URSA XPS extruded polystyrene products are excellent thermal insulators due their 100% closed cell structure that provides them with very low thermal conductivity and very low water absorption. This, combined with unparalleled mechanical properties in terms of compression strength and compressive creep, excellent resistance to water and freeze thaw cycles and very high resistance to moisture penetration makes the URSA XPS an excellent choice for technically challenging applications such as for flat roof, perimeter (foundations) and garden roof insulation