Home > Companies > FOAMGLAS® > 5.2 Walls - Prevention of Thermal Bridging - Foamglas (Load Bearing) Perimeter Insulation - Perinsul HL


  • Waterproof.
  • High compressive strength without deflection or movement.
  • Non-combustible.
  • Impervious to water and water vapour.
  • Sealed cellular structure.
  • Dimensionally stable.
  • Acid resistant.
  • Easily cut to shape.
  • Resistant to vermin.
  • Recycled content scrap glass: Minimum 60%.
  • Ozone Depletion Potential (ODP): <1%.
  • Global Warming Potential (GWP): Zero.
  • GreenSpec rating, see 'Cellular Glass' or 'Foamed Glass'.
  • Green Guide rating, see 'Cellular Glass'.


  • Quality: Systems with high quality materials; management by systematic site inspections and professional consulting.
  • Cost efficiency: The high durability preserves maximum value and ensures minimal maintenance costs.
  • Sustainability: Optimum insulation performance and protection against moisture for future generations. Scrap can be reclaimed and re-cycled to make new Foamglas.
  • Insulation performance: Insulation performance is permanent; ageing does not take place. Use above and below ground, unaffected by moisture, humidity and compressive loads. Proven to retain its thermal and vapour control characteristics for ˃ 50 years.
  • No thermal bridging: Fully bonded insulation systems, zero fixings prevent thermal bridging and eliminate the risk of fixings corrosion.
  • Non-toxic: Foamglas cellular glass contains no toxic substances, does not contaminate water or the ground, in cases of fire, does not develop fumes or toxic gases.
  • Sealed structure and non-hydroscopic: Each cell has a glass wall, giving the unique structural strength, vapour tight and non-hydroscopic properties.
  • A separate vapour barrier is not required: With its purpose manufactured adhesives, Foamglas is suitable for extreme humidity environments and gives control of the vapour drive in any direction. Foamglas is an insulation and vapour barrier in one single material.
  • High compressive strength: Capability to withstand high compressive loads without deflection or movement.
  • Dimensional stability: Very low rates of thermal movement, mechanical fixings are not required to prevent delamination from the parent structure.

Standard product features


  • Thermal performance is permanent and never changes.
  • Manufactured from recycled glass (minimum 60%) and natural raw materials which are available in abundant supply - sand.
  • The insulation is totally inorganic, contains no ozone depleting propellants (CFCs, HCFCs etc), flame resistant additives or binders; VOC or other volatile substances.
  • For substrate quality and suitability, see Technical Guide TG1.

- Foamglas® Perinsul HL:

  • Density (EN 1602, ± 15%): 220 kg/m³.
  • Length (EN 822, ± 2 mm): 450 mm.
  • Width (EN 822, ± 2 mm): 100, 140 or 215 mm.
  • Thermal conductivity (EN ISO 10456): ≤ 0.058 W/m·K.
  • Reaction to fire (EN 13501-1): Core material Euroclass A1.
  • Point load (EN 12430): ≤ 1.0 mm.
  • Compressive strength, mean per unit (capped with mortar (EN 772-1): ≥ 2.9 MPa.
  • Load bearing capacity (safety factor 3 applied): 800 kPa.
  • Thermal expansion coefficient (EN13471): 9 x 10-6 K.
  • Flexural modulus of elasticity (EN12089) 1500 MN/m².
  • Concrete Block Association testing to BS EN 771.
  • Impervious to water vapour (EN ISO 10456): µ=∞ infinity.
  • Green Guide rating C.
  • CEN Keymark: 001-BK-516-001-0020-T057.

NBS Specification

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This product is associated with the following NBS clauses:

Product specification

An important note about specifying





+44 (0)20 7492 1731

Product reference

5.2 Walls - Prevention of Thermal Bridging - Foamglas Perimeter Insulation - Perinsul HL

Mounting bituminous waterproofing membrane

As section J40


 - Type:

Foamglas® Perinsul HL, laid in a bed of mortar

 - Thickness:
[65 mm]
[100 mm]
[140 mm]

Manufacturer details

31-35 Kirby Street,
Hatton Garden,
London, EC1N 8TE
Tel +44 (0)20 7492 1731
Fax +44 (0)20 7492 1730
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