GenFast #14 Fasteners are heat treated steel fasteners coated with a proprietary gray coating that increases the products corrosion resistance. Installation of the GenFast #14 Fastener into steel, wood, and structural concrete (into steel deck) substrates is acceptable. This multipurpose roofing fastener can be used in a variety of GenFlex roofing systems for the attachment of GenFlex insulation or membrane provided the fastener is used in combination with the appropriate GenFlex insulation or seam plate.