The Polymer Fasteners are to be used in conjunction with Polymer Insulation Plates for the attachment of insulation, base sheets, and selected roof system components into cementitious wood fiber or gypsum decks. The Polymer Fastener Metal Batten Strip or Polymer Fastener Metal Seam Plates must be used when attaching membrane. Seam Plates, Batten Strips, and Insulation Plates offer an anti-backout mechanism. When properly engaged, tabs on the underside of the Polymer Fastener open and lock against the teeth around the hole, thus locking the fastener to the plate or batten resisting back-out. This fastener is not intended to be used for in-seam attachment of single-ply membrane.