The invention relates to a system of fastening sheet material cladding onto substrates with hammer driven fasteners. The fasteners are cylindrical and have a first diameter at a tip end which is larger than a second diameter at a head end. When the fastener is driven through sheet material a hole is produced which is larger in diameter than the portion of the fastener adjacent the head. The sheet material is free to move laterally relative to the fastener because of the oversized hole that is produced by the oversized tip of the fastener. Additionally, deformation or dimpling is avoided because the small-diameter portion of the fastener does not produce axial frictional forces on the sheet material as it passes through the sheet material.