The Firestone Heavy Duty Fastener is specifically designed to be used in roofing applications which require additional corrosion protection and additional pullout resistance. It may be used for attachment of roofing insulation and base sheets in combination with Firestone Insulation Plates, or for attachment of Firestone Batten Strips, Termination Bars, Seam Plates and other accessories to wood, steel, concrete and other decks where approved by Firestone Technical Specifications.