VERCO® ROOF DECK TECHNICAL GUIDELINES
Verco Decking, Inc. is noted for its innovative development of steel roof decks including the use of mechanical sidelap connections (the PunchLok Systems) and shear restraining elements (the ShearTranz Systems). In this catalog, Verco features a complete range of systems utilizing the PunchLok II System for sidelap connections: 1½” deep PLB-36, 3″ deep PLN3-32 and 3″ deep PLN-24 with welds and mechanical fasteners (power actuated fasteners and screws) to the supports. With the PunchLok II System, Verco continues its industry leading history of improvement and innovation to serve theconstruction community.
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Index |
Section |
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Profile Designations |
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Material |
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Roof Deck Vertical Loads |
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Roof Deck Diaphragms |
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Attachment of Roof Deck |
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1 – Profile Designations
1.1 – PLB-36 and HSB®-36
ASD data sheetsLRFD data sheets
PLB™-36 and HSB®-36
1.5″ Deep, 36″ Wide
ASD data sheetsLRFD data sheets
PLB™-36 AC and HSB®-36 AC
1.5″ Deep, 36″ Wide
Web Perforated
ASD data sheetsLRFD data sheets
PLB™-36 FP-11 and HSB®-36 FP-11
1.5″ Deep, 36″ Wide
Fully Perforated – Aprox. 11% Open Area
ASD data sheetsLRFD data sheets
PLB™-36 FP-21 and HSB®-36 FP-21
1.5″ Deep, 36″ Wide
Fully Perforated – Aprox. 21% Open Area
ASD data sheetsLRFD data sheets
PLB™-CD and HSB®-CD
1.5″ Deep, 36″ Wide
ASD data sheetsLRFD data sheets
PLB™-CD AC and HSB®-CD AC
1.5″ Deep, 36″ Wide
Bottom Pan Perforated
1.2 – PLN3™-32 and HSN3™-32
ASD data sheetsLRFD data sheets
PLN3™-32 and HSN3™-32
3″ Deep, 32″ Wide
ASD data sheetsLRFD data sheets
PLN3™-32 AC and HSN3™-32 AC
3″ Deep, 32″ Wide
Web Perforated
ASD data sheetsLRFD data sheets
PLN3™-32 AC FP-11 and HSN3™-32 FP-11
11/2″ Deep, 36″ Wide
Fully Perforated – Aprox. 11% Open Area
ASD data sheetsLRFD data sheets
PLN3™-32 AC FP-21 and HSN3™-32 FP-21
11/2″ Deep, 36″ Wide
Fully Perforated – Aprox. 21% Open Area
ASD data sheetsLRFD data sheets
PLN3™-CD and HSN3™-CD
3″ Deep, 32″ Wide
ASD data sheetsLRFD data sheets
PLN3™-CD AC and HSN3™-CD AC
3″ Deep, 32″ Wide
Bottom Pan Perforated
1.3 – PLN™-24 and N-24
ASD data sheetsLRFD data sheets
PLN™-24 and N-24
3″ Deep, 24″ Wide
ASD data sheetsLRFD data sheets
PLN™-24 AC and N-24 AC
3″ Deep, 24″ Wide
Web Perforated
ASD data sheetsLRFD data sheets
PLN™-24 AC FP-11 and N-24 FP-11
3″ Deep, 36″ Wide
Fully Perforated – Aprox. 11% Open Area
ASD data sheetsLRFD data sheets
PLN™-24 AC FP-21 and N-24 FP-21
3″ Deep, 36″ Wide
Fully Perforated – Aprox. 21% Open Area
ASD data sheetsLRFD data sheets
PLN™-24-CD and N-24-CD
3″ Deep, 24″ Wide
ASD data sheetsLRFD data sheets
PLN™-24-CD AC and N-24-CD AC
3″ Deep, 24″ Wide
Bottom Pan Perforated
1.4 – 2.0D Dovetail Deck
ASD data sheetsLRFD data sheets
2.0D Roof
2” Deep 24” Wide
Dovetail
ASD data sheetsLRFD data sheets
2.0D AC Roof
2” Deep 24” Wide
Dovetail – Bottom Flute Perforated
1.5 – 3.5D Dovetail Deck
ASD data sheetsLRFD data sheets
3.5D Roof
3.5” Deep 24.5” Wide
Dovetail
ASD data sheetsLRFD data sheets
3.5D AC Roof
3.5” Deep 24.5” Wide
Dovetail – Bottom Flute Perforated
VERCOR™
ASD data sheetsLRFD data sheets
Shallow VERCOR™
9/16″ Deep, 36″ Wide
ASD data sheetsLRFD data sheets
Deep VERCOR™
15/16″ Deep, 36″ Wide
Material
Galvanized fluted roof deck panels are formed from either ASTM A 653 or A 1063 steel. Painted/painted or mill finished fluted roof deck panels are formed from either ASTM A 1008 or A 1039 steel.
Cellular roof deck sections are fabricated from galvanized steel conforming to ASTM A653 or A 1063. The fluted top and flat bottom sections are factory resistance-welded together.
Note: Weld marks will be visible on the exposed flat bottom.
Deep and Shallow VERCOR decks are fabricated from G90 galvanized steel conforming to ASTM A 653 or A 1063.
Uniform Load Tables
Allowable uniform load values are based on the allowable bending moment (stress) and limiting deflection to L/360, L/240 or L/180. Allowable uniform load values for cellular deck panels are also governed by the allowable vertical shear (governed by the horizontal shear strength of the resistance welds between the fluted top section and the flat bottom section). The symbol – in the Verco Design tools indicates that the allowable uniform load based on deflection exceeds the allowable load based on flexure (stress) or vertical shear (shear). Note that self-weight of the deck should be included when determining dead load.
The formulas used to determine the allowable uniform loads due to flexure (stress), shear and deflection are as follows:
Design Formulas
+M = Positive Bending Moment in ft-lb
–M = Negative Bending Moment in ft-lb
Δ = Deflection in inches
E = 29,500,000 psi
w = Allowable uniform live load in psf
L = Span length in feet. Span lengths shown in tables are centerto-
center spans.
Re = End reaction in lb/ft
Ri = Interior reaction in lb/ft
Ve = Vertical Shear adjacent to end support
Vi = Vertical Shear adjacent to interior support
Bearing
Verco recommends 2 inches minimum bearing on perpendicular supports. The required bearing should be verified based on specific load and span conditions. Adequate bearing at perpendicular supports is required to prevent web crippling of the deck and to allow for proper attachment. Sufficient bearing at parallel supports should be provided to make the specified connections.
The allowable reactions as well as allowable concentrated line loads based on web crippling (one and two flange loading) are shown in the section properties tables that follow in this catalog.
The following illustration (Figure 1) illustrates the difference between one flange and two flange loading for web crippling.
Suspended Loads
The engineer of record should evaluate suspended or hanging loads attached directly to the roof deck on the basis of the project conditions. The specific method of attachment will determine the load distribution or effective width of deck to be used in the evaluation. Verco offers web based design tools to assist with this, you can find them at: www.vercodeck.com -> Design Tools -> Roof Deck Design Tools -> Steel Deck Roving Loads
Concentrated Loads
Concentrated loads, such as those due to construction or maintenance workers, should be evaluated based on the deck section properties, material strengths, and web crippling capacities.
Cantilevered Deck
The length of Verco roof deck cantilevers can be determined based on section properties and material strengths. Consider construction or maintenance workers and materials attached to the deck, particularly with regard to deflection. Attach cantilevers to supports prior to loading. See Figure 2.
Wind Uplift
Determine allowable spans to resist uplift forces based on the deck section properties and material strengths. Evaluation may be warranted on specific projects.
Allowable tension strengths of arc spot welds and #12 screws are determined in accordance with AISI’s “S100: North American Specification for the Design of Cold-Formed Steel Structural Members.” (AISI S100).
Allowable tension strengths of Hilti and Pneutek fasteners are based on the specific combination of fastener, substrate thickness, and deck gage. Allowable Tension Loads for Hilti Fasteners, Pneutek Fasteners, Simpson Fasteners, Screws and Arc Spot Welds Subject to Uplift Loads are in Table 1.
Consult Verco Web based design tools www.vercodeck.com -> Roof Deck Design Tools -> Steel Deck Uniform Loads -> Connections (Gray Tab at top of tool) for other conditions as required.
