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XPS Insulation Board

Extruded polystyrene closed-cell insulation board for high-load thermal insulation in inverted roofs and below-grade applications.

Closed-CellHigh Load BearingMoisture ResistantInverted Roof
LAMBDA0.029–0.036 W/mK
THICKNESS30–150 mm
STRENGTH≥ 300 kPa
SHELF LIFEUnlimited
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↓ Download Datasheet (PDF)

Overview

Closed-cell insulation. Bears the load. Resists moisture.

XPS Insulation Board is an extruded polystyrene closed-cell rigid insulation board for thermal insulation in inverted roof systems, below-grade walls, and other applications requiring high compressive strength combined with moisture resistance.

The standard insulation for inverted (protected membrane) roof systems where the insulation sits above the waterproofing membrane.

Key Features

  • Closed-cell extruded polystyrene
  • High compressive strength (≥ 300 kPa)
  • Very low water absorption (< 0.5%)
  • Lambda value 0.029–0.036 W/mK
  • Tongue-and-groove edge for thermal continuity
  • Suitable for inverted roofs and below-grade

Technical Specs

Technical Specifications

All values measured at 23°C unless noted. Full test data available in the datasheet.

PropertyValueUnit
FormExtruded closed-cell rigid board–
CompositionExtruded polystyrene (XPS)–
ColourStandard blue or pink–
Density32–40kg/m³
Thermal conductivity (λ)0.029–0.036W/mK
Thickness options30 / 50 / 80 / 100 / 120 / 150mm
Board dimensions1200 × 600mm
Edge profileSquare / Tongue-and-groove–
Compressive strength≥ 300kPa
Water absorption (28d)< 0.5%
Service temperature−50 to +75°C
Fire ratingClass E (LSF available)–
PackagingPlastic-wrapped bundles–
StandardsEN 13164 · ASTM C578–

Applications

Where this product is used

Five typical site applications where our crews specify this product.

🏢

Inverted roofs

Insulation above waterproofing in protected roof systems.

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Foundation insulation

Foundation and slab edge insulation.

🌡️

Cold storage

Cold room and freezer floor insulation.

🅿️

Car park decks

Insulated podium and car park slabs.

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Floor insulation

Under-slab and screed insulation.

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