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Fire-Rated Glazing Typical Edge Clearance Reference

Look up a typical listed edge clearance (bite) range for common fire-rated glazing and frame type combinations.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-26 · v1.0.0

Market
Imperial · sales tax

Typical listed edge clearance

0.37 in

Low confidence

This is a TYPICAL reference figure only, not a calculated or code-compliant value — fire-rated glazing edge clearance is set entirely by the specific tested and listed assembly (UL 9/UL 10B/UL 10C, NFPA 80/257). Always verify the exact bite/clearance against your specific product's UL listing and the manufacturer's installation instructions before installation; deviating from the tested clearance voids the fire rating.

Running these inputs gives 9.50 mm as the typical listed edge clearance. Low confidence on these inputs, so use the number to plan rather than to order. Currently reading for United States under IRC 2024 — pick a different market above and the figures re-cast accordingly.

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This result is a specification — 0.374 in — not a quantity. Put the thing it sizes into your project: how many, what you call it, and your supplier’s price.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • Fire-rated glazing edge clearance is NOT governed by a calculable thermal-expansion formula — it is set entirely by the specific tested and listed assembly per UL 9/UL 10B/UL 10C and NFPA 80/257. The values below are commonly-cited TYPICAL figures for reference only.

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Frequently asked questions

Is this edge clearance value calculated from the glass and frame properties?
No. Fire-rated glazing edge clearance is not governed by a calculable thermal-expansion formula — it is fixed by the specific assembly's UL 9/UL 10B/UL 10C listing and NFPA 80/257 requirements. The figures here are commonly-cited typical values for reference only, not a substitute for the tested listing.
Can I use this value directly for installation?
No — always verify the exact bite/clearance required against your specific product's UL listing and the manufacturer's installation instructions before installing. Using a different clearance than what was tested and listed voids the fire rating of the assembly.
What happens if my exact glazing/frame combination isn't in the table?
This lookup defaults to the hollow-metal frame value for the selected glazing type when a specific combination isn't listed, but that default is only a rough reference point — the manufacturer's actual listed clearance for your specific frame type must still be confirmed.