Use of this Specification is entirely voluntary. Each component designer or specifier retains the right to choose their own design. Responsibility for designing and specifying materials for building and building components to comply with applicable state and local codes and specifications and safety considerations is with the designer and/or material specifier.

LGSI assumes no responsibility whatsoever for the application of this information to the design, specification or construction of any specific building or structure. LGSI expressly disclaims all liability for damages of any sort whether direct, indirect or consequential, arising out of the use, reference to or reliance on this Specification or any of its contents.

This Guide Specification is intended as an aid for designers or material specifiers in defining standards for the manufacture, design and installation of light gauge structural components (purlins and furring members). Items in square brackets [ ] are options. Select one from the options listed. Items to be filled out by the designer or specifier are indicated by underlines _______. Items following Editor: are notes for the user and are not to be included as part of the Specification.

1. Formed [purlin or furring] framing.

1. AISI 1996 – Cold-Formed Steel Design Manual, 1996 edition published by the American Iron and Steel Institute.
2. ASCE 7-95 – American Society of Civil Engineers – Minimum Design Loads for Buildings and Other Structures.
3. ASTM A570/A570M-95 – Hot-Rolled Carbon Steel Sheet and Strip, Structural Quality.
4. ASTM A607-92a – Hot-Rolled Sheet and Strip, or Cold-Rolled Sheet, or Combinations thereof.
5. ASTM A653/A653M-95 – Steel Sheet, Zinc Coated (Galvanized) or Zinc-Iron Alloy- Coated (Galvannealed) by the Hot Dip Process in Coils and Cut Lengths.
6. ASTM B117-97 – Standard Practice for Operating Salt Spray (Fog) Apparatus.
7. ASTM D523-89(1994)e1 – Standard Test Method for Specular Gloss.
8. ASTM D714-87(1994)e1 – Standard Test Method for Evaluating Degree of Blistering of Paints.
9. ASTM D1186-93 – Standard Test Methods for Nondestructive Measurement of Dry Film Thickness of Nonmagnetic Coatings Applied to a Ferrous Base.
10. ASTM D3359-95a – Standard Test Methods for Measure Adhesion by Tape Test.
11. ASTM D3363-92a – Standard Test Method for Film Hardness by Pencil Test.
12. AWS D1.1 – Structural Welding Code, and D1.3 – Structural Welding Code, Sheet Steel.
13. BOCA 1996 – Building Officials & Code Administrators – BOCA National Building Code / 1996.
14. FS TT-P 636D – Primer for Steel, and 645 – Primer for Steel.
15. LGSI – Light Gage Structural Institute - Light Gage Structural Institute Framing System Design Handbook, 1998 edition.
16. MBMA 1996 – Metal Building Manufacturers Association – Low Rise Building Systems Manual – 1996 edition.
17. SBC 1997 – Standard Building Code, 1997 edition.
18. SSPC – Steel Structures Painting Council – SP-10 – Near-White Blast Cleaning.
19. SSPC – Steel Structures Painting Council – SP-8 – Acid Pickling Process.
20. UBC 1997 – 1997 Uniform Building Code published by the International Conference of Building Officials.

1. Select building code provisions using building geometry as follows:
1. Structure width (perpendicular to ridge) ______ [ft or m].
2. Structure length (parallel to ridge) ______ [ft or m].
3. [Roof slope _____] or [Average roof height _____ [ft or m] ].
4. Bay spacing [___ bays at _____ [ft or m] for uniform bays] or [____, ____, [ft or m] for non uniform bays] or [as specified on drawings].
5. Sidewall height [ft or m].
2. Size components to support dead load of supported components and:
1. [Ground or roof] snow load of _____ [psf or kpa], [Snow exposure ____].
2. Live load of _____ [psf or kpa] [with or without] tributory area load reduction.
3. Collateral load of _____ [psf or kpa].
4. Wind load of_____ [mph or kph] or [psf or KPa], [Exposure ___].
5. Building use (occupancy) category _______.
6. Loads shall be applied in accordance with [ASCE 7-95 or BOCA 1996 or MBMA 1996 or SBC 1997 or UBC 1997 or _____] code.
7. Mechanical point loads [as specified on mechanical drawings].

3. Deflection requirements shall be limited as follows:
1. Secondary structural members:
   Roof framing for gravity load [L/120 or L/150 or L/180 or L/___].
   Wall and roof framing for wind load [L/120 or L/150 or L/180 or L/___].
2. Sheeting:
   Roof panel for gravity load [L/120 or L/150 or L/180 or L/___].
   Roof and wall panel for wind load [L/120 or L/150 or L/180 or L/___].

4. Design system to accommodate construction tolerances, deflection of building structural members and clearances of intended openings.
5. Design framing system to provide for movement of components without buckling of components, failure of joint seals and undue stress on fasteners when subject to a temperature range of ___ to ___ degrees [F or C].
6. Detail components and connections to accommodate tolerances required for field assembly.

1. Manufacturer of Light Gauge Framing:
1. Company specializing in fabrication of structural framing components with five years minimum experience.
2. Certified by the Light Gage Structural Institute, meeting current Inspection Guidelines.
2. Design structural elements under direct supervision of a Professional Engineer experienced in design of structural framing and furring members.
3. Base design on Cold-Formed Steel Design Manual as published by the American Iron and Steel Institute and the Light Gage Structural Steel Framing System Design Handbook as published by the Light Gage Structural Institute.
4. Structural members must bear the LGSI inspection sticker.

1. Submit shop drawings and product data as required for the scope of the project and extent of work of this section.
2. Indicate on shop drawings component details, framed openings, anchorage, loading, type and location of fasteners and accessories or items required for other related work.
3. Provide [purlin or furring] layout.
4. Describe method for securing framing connections [Flange bolted or Web bolted].
5. Provide calculations for loads, stresses, deflections, and frame connection reactions.
6. Provide product data on standard framing members. Describe materials and finish, product criteria and limitations.
7. Provide proof of LGSI membership.

1. Structural Components:
1. Store structural members above ground on platforms, skids or other supports.
2. Protect steel from corrosion.
3. Keep primed steel off ground by placing on wooden supports, separate with wooden separators.
4. Avoid damaging prime coat, use wooden protectors to prevent damage from chain or cable cinches.

1. [Purlins or Furring]:
1. ASTM [A653, 16 gauge and heavier, galvanized] with minimum gauge tolerances as specified in LGSI Inspection Guidelines.
2. ASTM [A607, 18 gauge and heavier, painted or A570, 16 gauge and heavier, painted] with minimum gauge tolerances as specified in LGSI Inspection Guidelines.
3. Formed to profiles, shapes, gauge and nominal sizes as required to resist loading as indicated herein, designed in accordance with referenced standards.
4. Minimum yield strength for all members 16 gauge or heavier: [55 ksi or 379 MPa]
5. Z-sections must have unequal flange dimensions (and flanges clearly marked) to avoid uneven top flange nesting. Z-sections must have a 50 degree lip (edge stiffener).

1. Bracing and Bridging: Formed sheet steel, thickness determined for conditions encountered, manufacturer’s standard shapes, same finish as framing members.
2. Plates, Gussets, Clips: Formed sheet steel, thickness determined for conditions encountered, manufacturer’s standard shapes, same finish as framing members.

1. Self-drilling, Self-tapping Screws, Bolts, Nuts and Washers: As required to rigidly connect members together to meet structural requirements and between members and supporting substrates, of size, type and spacing as recommended by framing manufacturer.
2. Anchorage Devices: [power driven, power actuated, drilled expansion bolts, screws with sleeves to meet structural requirements or as recommended by manufacturer for size and spacing].

1. Fabricate assemblies of framed sections of sizes and profiles required; with framing members fitted, reinforced and braced to satisfy design requirements. Factory welds shall meet AWS D1.1 and AWS D1.3.
2. Fit and assemble in largest practical sections for delivery to site, ready for installation.
3. Thoroughly clean members in accordance with [SSPC SP-10 or SSPC SP-8] prior to finishing.

1. Galvanizing: [G90 or G60 or G40 or G30] coating class. Use cold galvanizing compound for repairing surfaces damaged during erection.
2. Primer, Painted: All primers shall be factory applied, oven baked primer coatings.
1. Coating Thickness: All primers shall have a minimum dry film thickness of 0.5 mils when tested with a dry film gauge in accordance with ASTM D1186.
2. Salt Spray Test: A sample sheet shall withstand a salt spray test for a minimum of 144 hours in accordance with ASTM B117 and upon immediate removal of the coupon from the test, there will be no blisters larger than a #6 with a frequency rating of "few" as determined by ASTM D714. After a four hour recover, there will be no loss of adhesion when tested with Scotch Brand No. 600 cellophane tape.
3. Adhesion: A sample when tested in accordance with ASTM D3359, method B, will exhibit no visible paint removal when using Scotch Brand No. 600 cellophane tape.
4. Formability: The finished, coated product is suitable for roll forming or press break operations where the inside radius of a bend is not less than 3/16 inch or 5 mm. The paint will show no signs of fracture to the naked eye or loss of adhesion, unless caused by failure of the metal substrate. Hair line crazing which may occur during forming operations is considered normal.
5. Pencil Hardness: Minimum pencil hardness using Empire Berol Turquoise Pencils is 2H in accordance with ASTM D3363.
6. Specular Gloss: Metal Prep primers have a gloss of 10 to 15 percent at a meter angle of 60 degrees in accordance with ASTM D523.
3. Primer: FS TT-P 645 for field applied touch-up only.

1. Must be manufactured in accordance with LGSI Inspection Guidelines.

1. Verify that substrate surfaces and building framing components are ready to receive work.
2. Beginning installation indicates acceptance of existing conditions, substrate and responsibility for performance.

1. Install components in accordance with manufacturer’s instructions.
2. Place members at spacing as noted on drawings or as required by span capacity of surfacing material. Connect members using fastener method specified by supplier.
3. Erect members, brace and reinforce to develop full strength to meet design requirements.
4. Purlins and Girts:
1. Provide rake and/or gable angles with tight fitting closure channels and fascias.
2. Locate and space wall girts to suit door and window arrangements and heights.
5. Touch-up field welds and damaged galvanized surfaces.
6. Complete framing ready to receive surface finish materials.

1. Maximum variation from true position: ¼ inch or 6 mm.
2. Maximum variation of any member from plane: ¼ inch or 6 mm.