3.3.3 - Soffit with Foamglas Insulation and Plaster Finish

3.3.3 - Soffit with Foamglas Insulation and Plaster Finish

FOAMGLAS® Third party certifications:
  • BSI Kitemark

    BSI Kitemark

    Certificate type

  • QA Certificate

    QA Certificate

    Certificate type

Soffit insulation with finishing plaster.  

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  • 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, unique hidden anchor bracket fixings prevent thermal bridging.
  • 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.

General information

Uniclass 2015

Pr_25_71_52_13 Cellular glass insulation boardsPrimary


K10/220 Proprietary suspended ceiling system

Specification data - Cellular glass insulation boards

Product Reference

3.3.3 Soffit with Foamglas Insulation and Plaster Finish



Mechanical fasteners

PC® F anchors




Foamglas® Slab (T4+)


40 mm

50 mm

60 mm

70 mm

80 mm

90 mm

100 mm

110 mm

120 mm

130 mm

140 mm

150 mm

160 mm

170 mm

180 mm



Finishing plaster

Knauf MP 75 L

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® Slab (T4+):

  • Density (EN 1602, ± 10%): 115 kg/m³.
  • Length (EN 822, ± 5 mm): 600 mm
  • Width (EN 822, ± 2 mm): 450 mm.
  • Thermal conductivity (EN ISO 10456): ≤ 0.041 W/m·K.
  • Reaction to fire (EN 13501-1): Euroclass A1.
  • Compressive strength (EN 826 annexe A): ≥ 600 kPa.
  • Flexural modulus of elasticity (EN12089): 700 MN/m².
  • Bending strength (EN 12089): ≥ 450 kPa.
  • Tensile strength (EN 1607): ≥ 100 kPa.
  • Thermal expansion coefficient (EN13471): 9 x 10-6 K.
  • Impervious to water vapour (EN ISO 10456): µ=∞ infinity.
  • Green Guide rating A.
  • CEN Keymark: 001-BK-516-001-0026-T00A.
  • CPR DOP: 100010015.

Product Options


- Thickness:

Where required for thickness >180 mm, use double layers of minimum 90 mm per layer. Where required for thickness >160 mm, use double layers of minimum 80 mm per layer.

Digital objects

Platform Compatible Version Certified to




Revit 2016


Download now from NBS National BIM Library


Third party certifications

  • Foamglas Insulation: File BM730-585 certificate 0603. : Manufactured to Environmental Management System ISO14001
  • Alliance for Sustainable Building Products: Foamglas Insulation Nature Plus certificate number 0406-1101-101-1. : Nature Plus recognised and approved

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