Insulation

XPS Insulation.

XPS is the most climatically damaging insulation material. Use XPS only where technically unavoidable, and always specify HFC-free variants.

Key Figures

Carbon Footprint (GWP): 4.16 kg CO₂-eq/kg
Density: 28–45 kg/m³
Expected Lifespan: 50+ år

What is xps insulation?

XPS (Extruded Polystyrene) is a dense, moisture-resistant insulation with high compressive strength. Used primarily for plinths, flat roofs, terraces, and other structures with direct moisture exposure. It has the highest carbon footprint among common insulation materials and in many cases uses HFC blowing agents that are potent greenhouse gases.

Carbon Footprint Compared

Perlite ← this material 0.48 kg CO₂/kg

Mineral wool 1.05 kg CO₂/kg

EPS 3.29 kg CO₂/kg

XPS 4.16 kg CO₂/kg

Negative carbon footprint (green) indicates carbon storage. Data based on EPD averages from ECO Platform and estimates per EN 15804.

Typical Applications

check_circle Plinth and foundation
check_circle Flat roofs (inverted)
check_circle Roof terraces
check_circle Cold storage buildings
check_circle Walkways and parking decks

In Renovation

XPS is used in renovation primarily for retrofitting insulation on plinths and flat roof edges. Always specify CO₂ blowing agent version to minimise climate impact.

Questions about xps insulation

Why is XPS carbon footprint so high?

Many XPS products use HFC or HCFC blowing agents during production. HFC gases are up to 1,000–14,000 times more potent greenhouse gases than CO₂. Newer XPS products using CO₂ as blowing agent have markedly lower footprints.

Are there alternatives to XPS for plinths?

Perlite and cellular glass (Foamglas) are alternatives with lower CO₂ and good moisture tolerance for plinths. Mineral wool with diffusion-tight membrane can be used in some locations.

Can XPS be replaced with EPS?

In moisture-exposed structures (inverted roof constructions, below-grade plinths) XPS is difficult to replace with EPS, as EPS absorbs moisture and loses insulating capacity. In dry structures EPS can often be used.

When is XPS necessary?

XPS is necessary in load-bearing and moisture-exposed structures: below-grade plinths, inverted roof constructions, and parking decks. In these situations there is no easy substitute.

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