ASTM E814 Fire Tests of Penetration Firestop Systems: A Complete Guide

Modern commercial buildings require hundreds of penetrations through fire-rated walls and floors — pipes, cables, conduits, and ducts that pass through barriers designed to contain fire. Every one of these openings is a potential path for flames, hot gases, and smoke to travel between compartments. ASTM E814 is the standard test method used to evaluate whether firestop systems installed at these penetrations will actually hold during a fire.

This guide explains how the ASTM E814 test works, what the F and T ratings mean, how it compares to UL 1479, and what building codes require.

What Is ASTM E814?

ASTM E814, formally titled Standard Test Method for Fire Tests of Penetration Firestop Systems, is a fire test standard published by ASTM International. It evaluates the fire resistance performance of through-penetration firestop systems — the assemblies of materials used to seal openings in fire-rated walls and floors where pipes, cables, conduits, and other items pass through.

The standard was first developed in the early 1980s to address a gap in fire testing. Before ASTM E814 existed, labs were using informal variations of ASTM E119 (the general building construction fire test) to evaluate firestop materials. The dedicated E814 standard created a purpose-built test procedure specifically for penetration firestop systems.

ASTM E814 applies to firestop systems of various materials and construction types, including intumescent sealants, caulks, mortars, mineral wool stuffing, wrap strips, putty pads, cast-in-place devices, and composite sheet systems. The standard does not apply to membrane penetrations of floor-ceiling assemblies or roof-ceiling assemblies tested as part of the assembly under ASTM E119, nor does it cover membrane penetrations of load-bearing walls.

Key point: ASTM E814 tests the performance of the complete firestop system as installed — not individual firestop products in isolation. A sealant tested alone does not have an E814 rating. The system — including the specific penetrant type, size, annular space, wall or floor construction, and firestop materials — is what gets rated.

How the ASTM E814 Test Works

The test involves two sequential phases: a fire endurance test and a hose stream test.

Phase 1: Time-Temperature Fire Endurance Test

A test specimen is constructed to replicate the actual building assembly — the fire-rated wall or floor, the penetrating items (pipes, cables, conduits), and the firestop system installed per the manufacturer’s instructions. This assembly is mounted on or against a fire test furnace.
The furnace is operated to follow the standard ASTM E119 time-temperature curve, which ramps rapidly and then continues rising over time. Thermocouples are placed on the unexposed (non-fire) side of the assembly to monitor temperature transmission through the firestop system and along the penetrating items.

During the test, evaluators monitor for:
Flame passage through the firestop system to the unexposed side
Hot gas leakage through or around the firestop
Temperature rise on the unexposed side, measured at the firestop seal and along the penetrating items
The fire test continues for the target duration or until the assembly fails one of the rating criteria.

Phase 2: Hose Stream Test

After the fire endurance phase, a duplicate specimen (or in some cases the same specimen) is subjected to fire exposure for a period equal to one-and-a-half times the rated resistance period (but not more than 60 minutes). Immediately after removal from the furnace, the specimen is hit with a high-pressure water hose stream per the conditions specified in ASTM E2226.
The hose stream simulates the thermal shock and mechanical impact of firefighting operations on a fire-weakened assembly. The firestop system must prevent the passage of water through to the unexposed side. This test evaluates structural integrity — whether the firestop materials crack, dislodge, or disintegrate when subjected to sudden cooling and impact after prolonged heat exposure.
A firestop system must pass both the fire endurance test and the hose stream test to receive a rating.

Understanding F Rating and T Rating

Every firestop system tested under ASTM E814 receives two ratings. Understanding the difference between them is critical for specifying the right system.

F Rating (Flame Rating)

The F rating is the time period, in hours, during which the firestop system prevents the passage of flame through the assembly to the unexposed side. It is rounded down to the last completed hour. If a system prevents flame passage for 2 hours and 45 minutes, its F rating is 2 hours.
The F rating addresses the most basic question: will the firestop keep fire from passing through the penetration opening?

T Rating (Temperature Rating)

The T rating is the time period, in hours, during which no thermocouple on the unexposed side of the firestop system records a temperature rise exceeding 325°F (181°C) above the ambient starting temperature. This limit was carried over from ASTM E119, which allows a 250°F average rise with up to 325°F at any single point.

The T rating addresses a subtler but equally important question: even if flames don’t pass through, does the firestop system transmit enough heat to ignite combustible materials on the other side?

Why the T Rating Matters

A firestop system could have a 3-hour F rating but only a 1-hour T rating. This means flame didn’t penetrate for 3 hours, but the unexposed side got dangerously hot after just 1 hour. Metallic penetrants like steel pipes and conduits conduct heat efficiently, so temperature rise along the penetrant is often the limiting factor for T ratings.

When ASTM E814 was written, the committee made T ratings optional — temperatures would be recorded and reported separately. The intent was to provide useful thermal conductivity data. Building codes have since made T ratings mandatory in many applications, particularly where combustible materials may be in contact with or near the unexposed side of the penetration.

When T Ratings Are Required

– The International Building Code (IBC) requires T-rated firestop systems in these situations:
– Where the penetration passes through a horizontal (floor) assembly
– Where the penetration is in a wall and combustible materials are within 12 inches of the firestop on the unexposed side
– Where combustibles are not present near the unexposed side in wall penetrations, an F-rated-only system may be acceptable. Always confirm requirements with the authority having jurisdiction (AHJ).

ASTM E814 vs. UL 1479: What’s the Difference?

UL 1479 (Fire Tests of Through-Penetration Firestops) is the Underwriters Laboratories standard that parallels ASTM E814. Current building codes reference both, and the two standards are nearly identical in their core fire test and hose stream requirements. The key differences are:

F and T Ratings: Both standards produce F and T ratings using essentially the same criteria. Results from either standard are accepted by building codes.

L Rating (Air Leakage — UL 1479 only): UL 1479 includes an optional air leakage test protocol not found in ASTM E814. The firestop system is sealed in a test chamber and subjected to a pressure differential of 0.30 inches water column (~75 Pa). Airflow through the system is measured and reported in CFM per square foot of opening. Since there is no standardized test specifically for smoke passage, air leakage is used as a proxy for smoke leakage. L ratings are increasingly enforced in building codes, particularly in smoke-rated assemblies and healthcare occupancies.

W Rating (Water Leakage — UL 1479 only): UL 1479 also includes an optional water leakage test to evaluate the firestop system’s ability to resist water passage under a 3-foot pressure head. This is relevant for plumbing penetrations and wet-pipe sprinkler system penetrations where moisture resistance is required.

Canadian Standard: CAN/ULC S115 (Fire Tests of Firestop Systems) is the Canadian equivalent with very similar requirements, though hose stream performance is optional rather than mandatory. Ratings are designated as F, FT, FH, and FTH.

Practical takeaway: If your project requires only F and T ratings, testing to either ASTM E814 or UL 1479 satisfies code requirements. If you need L ratings (smoke leakage) or W ratings (water resistance), you must test to UL 1479 specifically.

Building Code Requirements for Firestop Testing
The International Building Code (IBC) is the primary reference for firestop requirements in the United States.

Key provisions include:

IBC Section 714 — Penetrations: Section 714 requires that through-penetration firestop systems be tested in accordance with ASTM E814 or UL 1479 and be listed and labeled by an approved agency. The firestop system’s F rating must be at least equal to the fire-resistance rating of the assembly being penetrated.

NFPA 101 (Life Safety Code): Reinforces firestop requirements for healthcare, assembly, educational, and high-rise occupancies, often with additional smoke compartmentation requirements that may trigger L-rated system specifications.

Listing and Certification: Building codes require firestop systems to be listed — meaning they have been tested by a nationally recognized testing laboratory (such as UL, Intertek, or ICC-ES) and published in a certification directory with specific installation details. The listing includes the penetrant type, size, annular space, wall or floor construction, firestop materials, and the achieved F and T ratings.

AHJ Enforcement: The authority having jurisdiction (local building department or fire marshal) has final authority on whether a specific firestop system meets code requirements for a given installation. Engineering judgments (EJs) may be used when no exact tested system matches the field condition, but must follow International Firestop Council (IFC) guidelines and be approved by the AHJ.
Common Firestop Systems Tested Under ASTM E814
Through-penetration firestop systems are not a single product — they are assemblies of materials designed, tested, and certified together. Common system types include:

       By Penetrant Type:

• Metallic pipe penetrations (steel, copper, cast iron)
• Plastic pipe penetrations (PVC, CPVC, ABS, HDPE)
• Electrical cable and cable tray penetrations
• Conduit penetrations (EMT, rigid, flexible)
• Insulated pipe penetrations
• Mixed penetrations (multiple penetrant types in a single opening)
• HVAC duct penetrations
  
  By Firestop Material:
• Intumescent sealants and caulks (expand when exposed to heat to seal openings)
• Endothermic sealants (absorb heat during fire exposure)
• Mineral wool or ceramic wool stuffing (used as backing/fill material)
• Intumescent wrap strips and collars (for plastic pipe penetrations)
• Firestop mortar and putty
• Cast-in-place firestop devices
• Firestop pillows and blocks (removable, re-enterable systems)
• Composite sheet systems
  
  

  Related Standards and References-

ASTM E814 operates within a broader ecosystem of fire testing and firestop standards:
ASTM E119 — Fire Tests of Building Construction and Materials (the foundational fire resistance test; E814’s time-temperature curve is based on E119)
ASTM E2226 — Application of Hose Stream (defines the hose stream test procedure referenced by E814)
ASTM E2174 — Standard Practice for On-Site Inspection of Installed Firestops
ASTM E2393 — Standard Practice for On-Site Inspection of Installed Fire Resistive Joint Systems and Perimeter Fire Barriers
ASTM E2750 — Standard Guide for Extension of Data from ASTM E814 Penetration Firestop System Tests (guidance for extending test results to untested configurations)
ASTM E3037 — Standard Test Method for Measuring Relative Movement Capabilities of Through-Penetration Firestop Systems
ASTM E176 — Standard Terminology of Fire Standards (definitions)
UL 1479 — Fire Tests of Through-Penetration Firestops (UL equivalent of ASTM E814)
UL 2079 — Tests for Fire Resistance of Building Joint Systems
CAN/ULC S115 — Fire Tests of Firestop Systems (Canadian standard)

Need ASTM E814 Fire Testing?

Infinita Lab connects you with accredited fire testing laboratories across the USA that perform ASTM E814 and UL 1479 firestop penetration fire tests. Whether you need F and T rating data for a new firestop product, certification testing for building code compliance, or engineering support for firestop system selection, our network has the specialized fire test furnace capability and technical expertise to deliver traceable, code-compliant results.

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