🛑 ASTM E814 / UL 1479 (F-Rating Flame Hours & T-Rating Temp Rise, Intumescent Seal)

Through-Penetration Firestop Calculator

Size UL-listed through-penetration firestop assemblies (Hilti / 3M / STI) for MEP plumbing, conduit, and duct penetrations crossing fire-rated floor/wall barriers under ASTM E814 & UL 1479: calculate required F-Rating (flame barrier hours) and T-Rating (temperature limit to 325°F above ambient on unexposed side), intumescent sealant depth, and firestop contractor profits.

1. Project & Operating Inputs

MEP Penetrations Sealed & Tagged (Penetration Count e.g. 450 Penetrations)

Average Annular Space Gap (Inches e.g. 1.0" Annular Seal Gap)

Customer Bid Price for Supplied, Packed & Caulk Sealed Firestop ($ / Unit)

Mineral Wool Backing, UL Intumescent Sealant, Firestop ID Tags & Tech ($)

2. Financial Breakdown & Yield

UL 1479 THROUGH-PENETRATIONS

Turnkey Firestop Package Contract Profit

Certified Firestop Contractor Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost