IsoBoard can be used to thermally insulate many existing buildings which require upgrading with respect to comfort levels or energy efficiency. IsoBoard is suitable to be installed as a ceiling, either beneath an existing ceiling, or between trusses or rafters. IsoBoard can be used externally to insulate flat concrete roofs in the inverted roof application, as spandrels or EFIS panels (Exterior Façade Insulation Systems), or to insulate foundation perimeters in the absence of under-slab insulation.