PlastiSpan Insulation is a moulded expanded polystyrene (EPS) insulation.

EPS is a closed cell, rigid foam plastic insulation that does not contain a
blowing agent that provides a temporary increase in thermal resistance.

Plastispan insulation applied as continuous insulation over foundations,
walls and roofs eliminates thermal bridging, increasing your total effective
RSI/R-value. This reduces energy costs and increases your energy savings