Abstract: Insulation sheeting (10) comprising two outer layers (11, 12) and a closed cell structure (13) bonded therebetween. The sheeting (10) is of a thickness which allows it to be disposed in a rolled configuration and also unrolled to assume a substantially flat configuration. The outer layers (11, 12) each comprises reinforced reflective aluminium foil. The closed cell foam structure (13) comprises flexible light gauge foam such as cross-linked LDPE foam. The outer surface of one of the layers (11, 12) is treated to provide some glare reduction while retaining heat reflective characteristics. Because of the closed cell structure (13), the insulation sheeting (10) can compress under load for fixing while still affording worthwhile insulation benefits. For certain applications, the insulation sheeting (10) may be perforated for air and water vapour permeability.