NBS Source
List your products
Polyfoam Inverted Roof System

Polyfoam Inverted Roof System

Third party certifications:
  • BBA Agrément Certificate

    BBA Agrément Certificate

    Certificate type

  • QA Certificate

    QA Certificate

    Certificate type

  • BSI Kitemark

    BSI Kitemark

    Certificate type

Polyfoam XPS Ltd

Insulation system for inverted, green and blue roofs.

Jump to:
+44 (0)142 9855100 www.polyfoamxps.co.uk

An insulation system for inverted, green and blue roofs, which consists of extruded polystyrene insulation and a geotextile membrane. The membrane reduces the amount of water reaching the waterproofing layer and so improves the thermal performance of the roof.

General information
Uniclass 2015
Pr_25_71_63_29 Extruded polystyrene (XPS) boardsPrimary

J21/440 Inverted roof insulation

J31/340 Inverted roof insulation

J41/440 Inverted roof insulation

J42/440 Inverted roof insulation

Specification data - Extruded polystyrene (XPS) boards
Product Reference

Polyfoam Inverted Roof System


Insert requirements. Available in 50–245 mm.

Standard product features


Polyfoam Roofboard Extra:

  • A light-weight, rigid extruded polystyrene (XPS) board with ship-lapped edges.
  • Global Warming Potential (GWP): <5.
  • Ozone Depletion Potential (ODP): 0.
  • Compressive strength: 300 kPa.
  • Thermal conductivity: 0.033 W/m·K.

Filter membrane:

Polyfoam Slimline Zero Membrane:

  • High performance, non-woven polyethylene geo-textile membrane.
  • Water vapour permeable, but resistant to the passage of liquid water.
  • Tensile strength: (EN 12311-1): MD, 185 N/5cm; TD, 130 N/5cm.
  • Nail tear resistance (EN 12310-1): 55 N/20cm.
  • Water resistance (EN 20811): 1.5 m head of water.
  • Water vapour transmission (23°C, 85 %RH): 1200 g/m².day.

Third party certifications

Additional certifications:

  • Environmental Product Declarations
  • BES 6001: Responsible Sourcing of Construction Products
  • ISO 9001:2015 Quality Management System
  • ISO 14001:2015 Environmental Management System
  • ISO 50001 Energy Management Systems
  • OHSAS 18001 Occupational Health & Safety Management Systems
Similar products from Polyfoam XPS Ltd