The InsulFloorBoard system consists of OSB panels (agglomerated particleboard) laminated to an insulating panel of high-density expanded polystyrene to let cement breathe. The polystyrene has drainage slits. Each panel includes an iLock joint, which consists of a unique dual joint system featuring tongue and groove, preventing moisture from altering the integrity of the wood. The two "Flex-Grooves" grooves provide the panel with the flexibility to easily compensate for uneven slabs of concrete. These multifunctional panels must be installed fixed for all floor covering surfaces. For a floating floor, they can be glued to the joints with carpentry glue. Each box contains 4 panels and covers 20.5 sq. ft.