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Double-Lok
  • Description
  • Attributes & Advantages
  • Double-Lok - Section Properties
  • Allowable Uniform Loads In Pounds Per Square Foot
Double-Lok® is a metal standing seam roofing product attached to sub-framing using a variety of concealed, interlocking clips that provide for minimum panel penetrations. Double-Lok® panels can be used on new construction as well as retrofit on existing structures. This panel design provides a high degree of weathertightness and has been tested by independent laboratories in accordance with ASTM E283 and E331 (for air infiltration, water penetration, and wind uplift).

    Gauge

  • 24 gauge (standard)
  • 22 gauge

    Length

  • 50' maximum is standard but longer lengths available by special request

    Dimensions

  • 24" wide by 3" high

    Finish

  • Galvalume Plus®
  • Signature® 200 Colors
  • Signature® 300 Colors

    Limitations

  • Recommended for roof slopes of ¼:12 or greater. Fixed clip recommended only for double
    slope buildings 200' wide or less and single slope buildings 100' wide or less. (May vary upon extreme weather conditions.) Oil-canning is not a reason for rejection

    Fasteners

  • Concealed fastening system. The clips are available as floating or fixed. Two different clip heights are available to allow for thermal blocks.

Usage

New and retrofit applications
Star Shield
Attributes

  1. Panel penetration is eliminated over the entire building envelope other than at the end laps and panel ends which are connected by a compression joint
  2. Factory notched at both ends with pre-punched holes
  3. End laps feature a 16 gauge backup plate with pre-punched holes
  4. Fewer exposed fasteners (by 80%) than traditional side lap panels
  5. Air infiltration and water penetration tests under IAS E283 and E331 methods performed on side lap panels
  6. Signature® 300 paint system
  7. Tall or short clips
  8. Panel side laps feature a factory applied sealant
  9. UL® 90 and FM rated
  10. Optional product and weathertightness warranties
Advantages

  1. Assures a weathertight building envelope
  2. Maximizes field installation efficiency with installation allowed from either end of building or on both sides simultaneously
  3. Allows solid connection at end laps plus proper fastener spacing;
    Pre-punched holes facilitate installation and assure proper panel placement
  4. Maximizes weathertightness
  5. Assures specifiers of minimal air infiltration and water penetration
  6. 25-year finish warranty
  7. Maximizes insulation systems options including 1" thermal spacers at the purlins
  8. Facilitates weathertight construction and ease of installation
  9. Lowers insurance costs
  10. Adds to customer confidence
Star Shield
DoubleLok® - Section Properties

  NEGATIVE BENDING POSITIVE BENDING
Panel
Gauge		 FY
(KSI)		 WEIGHT
(PSF)		 Ixe
(IN.4/FT.)		 Sxe
(IN.3/FT.)		 Maxo
(KIP-IN.)		 Ixe
(IN.4/FT.)		 Sxe
(IN.3/FT.)		 Maxo
(KIP-IN.)
24 50 1.23 0.1507 0.0989 2.9619 0.3224 0.1307 3.9132
22 50 1.56 0.2059 0.1394 4.1747 0.4205 0.1708 5.112

Properties Notes:

  1. All calculations for the properties of Double-Lok® panels are calculated in accordance with the 2001 edition of the North American Specification For Design Of Cold-Formed Steel Structural Members.
  2. Ixe is for deflection determination.
  3. Sxe is for bending.
  4. Maxo is allowable bending moment.
  5. All values are for one foot of panel width.
Allowable Uniform Loads
In Pounds Per Square Foot - 16" Panels

24 Gauge (Fy = 50 Ksi)
SPAN
TYPE		 LOAD
TYPE		 SPAN IN FEET
2.5 3.0 3.5 4.0 4.5 5.0 5.5
SINGlE LIVE 204.0 170.0 145.7 127.5 113.3 102.0 86.2
2-SPAN LIVE 204.0 170.0 145.7 123.4 97.5 79.0 65.3
3-SPAN LIVE 204.0 170.0 145.7 127.5 113.3 98.7 81.6
4-SPAN LIVE 204.0 170.0 145.7 127.5 113.3 82.2 76.2
22 Gauge (Fy = 50 Ksi )
SPAN
TYPE		 LOAD
TYPE		 SPAN IN FEET
2.5 3.0 3.5 4.0 4.5 5.0 5.5
SINGlE LIVE 296.9 247.5 212.1 185.6 165.0 136.3 112.7
2-SPAN LIVE 296.9 247.5 212.1 173.9 137.4 111.3 92.0
3-SPAN LIVE 296.9 247.5 212.1 185.6 165.0 139.1 115.0
4-SPAN LIVE 296.9 247.5 212.1 185.6 160.4 129.9 107.4

Allowable Uniform Loads Notes:

  1. Allowable loads are based on uniform span lengths and Fy = 50 ksi.
  2. LIVE LOAD is limited by bending, shear, combined shear and bending and web crippling.
  3. Allowable loads consider a maximum deflection ratio of L/180.
  4. The weight of the panel has not been deducted from the allowable loads.
  5. THE ALLOWABLE UNIFORM LOADS ARE NOT FOR USE WHEN DESIGNING PANELS TO RESIST WIND UPLIFT.
  6. Please contact manufacturer or manufacturer's website for most current allowable wind uplift loads.
  7. The use of any field seaming machine other than that provided by the manufacturer may damage the panels, void all warranties and will void all engineering data.

The engineering data contained herein is for the expressed use of customers and design professionals. Along with this data, it is recommended that the design professional have a copy of the most The engineering data contained herein is for the expressed use of customers and design professionals. Along with this data, it is recommended that the design professional have a copy of the most current version of the North American Specification for the Design of Cold-Formed Steel Structural Members published by the American Iron and Steel Institute to facilitate design. This Specification contains the design criteria for cold-formed steel components. Along with the Specification, the designer should reference the most current building code applicable to the project jobsite in order to determine environmental loads. If fur ther information or guidance regarding cold-formed design practices is desired, please contact the manufacturer.

EFFECTIVE NOVEMBER 3, 2004
SUBJECT TO CHANGE WITHOUT NOTICE

 Double-Lok® is a registered trademark of the NCI Group.
Galvalume Plus® is a registered trademark of BIEC International, Inc.
Signature® is a registered trademark of the NCI Group.