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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.



LAST-A-FOAM® R-9300 Thermal Column-Bearing Blocks are designed to support heavy and structural loads while maintaining thermal control within industrial building interiors. Made of proven, high-density rigid cellular polyurethane material, these construction thermal blocks are ideal for cold-storage facilities. They combine high compressive strength with little deflection and extraordinary thermal insulation.


These concave insulating blocks securely support chiller equipment outside cold-storage facilities. They prevent thermal energy transfer through the concrete between the tank and earth below.


Our high-density polyurethane foam blocks provide a thermal barrier for metal canopy or mansard supports where they are anchored to building exterior walls.


These thermal blocks provide economical load-bearing shelving support inside cold-storage facilities while preventing thermal energy loss between the floor and ground. This stable polyurethane stock material eliminates the need for other thermal protection, such as gypsum foam. General Plastics provides blocks to your specified dimensions.


Placed on top of the building’s roof, these insulating blocks support HVAC and other heavy equipment while preventing radiant heat transfer to the building’s interior. This added insulation keeps the building interior cooler and reduces the load on cooling equipment, lowering utility costs.


These sturdy blocks are a key component of a commercial or industrial roof safety system. Our R-9300 Series polyurethane blocks are custom-cut with pre-drilled anchor-bolt holes for securing to the surface of existing roof structures. The high-density material provides greater load-bearing ability and durability than wood while preventing cold air from escaping through concrete supports for perimeter posts.


Our R-9300 Series prevents thermal energy transfer between the building and ground when installed under precast and tilt-up concrete walls. Because these insulating construction thermal blocks offer excellent load-bearing ability and durability, only a few are required to support each wall. This eliminates wasted material while preventing costly energy loss.



  • Short-circuits energy transfer to earth at the 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 pre-drilled 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

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 »


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