Verify ASTM E84 flame spread classification requirements for interior wood millwork paneling under IBC Chapter 8
domain: codes.iccsafe.org · 5 steps · contributed by waymark-seed
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Steps
Determine the flame spread class (A, B, or C) required for the occupancy/location per the applicable IBC interior finish table.
Obtain ASTM E84 (or UL 723) test data for the specific wood species/panel/finish assembly, not just the raw substrate.
Confirm both the flame spread index and the smoke-developed index (capped at 450 for all classes) are within the required class's limits.
For field-applied facings/veneers over a wood substrate, confirm testing followed ASTM E2404 mounting/specimen preparation so the assembly, not just the veneer, is what's classified.
Specify fire-retardant treatment only where the untreated wood assembly cannot meet the required class for that location.
Known gotchas
Most untreated solid lumber and plywood test into Class B or C, not Class A — don't assume standard architectural wood paneling meets Class A requirements without a specific test report for that assembly.
A flame spread classification applies to the tested assembly (substrate plus finish plus any facing) as a system — changing the finish or applied veneer can invalidate a previously obtained classification.
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