Direct Fastening Technical Guide , Edition 22
Load ( kips )
Displacement [ inch ]
Figure 5 : AC43 deck diaphragm load displacement curve
Hilti power-actuated deck fasteners are recognized alternatives to arc spot puddle welds and self-drilling screws . The fasteners can be used on roof deck diaphragms as well as composite concrete filled floor diaphragms . Hilti provides training for powder-actuated tool operators in accordance with ANSI A10.3 Safety Requirements for Powder-Actuated Fastening Systems .
Hilti mechanical fastening systems provide superior solutions for attaching steel deck to steel support members
• Consistent fastening quality
• High production rate
• No burn throughs or joist damage from welding
• Superior cyclic load performance and system ductility
3.5.1.2.3 Proper fastener selection and steel deck layout ( pre-fastener installation )
Selection of the proper Hilti deck fastener depends on the supporting base steel thickness as shown in Section 3.5.1.3.1 . The Hilti Deck Fastener Selection Gauge shown in Figure 6 should be used by the decking installer to confirm fastener selection . The cut-out slot on the gauge is fit against the bar joist top chord or steel beam flange . As the internal card slides in the gauge , the proper Hilti deck fastener is highlighted with a green box . A red box indicates that the corresponding Hilti deck fastener is outside the base material application limits and should not be used for steel deck fastening to the base material being gauged . Note that because of wide variations in base material hardness , on-site test installation is always required .
Rolled beam or wide flange shape
≥ 3 / 8 " t ||
Angles or joist top chords
b x
≤ 8 t || Figure 7 : Edge distance recommendations
Extra care must be taken at the endlap and corner lap conditions where multiple layers of steel deck nest or interlock on adjacent panels . It is particularly important that endlap and corner lap conditions of two and four deck layers must be snug and tight against one another and the supporting steel frame in order for a proper fastening to be made as shown in Figure 8 . Tight endlap and corner lap requirements are independent of the fastening type and contribute directly to the performance of arc spot welds , screws , power-actuated fasteners , punches and crimps / clinches . If the steel deck endlaps and corner laps are not tight , a proper fastening cannot be made . b x
≥ 3 / 8 " t ||
Figure 6 : Hilti Deck Fastener Selection Gauge
Steel deck installers must layout deck properly and mark frame fastening lines in order to ensure that steel deck panels are connected to the supporting steel frame . Marking frame fastening lines is essential , especially when attaching steel deck to thin base steels ( t II
< 1 / 4 "), including open web steel joists . For all applications , the fasteners should be installed at least 3 / 8 " ( 10 mm ) from the edge or toe of the joist top chord or light steel beam flange . Additionally , when installing into a bar joist top chord ( angle ), the fasteners need to be installed at a distance from the angle , b x
≤ 8 x t II . Reference Figure 7 for edge distance and b x dimensions .
Figure 8 : Tight nesting of steel deck sheets
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