StyroRoof ® XPS Insulation

XPS Insulation for Green Roofs and Rooftop Applications
StyroRoof ® XPS Insulation
Foamex StyroRoof XPS membrane for Green Roofs
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StyroRoof® by Foamex is a high-performance extruded polystyrene (XPS) insulation board engineered specifically for green roofs and rooftop applications. Manufactured in Australia from Styroboard XPS—the only locally made XPS—StyroRoof offers excellent compressive strength, long-term thermal performance, and superior moisture resistance, making it ideal for demanding rooftop environments.

Its closed-cell structure ensures dimensional stability and low water absorption, even when exposed to wet and fluctuating conditions over time. StyroRoof® supports energy-efficient building design by reducing heat transfer through the roof, contributing to better energy ratings and reduced HVAC loads. With up to 90% recycled content, a lightweight profile, and full recyclability, StyroRoof delivers both environmental and structural performance in green infrastructure and commercial roofing systems.

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Benefits of StyroRoof ®

  • Purpose-built for green roofs and rooftop insulation systems
  • High compressive strength to support overburden and landscaping layers
  • Closed-cell XPS structure is highly resistant to moisture absorption
  • Long-term retained R-values, even in extreme rooftop conditions
  • Lightweight, easy to handle, cut and install
  • Manufactured in Australia from Styroboard® XPS
  • Contains up to 90% recycled polystyrene content
  • Offcuts fully recyclable through Foamex’s national take-back program
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StyroTherm XPS Sheets Sizing

StyroRoof ® Product Details

StyroRoof ® Technical Summary
Thickness (mm) R-Value K-Value (λ) Compressive Stress 2% (kPa) Compressive Stress 10% (kPa)
25
0.81
0.031
>60
>150
30
0.94
0.031
>90
>200
40
1.29
0.031
>150
>220
50
1.55
0.033
>230
>250
60
1.82
0.033
>240
>250
70
2.15
0.034
>280
>350

XPS Sheet Length is 2400mm. Thermal test method – AS-4859.1 / ASTM C518; Compression test method – AS-2498.3 / ASTM D1621

StyroTherm XPS Sheet Sizing
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FAQ's

Frequently Asked Questions About StyroRoof® XPS Sheets

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What makes StyroRoof ® ideal for green roofs?
StyroRoof® combines high compressive strength with excellent moisture resistance, so it can support soil, plants, pavers or ballast layers without losing its thermal performance over time.
Typically, you’d waterproof the structural deck, lay StyroRoof® boards directly over the membrane, then add a root barrier, drainage layer, growing medium and vegetation on top.
Closed-cell XPS resists water uptake and freeze-thaw damage, ensuring long-term R-values and structural stability—even under constant outdoor exposure.
Yes. It’s manufactured in Australia from Styroboard® XPS with up to 90% recycled EPS, contains no CFCs or HCFCs, and any offcuts can be returned to Foamex for recycling when your project is complete.
By reducing heat flow through the roof, StyroRoof® lowers cooling loads in summer and heating demand in winter—supporting better energy ratings and more comfortable interiors.

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