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Whirlwind manufactures a complete line of metal roofing and wall panels, plus trim and other accessories for all industry types.
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THE Whirlwind PROMISE

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Certifications

Trust the certified components manufactured by Whirlwind.

Whirlwind is committed to high quality. More than 40,000 of our steel buildings are standing strong across the country and around the world.

Every steel part we manufacture is fabricated to exceed the regulations set by the cities, counties, states, and organizations certifying metal building components. We are proud of our dedication to quality and have achieved the following certifications:

IAS accreditedDBPR FloridaFM Approved

Texas Department of InsuranceCity of Houston

Underwater LabMBMA Certified

IAS AC472

We are accredited by the International Accreditation Service (IAS) in compliance with the Accreditation Criteria for Inspection Programs for Manufacturers of Metal Building Systems (AC472). Currently three of our plants are accredited.

Houston, TX – Certification number MB-131 – Parts A, B, and C
Claremore, OK – Certification number MB-217 – Part B
Lithia Springs, GA – Certification number MB-218 – Part B

Factory Mutual (FM Global)

Whirlwind’s Weather Lok-16 and Super Seam-Plus standing seam roof systems are approved in accordance with the FM 4471 Class 1 Approval Standard. However, many roof systems can be approved by Factory Mutual on your project by using the prescriptive method. See your sales representative for additional information.

Texas Department of Insurance

Whirlwind has 10 panels listed.

Panels Rc Number Min Gage Substrate
Weather Guard Roof Panel RC-144 26 Minimum 15/32" Plywood Deck
Weather Snap-16 Roof Panel RC-180 24 Minimum 15/32" Plywood Deck
Minimum 1" x 4" No. 2 Southern Yellow Pine wood purlins
Minimum 2" x 4" No. 2 Southern Yellow Pine wood purlins
Minimum SG-101 16 gauge (0.056") steel hat purlins
Weather-Lok-16 Roof Panel RC-182 24 Minimum 15/32" Plywood Deck
Minimum 16 gauge (0.056") steel purlins
Cor Span Roof Panel RC-183 29 Minimum 15/32" Plywood Deck
Minimum 1" x 4" No. 2 Southern Yellow Pine wood purlins
Minimum 2" x 4" No. 2 Southern Yellow Pine wood purlins
Minimum SG-101 16 gauge (0.056") steel hat purlins
Low Rib Roof Panel RC-184 29 Minimum 15/32" Plywood Deck
Sturdi-Rib Roof Panel RC-185 29 Minimum 15/32" Plywood Deck
Minimum 7/16" Oriented Strand Board (OSB) roof deck
Minimum 1" x 4" No. 2 Southern Yellow Pine wood purlins
Super Span-X Roof Panel RC-186 26 Minimum 15/32" Plywood Deck
Minimum 16 gauge (0.056") steel purlins
Super Span-X Roof Panel RC-480 24 Minimum 16 gauge (0.056") steel purlins
Low-Rib X Roof Panel RC-483 26 Minimum 15/32" Plywood Deck
Minimum 16 gauge (0.056") steel purlins
Super Seam-Plus Roof Panel RC-485 24 Minimum 16 gauge (0.056") steel purlins

Underwriters Laboratories (UL) Uplift Resistance, Fire Ratings, and Impact Resistance

Our products currently fall into one or more groups of standards:

    • Standard for Uplift Resistance and Roof Assemblies, UL 580
    • Standard for Fire Tests of Building Construction and Materials, UL 263
    • Standard for Impact Resistance of Prepared Roof Covering Materials, UL 2218

Listings and Classifications of products that are in compliance with the above Standards are contained in the Roofing Materials & Systems Directory. This Directory is updated annually.

Commercial/Industrial Panels

Panel Const. Number panel width (in) Panel Gauge Lap at Endlaps Member Screw Spacing min. purlin Gauge max. Purlin Spacing Max. Insulation Over Purlins UL Skylight UL-2218 Impact Resistance UL-263 Fire Rating UL-580 Rating
Super Span (X) 30 36" 26 min. 3" to 6" 12 in. 16ga 5'-03/16" 4" No Class 4 Class A Class 30
Super Span (X) 30 36" 26 min. 3" to 6" 4-8-4-8 in. 14ga 5'-03/16" 4" No Class 4  Class A Class 90
Super Span (X) 79 36" 26 min. 3" to 6" 5-7-5-7 in. 16ga 5'-03/16" 4" No Class 4  Class A Class 90
Super Span (X) 161 36" 26 min. 3" to 6" 5-7-5-7 in. 16ga 5'-03/16" 6" No Class 4  Class A Class 90
Super Span (X) 167 36" 24 min. 4" to 6" 5-7-5-7 in. 16ga 5'-03/16" 6" Yes Class 4  Class A Class 90
Low Rib (X) 39 36" 26 min. 6" 6 in. 16ga 5'-03/16" 4" No Class 4  Class A Class 90
7.2 Rib 244 36" 26 min. 4" min. 7.4 in. 16ga 5'-03/16" 4" No Class 4  Class A Class 90

Agricultural/Residential Panels

Panel Const. Number panel width (in) Panel Gauge Lap at Endlaps Member Screw Spacing Substructure max. Joist Spacing UL Skylight UL-2218 Impact Resistance UL-263 Fire Rating UL-580 Rating
Sturdi-Rib 560 36" 29 min.  6"

Interior is 9"

Endlap is  4" average

See Spec

5/8" min.

Plywood		 2'-0" No Class 4 Class A Class 30
Sturdi-Rib 560 36" 29 min. 6"

Interior is 9"

Endlap is  4" average

See Spec

2" x 4" Lathe

No. 2 or Better		 4'-0" No Class 4  Class A Class 90
Sturdi-Span 561 36" 29 min. 6"

Interior is 9"

Endlap is  4" average

See Spec

5/8" min.

Plywood		 2'-0" No Class 4  Class A Class 90
Sturdi-Span 561 36" 29 min. 6"

Interior is 9"

Endlap is  4" average

See Spec

2" x 4" Lathe

No. 2 or Better		 4'-0" No Class 4  Class A Class 90
Weather Guard 529 12" 29 min. N/A 12"

5/8" min.

Plywood		 2'-0" No Class 4  Class A Class 90

Agricultural/Standing Seam Panels

Clip Types: (Fx) Fixed, (Mv) Movable or Floating, (A) Articulating, (U) Utility

 Panel Const. Number  Panel Width (in)   Gauge Clip Type Max. Clip Spacing  Substrate  Max. Insulation Over Purlins  UL Skylight  UL-2218 Impact Resistance  UL-263 Fire Rating  UL-580 Rating 
 Super Seam-II  180B  24"  24 min. Fx, Mv, A 5'-0"  Composite System  See Spec  No  Class 4  Class A  Class 30
Super Seam-II  205   24"  24 min.  Fx, Mv 5'-0"  Open Framing 6"  No  Class 4  Class A   Class 90
Super Seam-II  205A  24"   24 min. Mv, A 5'-0"   Open Framing  6" w/ ⅜" spacer
5" w/ 1" spacer		 Yes  Class 4  Class A  Class 90 
Super Seam-II  286  24"  26 min. U 5'-0"   Plywood  1½" No  Class 4  Class A  Class 90 
Super Seam-II 308B 24" 24 min. Fx, Mv, A 5'-0" Composite System See Spec No Class 4 Class A Class 90
Super Seam-II 534 24" 24 min. Mv, A 5'-0" Open Framing 6" Yes Class 4 Class A Class 90
Super Seam-II 535 24" 24 min. Fx, Mv 5'-0" Open Framing 6" No Class 4 Class A Class 90
Super Seam-II 536 24" 24 min. Mv, A 5'-0" Composite System See Spec No Class 4 Class A Class 90
Super Seam-II 537 24" 24 min. Mv, A 5'-0" Composite System See Spec Yes Class 4 Class A Class 90
Super Seam-II  541  24"   26 min. Mv, A 5'-0"   Plywood  N/A  No Class 4  Class A  Class 90 
Super Seam-Plus 180C 24" 24 min. A 5'-0" Composite System See Spec No Class 4 Class A Class 90
Super Seam-Plus 287 24" 24 min. A 5'-0" Open Framing 6" w/ ⅜" spacer
5" w/ 1" spacer		 Yes Class 4 Class A Class 90
Super Seam-Plus 308 24" 24 min. A 5'-0" Composite System See Spec No Class 4 Class A Class 90
Super Seam-Plus 450 24" 24 min. A 5'-0" Open Framing 6" Yes Class 4 Class A Class 90
Super Seam-Plus 538 24" 24 min. Mv 5'-0¼" Open Framing 6" Yes Class 4 Class A Class 90
Super Seam-Plus 539 24" 24 min. Mv 5'-0" Composite System See Spec No Class 4 Class A Class 90
Super Seam-Plus 540 24" 24 min. Mv 5'-0" Composite System See Spec Yes Class 4 Class A Class 90
Weather Guard 529 12" 26 min. UL 90 12" Plywood N/A No Class 4 Class A Class 90
Weather Lok-16 506 16" 24 min. Fx, Mv 5'-0" Open Framing

8" no spacer

6" w/ spacer		 No Class 4 Class A Class 90
Weather Lok-16 506A 16" 24 min. Fx, Mv 4'-0" Composite System See Spec No Class 4 Class A Class 90
Weather Lok-16 506B 16" 24 min. Fx, Mv 2'-6" Plywood See Spec No Class 4 Class A Class 90
Weather Snap-16 255 18" max. 24 min. UL 90 4'-0" Open Framing 4" Rigid No Class 4 Class A Class 90
Weather Snap-16 303 18" max. 24 min. UL 90 4'-0" Composite System See Spec No Class 4 Class A Class 90
Weather Snap-16 342 18" max. 24 min. UL 90 4'-0" Composite System See Spec No Class 4 Class A Class 90
Weather Snap-16 343 18" max. 24 min. UL 90 3'-0" Plywood / OSB See Spec No Class 4 Class A Class 90
Weather Snap-16 414 18" max. 24 min. UL 90 3'-0" Plywood See Spec No Class 4 Class A Class 90
Weather Snap-16 436 18" max. 24 min. UL 90 4'-0" Plywood See Spec No Class 4 Class A Class 90
Weather Snap-16 446 18" max. 24 min. UL 90 4'-0" Open Framing 3" No Class 4 Class A Class 90
Weather Snap-16 448 18" max. 24 min. UL 90 4'-0" Composite System See Spec No Class 4 Class A Class 90
Weather Snap-16 486 18" max. 24 min. UL 90 4'-0" Composite System See Spec No Class 4 Class A Class 90
Weather Snap-16 508A 18" max. 24 min. UL 90 3'-0" Composite System See Spec No Class 4 Class A Class 90
Weather Snap-16 543 18" max. 24 min. UL 90

4'-0" w/ 24ga

5'-0" w/ 22ga		 Open Framing 3" No Class 4 Class A Class 90
Weather Snap-16 544 18" max. 24 min. UL 90 4'-0" Composite System See Spec No Class 4 Class A Class 90

Florida Approvals

Whirlwind has several panels approved for use in a multitude of situations. All framing and substrates must be designed in accordance with the 2014 Florida Building Code. To see the full list of requirements refer to the approval on FloridaBuilding.org

FL17700
Category: Structural Components
Subcategory: Roof Deck

FL #  PANEL Substrate  HVHZ Approved  
 17700.1 26ga Low Rib X  Open Framing - Min. 16ga steel framing No
 17700.2 29ga Sturdi-Rib  Open Framing - Minimum 1" x 4" No. 2 Southern Yellow Pine wood purlins over supports @ maximum 24" o.c. No 
 17700.3 24ga Super Seam-Plus  Open Framing - Min. 16ga steel framing No 
 17700.4 26ga Super Span X  Open Framing - Min. 16ga steel framing No 
 17700.5 24ga Weather Lok-16  Open Framing - Min. 16ga steel framing No 

FL17702
Category: Structural Components
Subcategory: Structural Wall

FL #  Panel  Substrate  HVHZ Approved 
17702.1  26ga 7.2 Rib / 7.2N Rib  Open Framing - Min. 16ga steel framing No
17702.2  26ga Low Rib X Open Framing - Min. 16ga steel framing  No 
17702.3   26ga Super Span X Open Framing - Min. 16ga steel framing  No 

FL17704
Category: Roofing
Subcategory: Metal Roofing

FL #  PANEL SUBSTRATE  HVHZ APPROVED  
 17704.1  29ga Sturdi-Rib Minimum 7/16" OSB sheathing over supports @ maximum 24" o.c.  No
 17704.2  29ga Sturdi-Rib Minimum 15/32" APA rated plywood over supports @ maximum 24" o.c. No 
 17704.3  24ga Weather Lok-16 Minimum 15/32" APA rated plywood over supports @ maximum 24" o.c. No 
 17704.4 24ga Weather Snap-16 Minimum 15/32" APA rated plywood over supports @ maximum 24" o.c. No 

City of Houston - Public Works and Engineering Certificate of Approval

For more information on all of Whirlwind's certifications and associations please contact our research and development department. 

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