recent field experience with steel deck installations decking.pdfmicrosoft powerpoint - steel...
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![Page 1: Recent Field Experience with Steel Deck Installations Decking.pdfMicrosoft PowerPoint - Steel Decking.ppt Author Gerry Created Date 12/10/2004 7:53:02 PM](https://reader031.vdocument.in/reader031/viewer/2022030621/5ae81c677f8b9a9e5d900fa8/html5/thumbnails/1.jpg)
Recent Field Experiencewith Steel Deck
Installations
![Page 2: Recent Field Experience with Steel Deck Installations Decking.pdfMicrosoft PowerPoint - Steel Decking.ppt Author Gerry Created Date 12/10/2004 7:53:02 PM](https://reader031.vdocument.in/reader031/viewer/2022030621/5ae81c677f8b9a9e5d900fa8/html5/thumbnails/2.jpg)
Alternatives for Steel DeckFastening
1. Side Seam Connections•Button punching•Self-tapping screws•Welded side seams
2. Frame Attachments•Standard puddle welds•Welds with washers•Powder actuated drive pins•Self-tapping screws
![Page 3: Recent Field Experience with Steel Deck Installations Decking.pdfMicrosoft PowerPoint - Steel Decking.ppt Author Gerry Created Date 12/10/2004 7:53:02 PM](https://reader031.vdocument.in/reader031/viewer/2022030621/5ae81c677f8b9a9e5d900fa8/html5/thumbnails/3.jpg)
Deck Profile with Lapped Side Seam
Deck Profile with Nested Side Seam
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Screwed Side Seam
•Lapped side seam or “Cladding lap” with self-tapping screws
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Standard Puddle Welds to Frame
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Weld with Washer
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Powder Actuated Drive Pins
![Page 8: Recent Field Experience with Steel Deck Installations Decking.pdfMicrosoft PowerPoint - Steel Decking.ppt Author Gerry Created Date 12/10/2004 7:53:02 PM](https://reader031.vdocument.in/reader031/viewer/2022030621/5ae81c677f8b9a9e5d900fa8/html5/thumbnails/8.jpg)
Drive Pins at Perimeter Angle
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Self-Tapping Screws
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Field Observations
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Side Seam Screws•#12-14 x 1” long self-tapping screws
with #1 drill point
•.212” thread diameter with .150” shaft and 0.40” integral washer
•Typical purchase cost–about 5 centseach
•Screwed side seams almost as fast asbutton punching
•Standup tools are easier on workerand speed up installation
•Standup tool cannot accommodatescrews larger than #12 or screws withadditional washers
•Screw fasteners easy to inspect withlow rejection rate
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Installing SideSeam Screws
with Hand Tool
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Standup Toolfor Side Seam
Screws
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Frame Connections
![Page 15: Recent Field Experience with Steel Deck Installations Decking.pdfMicrosoft PowerPoint - Steel Decking.ppt Author Gerry Created Date 12/10/2004 7:53:02 PM](https://reader031.vdocument.in/reader031/viewer/2022030621/5ae81c677f8b9a9e5d900fa8/html5/thumbnails/15.jpg)
Welds with Washers•1.375” x 3/32” washer with 9/16” hole
•Weld completely fills hole•Material cost, 5 cents each•Good clamping action from
washer•Increased installation time
over standard welding•Difficult to weld with multiple
layers of deck•Difficult to locate on top of
narrow joist chords•Easy to inspect
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Hilti Pins for Frame Attachments•Hilti X-EDN19 or X-EDNK22•0.21” shank with 0.50” collar•Applicable for framethickness of 0.125” to .375”
•45 cents material cost per pin•Installed with standup tool
using continuous feed•Faster than standard welding
by almost 2 times•Independent of weather
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Deck Fastening Patterns
36/11 Pattern
36/9 Pattern
36/7 Pattern
36/4 Pattern
1.5
36
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Standup Tool for Drive Pins
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Drive Pin Depth Gauge
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Hilti Pins for Frame Attachments•Special care required for decking layout and
marking underlying joists•Rebound problems with lighter gauge material•Adjustments to driving power required for various
thicknesses of base metal•Small diameter head•Cannot be used with separate washer•Overdriving can result in deck metal fracture•Difficult to inspect and higher rejection rate•Problems with unskilled installers
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Drive Pin Problems
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Screwed Frame Attachments•#12-14 x 1” long screw with #3 drill
point•.212” thread diameter with .150” shaft and 0.40” integral washer
•Available with 0.60” washer•Applicable for .125” to .210” base
metal thickness•Suitable for cold rolled joist chords
and thinner gauge hot rolled chords•5 cents material cost per screw•Can be installed with standup tools
but not with washer•Slower than drive pins to install•Easy to inspect
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Self-Tapping Screws forFrame Attachments
•#12-24 Screw with #5 point for basemetal thickness of .250” or more
•Machined drill point•May require pre-drilling•Can be used with separate washer•40 cents per screw•Suitable for connections to beam flanges,
drag struts and perimeter chord angles•Much slower than drive pins
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Installation Costs ComparisonsBased on 1.5”x 22 gauge (.030”) standard roofdecking. Same number of fasteners in all cases.
Cost Factor1. Standard welds to frame and 1.00
button punched side seams2. Standard welds and screwed side seams 1.053. Weld washers and screwed side seams 1.194. Hilti pins and screwed side seams 1.135. Hilti pins to perimeter angles, drag struts 1.14
• Screwed joists and screwed side seams5. Screws to all frame members and 1.17side seams
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End of Presentation