TRUFAST Metal Seam Plates are used to mechanically attach single-ply and modified bituminous roof membranes to the substrate. The plate's circular design and reinforcing ribs provide exceptional strength to resist wind uplift forces. TRUFAST Metal Seam Plates are made for excellent corrosion protection. TRUFAST TL Seam Plate is used to attach reinforced single-ply and modified bituminous membranes to cementitious wood fiber, gypsum and lightweight concrete substrates. Use with TRUFAST TL Roofing Fastener.