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FlexxBoard25

FlexxBoard 25

Construction Grade Insulating Foam Board

Learn more by accessing installation guides and manuals.

FlexxBoard25 is a rigid foam insulation board that offers enhanced performance compared to XPS (Extruded Polystyrene) boards at a more affordable price. When utilized beneath concrete, FlexxBoard25 creates a strong bond with the concrete, establishing a superior thermal barrier that effectively reduces concrete shifting and heaving.

Benefits

  • FlexxBoard25 offers many advantages at a lower cost than the competition:
    • Energy efficiency
    • Helps eliminate frost heaving and concrete cracking
    • Increases the structural integrity of concrete in both interior and exterior applications
    • Bonds to concrete and will not separate like other foam products
    • Moisture, mold and mildew resistant
    • Will not rot, deteriorate or degrade over time, sustaining its R-Value
    • Environmentally conscious formula uses a smaller portion of petroleum to make compared to other foam products
    • Made of non-toxic materials that do not off-gas like other foam products
    • Superior dimensional stability assures structure remains tight and energy efficient over life of building
    • Acts as sound deadening, quiet barrier
  • FlexxBoard25 is the perfect foam insulation board to use above or below ground:
    • Under-Slab Thermal Barrier – When used as a thermal barrier before pouring concrete, FlexxBoard25 bonds to concrete – reducing heat loss and helping to prevent possible frost heaving.  It helps extend the life of concrete driveways, sidewalks, patios, basements, shop and garage slabs, and basements.
    • In-floor Heating – FlexxBoard25 can be used as a thermal barrier beneath concrete slabs when installing radiant floor heating systems – preventing heat loss to the ground while promoting even heating.
    • Perimeter Insulation – When used around the perimeter of a poured concrete or block wall foundation, FlexxBoard25 prevents heat loss.  In shallow foundation designs, using FlexxBoard25 around the perimeter of a poured concrete slab will help prevent frost penetration and frost heaves.
    • Custom Fill Applications – FlexxBoard25 is simple to use in structural fill applications – custom shapes can be fabricated by LiteForm or be delivered in blocks and fabricated on site.
    • Roof Applications – FlexxBoard25 is an exceptional insulator and fill material for all roofing applications.

Frost Protection that Bonds to Concrete!

A picture of a broken sidewalk on one side and a fixed sidewalk on the other using FlexxBoard25.

FlexxBoard25 establishes a robust bond with concrete, enhancing the durability and strength of the insulation. This foam material is resistant to rotting or deterioration when exposed to outdoor elements.

In contrast, other colored foam boards like extruded Polystyrene are prone to detachment from concrete due to their smooth surface finish. This separation can lead to a reduction in the material's insulation effectiveness over time, potentially necessitating concrete replacement in the future.

#SaveYourConcrete

Product FlexxBoard25
Overall Dimension 48″ x 96″
Density Classification 2.0 pcf
Staple Pull out Strength 29 lbs.
Thermal Resistance (R-Value) @ 75º 2 inch = R-9
Strength Properties, minimum psi – 32.8
Compressive Strength 47
Flexural 2.0
Dimensional Stability 24.0
Oxygen Index .232
Thermal Conductivity K Factor @ 75º F
Moisture Resistance, Maximum perm./in. – 2.65
WVT (water vapor transmission % – 2.4
Absorption (vol.)
Capillarity none
Why choose FlexxBoard25 over the competition?
  • Bonds to concrete and will not separate like other foam products
  • Resistant to moisture, mold and mildew
  • Will not deteriorate or degrade over time sustaining its r-value
  • Strong! A compressive deformation psi, much higher than the others
  • Higher quality at a much lower cost (costs 15-20% less!)
  • What is FlexxBoard 25?

    FlexxBoard 25 is a high-density Expanded Polystyrene (EPS) foam board insulation designed to prevent frost heaving and cracking in concrete installations. It acts as an effective insulation barrier beneath concrete surfaces, including driveways, sidewalks, footings, and finished concrete surfaces.

  • What sizes does FlexxBoard 25 come in?

    FlexxBoard 25 is available in 4'x8' sheets that are 2 inches thick. Custom sizes are available to accommodate specific project requirements.

  • Where can I purchase FlexxBoard 25?

    FlexxBoard 25 can be purchased through select lumber dealers. Contact LiteForm Technologies for assistance in finding your nearest dealer.

  • What are the key benefits of using FlexxBoard 25?

    - Prevents frost heaving and cracking of concrete.
    - Engineered to handle the strain of high-traffic construction sites.
    - Excellent flexural stability.
    - Tested to meet ASTM standards.
    - R-value of 4.5 per inch for superior insulation performance.

  • What are common applications for FlexxBoard 25?

    It is ideal for use under concrete surfaces like driveways, sidewalks, and footings, and can also be used as insulation for finished concrete surfaces to ensure both thermal efficiency and structural protection.

  • Is FlexxBoard 25 durable enough for construction sites?

    Yes, FlexxBoard 25 is designed to endure high-traffic construction conditions while maintaining its insulating properties and stability.

  • What is the R-value of FlexxBoard 25?

    FlexxBoard 25 provides an R-value of 4.5 per inch, offering highly effective thermal insulation.

  • Can FlexxBoard 25 be customized?

    Yes, FlexxBoard 25 can be produced in custom sizes to meet the specific needs of your project.

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