The Hydroshield Metal Insulation Plates are used in conjunction with screws to attach insulation, cover boards, and BUR base sheets to the substrate. The Hydroshield Metal Insulation Plates' circular design and reinforcing ribs provide exceptional strength to resist wind uplift forces. The 2-inch HydroShield Insulation Plate should be used for lap seam joints. The 3-inch HydroShield Insulation plate should be used when securing insulation. The Hydroshield Metal Insulation Plates round design helps provide even weight distribution.