Drew Expanded Polystyrene Insulation & Flotation EFS is & rises, lightweight, foamed plastic which has density range between 1.0 ang 30 pet for most construction applications. Within that age, EPS san be molded to achieve varying densities, providing the mix of strength and insulating ‘properties lo meet specific application requirements at minimum cost EPS has a substantial thirty-year History a efficient use in constriction for industrial, commercial, resident anc temperature buildings.