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The Cold-Formed Steel Design Manual is the American Iron and Steel Institute’s 2017 reference for applying cold-formed steel member-design provisions, and it should be used alongside the standards adopted for your project rather than treated as a stand-alone building code. The listed edition is available in print and electronic formats and includes the AISI S100-16 Specification and Commentary.
For a building project, the practical sequence is to confirm the governing code and AISI editions, establish loads and boundary conditions, use the manual’s section-property and member-design procedures, then check connections and the complete framing system under the project’s structural, seismic, fire and detailing requirements. The companion Cold-Formed Steel Framing Design Guide is a separate 2016 resource focused on framing-system examples.
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What is the Cold-Formed Steel Design Manual?
The manual is an AISI design reference for engineers working with cold-formed steel (CFS) members. AISI’s official catalog identifies the current listed product as the Cold-Formed Steel Design Manual, 2017 Edition, offered as a printed book and an electronic edition, with the AISI S100-16 Specification and Commentary included. Confirm the catalog listing before purchase because format, availability and catalog terms can change.
Cold-formed steel is shaped at room temperature from sheet or strip steel. Typical members include studs, joists, tracks, channels, angles, built-up sections and other thin-walled shapes. Their thin elements make local, distortional and overall buckling important design considerations, so a design reference must address more than a simple steel-yield calculation. The manual organizes the calculations and examples needed to apply the specification consistently.
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The manual is not a substitute for the adopted building code, project drawings, manufacturer data, or the engineer of record’s judgment. It explains how to apply the referenced AISI provisions; the authority having jurisdiction determines which code and standard editions govern a particular project.
What does the 2017 edition contain?
The catalog description identifies the S100-16 Specification and Commentary as part of the 2017 manual. In practice, that pairing gives the designer both the mandatory-style specification text and explanatory material that clarifies assumptions, limits and calculation intent.
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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesIndustry resource material describes the AISI D100 manual as being based on S100 provisions and containing section-property and member-design examples. Those examples are useful for checking a spreadsheet, understanding the order of calculations, and seeing how provisions are applied to common CFS shapes. They are examples, not permission to bypass project-specific loads, restraints, material grades or connection conditions.
Typical work supported by a manual of this type includes:
- Determining gross and effective section properties for thin-walled shapes.
- Checking compression, tension, flexure, shear and combined actions.
- Considering local, distortional and overall buckling modes where the specification requires them.
- Accounting for bracing, unbraced length, continuity and load distribution assumptions.
- Documenting the design basis so another engineer can reproduce the result.
The exact equations, resistance factors and limits must be taken from the edition and standards adopted for the job. Do not copy a coefficient from a later edition into an S100-16 calculation without verifying compatibility.
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How is the design manual different from the framing design guide?
The two AISI products are complementary, not interchangeable. The manual is centered on member design and section-property procedures; the separate framing design guide presents framing standards and system-design examples.
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Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →| Resource | Listed edition | Main purpose | Best use |
|---|---|---|---|
| Cold-Formed Steel Design Manual | 2017 | Member-design procedures, section properties and examples based on AISI S100-16 | Designing and checking individual studs, joists, beams, tracks and related members |
| Cold-Formed Steel Framing Design Guide | 2016 electronic edition | Framing standards and system-design examples | Understanding how members work together in walls, floors, roofs and other framing assemblies |
The distinction matters when selecting references for a project. A member can pass a strength check while the wall, diaphragm, transfer path, bracing layout or connection detail still fails a system requirement. Use the manual for the member calculations and the framing guide, project standards and engineered details for the assembly-level decisions.
The AISI catalog lists both products in its manuals and design guides collection. Check the product title and edition carefully; similarly named resources are not automatically interchangeable.
Which AISI standards should be checked before design?
Before opening a calculation, identify the standards named by the project’s adopted code and specifications. The National Council of Structural Engineers Associations lists AISI S100 for structural member design, S240 for structural framing, S400 for seismic design and S220 for nonstructural framing, along with related manuals and guides. Its cold-formed steel resource page is a useful index, but the legally applicable edition comes from the project jurisdiction.
- AISI S100: The core specification for cold-formed steel structural member design. The 2017 manual includes the S100-16 Specification and Commentary.
- AISI S240: The North American Standard for Cold-Formed Steel Structural Framing. The cited S240-20 text cross-references other standards and design manuals for applications such as diaphragm design.
- AISI S400: Seismic design provisions where the project’s seismic system and adopted code require them.
- AISI S220: Nonstructural framing provisions, which should not be confused with the requirements for load-bearing structural framing.
Read the project specification and code adoption ordinance, not just a product page. A public Ohio school specification, for example, directs designers to particular AISI standards for general framing, headers and roof trusses. That document illustrates how a project can specify standards; it is not universal guidance for every state, occupancy or building type. The Ohio specification section should therefore be treated as an example of project-specific direction.
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How do you use the manual on a real project?
Start with the project requirements, then use the manual to perform and document the member checks. A disciplined workflow prevents a numerically correct calculation from being applied to the wrong standard or load path.
- Confirm the design basis. Record the governing building code, adopted AISI editions, risk category, occupancy, design method, material specification, corrosion environment, fire requirements and any owner or authority requirements. Note whether the member is structural or nonstructural.
- Define the load path. Identify dead, live, roof, snow, wind, seismic, equipment, partition and construction loads that actually reach the CFS member. Establish tributary widths, support conditions, spans, continuity, bearing lengths and locations of concentrated loads.
- Select a documented shape and material. Record thickness, coating, steel grade, yield and tensile strengths, nominal dimensions, perforations, lips, stiffeners and any built-up configuration. A manufacturer’s catalog can supply geometry, but the design resistance still comes from the governing standard and verified properties.
- Establish restraint and bracing. Determine what prevents lateral movement, twist, web crippling or distortional buckling. Do not assume sheathing, bridging, clips or fasteners provide restraint unless the detail and the applicable standard justify that assumption.
- Calculate section properties. Use the manual’s procedures or verified tabulated properties for gross and effective sections. Thin elements may lose effective width after buckling, so gross-area properties alone can overstate capacity.
- Check the relevant limit states. Depending on the member and loading, check compression, tension, flexure, shear, combined axial and bending effects, local buckling, distortional buckling, overall buckling and web failure at reactions or concentrated loads. Apply the resistance or safety format required by the adopted specification.
- Design connections and interfaces. Check screws, welds, bolts, bearing, tear-out, pull-over, pull-out, block shear, eccentricity and force transfer into tracks, clips, anchors, sheathing or supporting structure. A member calculation does not validate its connection automatically.
- Check serviceability and detailing. Evaluate deflection, drift, vibration, ponding where relevant, movement compatibility, fastener spacing, access for installation, corrosion protection, firestopping and tolerances. Coordinate openings, utilities and penetrations before issuing the design.
- Review the complete system. Confirm that wall, floor or roof assemblies provide the required diaphragm, shear-wall, bracing and collector behavior. Use the framing guide and project-specific engineering details for system examples rather than treating an isolated member example as a complete assembly design.
- Record assumptions and revisions. Put the code edition, AISI edition, loads, material, section, restraints, connection schedule, software or spreadsheet version and governing result on the calculation sheet. Recheck the design if any of those inputs change.
What information should appear on a CFS design calculation?
A reviewable calculation should allow another engineer to follow the load path without guessing. Include a plan or sketch showing span, supports, bracing and load locations; a material and section schedule; factored and service load combinations; effective-width or buckling calculations; connection forces and capacities; and a summary identifying the governing limit state and utilization.
For repetitive framing, show how representative members were selected. The most heavily loaded stud may not be the member with the smallest capacity: an opening jamb, discontinuous track, end stud, splice, bearing point or member with a different bracing condition can govern. Identify those exceptions explicitly.
Software can accelerate calculations, but the engineer remains responsible for inputs and interpretation. Verify that a program uses the same AISI edition, design method, material definitions and effective-section assumptions as the project. Keep an independent check for unusual geometry, built-up members and load combinations outside the software’s documented scope.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallWhen should structural and nonstructural framing be treated differently?
Structural framing carries gravity, wind, seismic or other defined building loads and must be designed under the structural provisions adopted for the project. Nonstructural framing may support finishes or partitions without being part of the primary load path, but it still needs appropriate design for its own weight, attachments, deflection compatibility, fire and acoustic requirements. A label such as “metal stud” does not determine the governing standard.
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Use AISI S220 where the project identifies nonstructural framing, and use the structural framing provisions where members support building loads. If a partition later receives cabinets, heavy fixtures, rooftop equipment or lateral restraint, revisit its classification and load path rather than relying on a nonstructural detail.
How do code editions and project specifications affect the manual?
The 2017 manual’s inclusion of S100-16 does not mean S100-16 governs every current project. Jurisdictions adopt building codes and referenced standards on different schedules, and a contract may require a particular edition. A newer standard can change terminology, equations, resistance factors or scope, so mixing editions can produce an unreviewable design.
Ask the authority having jurisdiction or the project’s structural specifications for the adopted edition before design. If the contract names S240-20, for example, use that project requirement together with the referenced member-design provisions; do not infer that the 2020 edition applies merely because it is available online. Keep a dated code-and-standard register in the calculation package.
What are the most common mistakes?
- Buying the wrong title: The 2017 design manual and 2016 framing design guide have similar names but different purposes.
- Assuming the catalog edition is the code edition: Product publication date and jurisdictional adoption date are separate questions.
- Using gross properties for every check: Thin elements can require effective properties after buckling.
- Ignoring restraint assumptions: Unbraced length, sheathing attachment and bridging must match the actual detail.
- Checking members but not connections: Fastener, bearing, pull-over, weld and anchor failures can govern.
- Designing a single member in isolation: Diaphragm, shear-wall, collector and transfer behavior belong to the system review.
- Overlooking openings and concentrated loads: Headers, jambs, tracks and web crippling checks often differ from typical studs.
- Failing to coordinate nonstructural work: Deflection, movement joints, firestopping and finish attachments can change the required detail.
Should you buy the printed or electronic edition?
Choose the format that matches the way the design team searches and records references. The printed edition is convenient for a plan-room or office library; the electronic edition is easier to search and distribute within a controlled project document system. The official catalog lists both formats, but price and availability are not fixed facts and should be confirmed at the time of purchase.
For procurement, verify the exact product title, edition year, included S100 specification and commentary, format, seller and licensing terms. Do not assume a marketplace listing is the same edition as the AISI catalog entry. The catalog’s official collection is the safest starting point for confirming identity.
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What should a designer confirm before issuing drawings?
Use this release checklist:
- Code, AISI editions and project specifications are identified and jurisdictionally accepted.
- Structural versus nonstructural scope is clear.
- Loads, combinations, spans, supports and load paths are shown.
- Material grade, thickness, coating and section geometry match the specified product.
- Local, distortional, overall buckling and web limit states are addressed where applicable.
- Connections, splices, tracks, anchors, sheathing and bracing transfer the calculated forces.
- Openings, concentrated reactions, construction stages and tolerances are coordinated.
- Serviceability, fire, corrosion, acoustic and movement requirements are documented.
- Calculations identify the governing result and retain the assumptions used.
That checklist turns the manual from a reference book into a traceable design process. The manual supplies member-design guidance; the project code, framing standards and engineered details determine how that guidance is applied to the building in front of you.
Frequently Asked Questions
Is the 2017 Cold-Formed Steel Design Manual still usable?
It remains useful when a project adopts provisions compatible with the included S100-16 Specification and Commentary. For a current project, confirm the jurisdiction’s adopted edition and any contract requirement before relying on its equations or examples.
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Can the design manual replace a cold-formed steel design software package?
The manual provides the design provisions and worked examples, but it does not remove the need to check inputs, load combinations, connections and system behavior. Spreadsheets or software can automate arithmetic only when their standard edition and assumptions are verified.
Where can I find AISI standards for seismic or nonstructural framing?
NCSEA’s cold-formed steel materials page identifies S400 for seismic design and S220 for nonstructural framing, alongside S100 and S240. Obtain the legally applicable editions through the project’s code and specification process.
Do I need the framing design guide if I already own the manual?
Often, yes. The manual focuses on member and section-property design, while the separate 2016 framing design guide presents framing-system examples and standards applications. The two resources address different levels of the design problem.
