Abstract: Insulation board for attachment mechanically to the exterior or interior walls of buildings and the like. The insulation board is composed of at least one panel of insulation material provided with a plurality of spaced, transversely extending holes for reception of fasteners for attaching the board to a building wall. Disposed coaxially within each hole is a flanged sleeve through which fasteners, such as screws, nails, welding studs or the like are inserted for securing the board in tight abutting relation to the surface of the wall. The fasteners are provided with heads which engage the flanged ends of the hollow sleeves, and have their opposite ends protruding from one surface of the insulation board for penetration into, and securement to, the wall.