Structural Construction Thermal Foam Blocks | General Plastics
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Structural Insulation Foam Blocks

LAST-A-FOAM® R-9300 Continuous Insulation Block

The R-9300 Continuous Insulation Block 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.

All LAST-A-FOAM® R-9300 blocks are sold exclusively through our distributor, CSI of Virginia, Inc. Please contact them at 804-744-0700 or email at



LAST-A-FOAM® R-9300 Continuous Insulation 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.


Our structural insulating blocks have the high-compressive strength necessary to support the load of a brick or block wall. It also reduces the thermal transfer between a building’s insulation envelope without thermal bridging at the base of the wall.


Our high-density polyurethane foam blocks maintain continuous insulation when a structural steel member penetrates the wall insulation envelope. The blocks have high compressive and shear strengths, and will not rot, decompose or promote steel corrosion.


These insulated metal panel (IMP) floor reinforcement blocks provide economical load-bearing shelving support inside cold-storage facilities while preventing thermal energy loss between the floor and ground. IMP blocks eliminate the need for other thermal protection, such as gypsum foam. We provide 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.


Our R-9300 polyurethane blocks when installed as part of the roof insulation stack or placed beneath railing supports of the roof, eliminate thermal bridging and maintain continuous roof insulation. .  These 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 the 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
  • Max use temperature of 220°F (104°C)

R-9300 Continuous Insulation Blocks

ProductsCompressive Strength psiCompressive Strength (kPa)Request a Quote
R-93203502,410Quote »
R-93255003,450Quote »
R-93301,0006,890Quote »
R-93351,50010,340Quote »
R-93401,80012,410Quote »
R-9340 HP2,10014,480Quote »


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