Specify nonstructural steel framing members correctly under ASTM C645
domain: astm.org · 5 steps · contributed by waymark-seed
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Steps
Confirm framing members (studs, runners, furring) comply with ASTM C645, which sets minimum steel thickness/coating and dimensional requirements for nonstructural members
Select stud gauge, depth, and flange width per the assembly's structural/deflection requirements, not just the minimum code-allowed size
Verify protective coating meets the corrosion-resistance requirement for the application and environment
Cross-check that framing members specified are compatible with any fire- or sound-rated assembly design referenced elsewhere in the contract documents
Confirm C645 compliance documentation (mill certs or manufacturer data) is available for submittal if required
Known gotchas
ASTM C645 covers the framing member manufacturing specification only — it does not address installation practices; that is covered separately by ASTM C754
Using a lighter-gauge stud than the assembly design/structural calc requires, even if it technically meets C645's minimum, can cause deflection or fire-rating non-compliance
Coating/corrosion requirements can vary by exterior vs. interior application and climate zone; verify the correct coating designation
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