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Verco/Vulcraft Group - DoveTail Factory Mutal (FM)

All 2" and 3.5" DoveTail roof deck profiles meet Factory Mutual (FM) Approvals for: Steel Roof Decks; Class I fire; Class I-60, I-75, and I-90 Wind Uplift Rating; Live Load Deflections; and Foot Traffic Resistance of Insulation per FM Standard 4451. Allowable spans for 2" and 3.5" DoveTail decks attached with approved steel deck fasteners, based upon the most conservative considerations of FM Standard 4451 for live load deflection, and Class I-60, I-75, and I-90 Wind Uplift Rating related to deck bending are shown in Table 3. Designs would be limited to the lesser of the spans in Table 3 or as specified within the listing of the FM Approved steel deck fasteners selected. Alternately, Table 4 show allowable spans based upon the most conservative considerations of FM Standard 4451 for live load deflection, and Class I-60, I-75, and I-90 Wind Uplift Rating related to deck bending and fastener pullover for arc spot welds.
 
Verco / Vulcraft Group FM Approval Report
Verco / Vulcraft Group FM Certificate of Compliance
 
Note: that approved spans are measured center-to-center of support members. FM Standard 4451 limits deflection to L/240 for a 200 lb. point load at mid-span. The specific FM Approved above deck components and their selected attachments must also be considered.

Table 3: Simplified FM Approved Spans (c-c) for DoveTail Decks Limited by Live Load Deflection and Deck Bending Due to Class I-60, I-75, and I-90 Wind Uplift Ratings
Gage No. of Spans Deck Type
2.0D 2.0DA 3.5DA 3.5DA
22 1 9'-1" 8'-10" - -
2 10'-2" 9'-11" - -
3+ 10'-8" 10'-5" - -
20 1 10'-0" 9'-9" 17'-5" 17'-0"
2 11'-6" 11'-3" 16'-0" 15'-7"
3+ 11'-10" 11'-6" 17'-11" 17'-5"
18 1 11'-7" 11'-4" 21'-0" 20'-6"
2 13'-7" 13'-3" 19'-10" 19'-4"
3+ 13'-8" 13'-4" 22'-2" 21'-7"
16 1 13'-0" 12'-8" 24'-1" 23'-5"
2 15'-4" 14'-11" 23'-3" 22'-8"
3+ 15'-4" 14'-11" 26'-0" 25'-4"

 
Table 4: Simplified FM Approved Spans (c-c) for DoveTail Decks Limited by Live Load Deflection, Deck Bending, and Arc Spot Weld Pull-Over Due to Class I-60, I-75, and I-90 Wind Uplift Ratings
Gage No. of Spans 3/4" Visible Weld Diameter 7/8" Visible Weld Diameter
Deck Type and Support Weld Spacing Deck Type and Support Weld Spacing
2.0D 3.5D 2.0D 3.5D
6 1/8" o.c. 12 1/4" o.c. 8" o.c. 6 1/8" o.c. 12 1/4" o.c. 8" o.c.
22 1 9'-1" 9'-1" - 8'-10" 8'-10" -
2 10'-2" 5'-5" - 9'-11" 6'-4" -
3+ 10'-8" 6'-9" - 10'-5" 8'-0" -
20 1 10'-0" 10'-0" 17'-5" 9'-9" 9'-9" 17'-0"
2 11'-6" 6'-7" 10'-3" 11'-3" 7'-9" 12'-1"
3+ 11'-10" 8'-3" 12'-10" 11'-6" 9'-9" 15'-1"
18 1 11'-7" 11'-7" 21'-0" 11'-4" 11'-4" 20'-6"
2 13'-7" 8'-10" 13'-9" 13'-3" 10'-4" 16'-3"
3+ 13'-8" 11'-0" 17'-3" 13'-4" 13'-0" 20'-4"
16 1 13'-0" 13'-0" 24'-1" 12'-8" 12'-8" 23'-5"
2 15'-4" 11'-2" 17'-7" 14'-11" 13'-2" 20'-9"
3+ 15'-4" 13'-11" 21'-11" 14'-11" 14'-11" 25'-4"

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