Insulation beneath the building must do more than insulate – it must withstand permanent structural loads without compromise. 

When insulation lacks sufficient compressive strength, deformation or settlement can occur – redistributing forces, cracking floor slabs, and compromising structural integrity. While selecting a material with a high declared strength may seem sufficient, not all insulation materials behave the same under load. 

Unlike FOAMGLAS® cellular glass, which is tested under sustained pressure conditions (EN 826 Annex A), conventional materials often exhibit long-term deformation (EN 826). EN 1606 testing provides additional data on the long-term behaviour of FOAMGLAS® insulation to determine load deformation.

With its proven compressive strength and dimensional stability, FOAMGLAS® insulation supports long-term structural integrity – where insulation cannot be replaced once installed.

Explore the structural advantage in our Below Ground White Paper – where insulation must remain stable under pressure, moisture, and time.