Nestable sidelap - Steel deck type in which the side edge of a steel deck panel contains a partial valley profile and overlaps , or “ nests " on top of the side edge of the adjacent steel deck panel , which contains a full valley profile . Often fastened together using self-drilling stitch screws .
Non-diaphragm deck - A steel deck system which is designed to carry only gravity loads .
Powder-actuated cartridge - A powder filled metal casing used as the source of driving energy in a powder-actuated tool . The ANSI A10.3 terminology for Hilti powder loads is a “ cased powder load .”
Powder-actuated fastener ( PAF ) - A nail or threaded stud fastener capable of being driven into steel , concrete or masonry . Fasteners may be equipped with washers suitable for clamping the fastened material to the base or supporting material . Also referred to as Hilti DX , powder-actuated fasteners , power-driven fasteners ( PDF ), drive pins or shot pins .
Low velocity powder-actuated tool - A powder-actuated tool in which the expanding gas of the powder load acts on a captive piston , which in turn drives the fastener into the base material . If the average test velocity of the lightest fastener when using the strongest powder load does not exceed 328 fps ( 100 m / s ), the tool meets the ANSI A10.3 requirements and is classified as a low-velocity tool . All Hilti powderactuated tools used in the construction industry are classified as low-velocity .
Pullover - As related to fasteners , a failure mode that occurs when the steel deck panel pulls over the fastener head or washer ( s ).
Punch systems - A mechanical means of connecting two pieces of sheet metal together by punching through the steel to create a flap of metal which is then crimped . This is done with a proprietary pneumatic tool on interlocking deck panels .
Purlin - A secondary horizontal structural member attached to the primary frame and supporting the roof covering .
Sidelap - The side edge overlap of adjacent steel deck panels ( side edges parallel to the steel deck panel fluting ).
Stitch screws - Screws used to fasten the overlapping edges of two deck panels between joists or beams .
Tack weld - A weld of no structural significance . Used for temporary attachment of steel to the supporting frame . A weld made to hold the parts in proper alignment until the final welds are made .
Uplift - Vertical load on the steel deck panels due to wind forces .
Wind tacking - Limited fastening of the steel deck panel at the edges to hold the panels in place until all specified fastenings have been made .
Profis DF Diaphragm Software - Hilti developed , revolutionary design and submittal generator program . It incorporates a powerful design optimization feature to produce cost-effective and reliable steel deck solutions .
Pullout - As related to fasteners , a failure mode that occurs when the fastener pulls out of the base steel support .
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