglas fir or white wood veneer that provides excellent strength and durability and balances the panel to reduce warping.
  • Adhesive: NAUF exterior, fully water resistant phenolic glue

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