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Structural Insulation Foam Blocks

LAST-A-FOAM® R-9300 Construction Foam Block Insulation

The R-9300 Structural Continuous Insulation Series is a high-density rigid cellular polyurethane block designed to support structural loads while insulating buildings. Cellular polyurethane is a natural insulator and formulated in these high-density blocks, it provides the strength to support large compressive loads with little deflection. At the same time, it offers economical, code-required continuous insulation that reduces loads on cooling equipment for lower energy costs.

A wide range of compressive strengths satisfies industrial and cold-storage thermal construction applications: 350 psi, 500 psi, 1,000 psi, 1,500 psi, 1,800 psi, and 2,100 psi.

The R-9300 series extends the building insulation envelope from the roof to the foundation below ground. Even at the high densities required for support of column-bearing loads and precast/tilt-up wall panels, these structural foam blocks will provide thermal insulation value superior to lightweight concrete, treated wood blocks, and other traditional materials. They are commonly used as thermal isolation load-bearing blocks in concrete footings within refrigerated warehouse structures. As insulated structural support for roof equipment, roof perimeter fall protection and chiller tanks, they minimize both thermal transfer and condensation.

R-9300 blocks are delivered to contractors ready to use. They arrive at the job site cut-to-size, predrilled with anchor-bolt holes, and marked for fast and easy placement. This eliminates waiting for cutting or drilling before moving onto the next construction step, saving precious time.

Review a case study on General Plastics’ use of the R-9300 series for a large building project.


  • Short-circuits energy transfer to earth at foundation
  • High compressive strength supports roof-column loads
  • Creep resistant – resists distortion under load over time
  • Locks out moisture – closed-cell material does not absorb water
  • Will not rot or dissolve in subgrade applications
  • Does not promote steel corrosion
  • Does not attract or support insects or vermin
  • Does not release chemical compounds into surrounding soil
  • Compatible with grouts, adhesives and concrete
  • No lost time – products arrive at the site ready to use
  • Blocks are custom-cut, with predrilled anchor bolt holes
  • May contribute credits to LEED certification of your project
  • Blocks are marked for easy placement at the job site
  • Single-piece standard blocks – no adhesive joints, seams or banding


  • Column-Bearing Isolation
  • Perimeter Fall Protection
  • Roof Equipment Support
  • Thermal Floor Reinforcement
  • Canopy/Mansard Isolation
  • Tank Vessel Isolation
  • Tilt-Up/ Precast Panel
  • Pipe Support Standard


R-9300 Thermal Isolation Blocks

Products Compressive Strength psi Compressive Strength (kPa) Request a Quote
R-9320 350 2,410 Quote »
R-9325 500 3,450 Quote »
R-9330 1,000 6,890 Quote »
R-9335 1,500 10,340 Quote »
R-9340 1,800 12,410 Quote »
R-9340 HP 2,100 14,480 Quote »