Closed cell foam

Closed pore foam contains 95% closed pores filled with inert gas, which makes it strong and rigid, and will not sag over time.

In addition to its strength and ultra-light insulating properties, sealed pore foam is also completely safe - it does not emit toxic substances or volatile particles.

Closed pore foam has the best thermal performance of any insulation material available but is also significantly more expensive than open pore and hybrid foam.