The document introduces a new fastener, the Top Hat to Deck Fastener SL3/2-5-S-SV16-6x27, designed to meet new thermal regulations requiring thicker roof insulation. The fastener is self-drilling, requires only one tool for installation, and has a flexible thickness range from 1.9 to 3.8 mm for steel and 4.8 mm for aluminum. It provides high torque and pull-out strength with no risk of loosening or stripping threads during installation or under dynamic loads.