Through-Penetration Firestop Calculator

Size firestop systems for through-penetrations in fire-rated assemblies per ASTM E814/UL 1479 and IBC Section 714

Input Parameters

Results

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Required F Rating
hr
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Required T Rating
hr
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Minimum Seal Depth
in
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Maximum Opening Size
in
Note: Always reference the specific UL system number for the actual firestop product. F and T ratings must meet or exceed the fire rating of the assembly being penetrated. Plastic pipes require additional protection (intumescent collar/wrap) to close the opening when pipe melts.

Reference

ASTM E814 (UL 1479) / IBC Section 714 F Rating = flame-through resistance (must match wall) T Rating = temperature rise limit (325F above ambient on unexposed side) L Rating = air leakage (optional, for smoke barriers) Plastic pipes require intumescent collars/wraps per UL system Seal depth and materials per specific UL system number All firestops must be listed and installed per manufacturers instructions