Firewall (construction)

A firewall is a fire-resistant barrier used to prevent the spread of fire. Firewalls are built between or through buildings, structures, or electrical substation transformers, or within an aircraft or vehicle.

Applications

Firewalls can be used to subdivide a building into separate fire areas and are constructed in accordance with the locally applicable building codes. Firewalls are a portion of a building's passive fire protection systems.

Firewalls can be used to separate-high value transformers at an electrical substation in the event of a mineral oil tank rupture and ignition. The firewall serves as a fire containment wall between one oil-filled transformer and other neighboring transformers, building structures, and site equipment.

Types

There are three main classifications of fire rated walls: fire walls, fire barriers, and fire partitions.

A firewall is an assembly of materials used to delay the spread of fire a wall assembly with a prescribed fire resistance duration and independent structural stability. This allows a building to be subdivided into smaller sections. If a section becomes structurally unstable due to fire or other causes, that section can break or fall away from the other sections in the building. ^[1]
A fire barrier wall, or a fire partition, is a fire-rated wall assembly that are not structurally self-sufficient. ^[2]

Fire barrier walls are typically continuous from an exterior wall to an exterior wall, or from a floor below to a floor or roof above, or from one fire barrier wall to another fire barrier wall, having a fire resistance rating equal to or greater than the required rating for the application. Fire barriers are continuous through concealed spaces (e.g., above a ceiling) to the floor deck or roof deck above the barrier. Fire partitions are not required to extend through concealed spaces if the construction assembly forming the bottom of the concealed space, such as the ceiling, has a fire resistance rating at least equal to or greater than the fire partition.^[3]

A high challenge fire wall is a wall used to subdivide a building with high fire challenge occupancies, having enhanced fire resistance ratings and enhanced appurtenance protection to prevent the spread of fire, and having structural stability.^[4]

Portions of structures that are subdivided by fire walls are permitted to be considered separate buildings, in that fire walls have sufficient structural stability to maintain the integrity of the wall in the event of the collapse of the building construction on either side of the wall.^[5]

Characteristics

Fire rating - Fire walls are constructed in such a way as to achieve a code-determined fire-resistance rating, thus forming part of a fire compartment's passive fire protection. Germany includes repeated impact force testing upon new fire wall systems. Other codes require impact resistance on a performance basis^[6]
Design loads – Fire wall must withstand a minimum 5 lb/sq ft (24 kg/m²), and additional seismic loads.^[7]
Substation transformer firewalls are typically free-standing modular walls custom designed and engineered to meet application needs.
Building fire walls typically extend through the roof and terminate at a code-determined height above it. They are usually finished off on the top with flashing (sheet metal cap) for protection against the elements.

Materials

Building and structural fire walls in North America are usually made of concrete, concrete blocks, or reinforced concrete. Older fire walls, built prior to World War II, used brick materials.
Fire barrier walls are typically constructed of drywall or gypsum board partitions with wood or metal framed studs.
Penetrations – Penetrations through fire walls, such as for pipes and cables, must be protected with a listed firestop assembly designed to prevent the spread of fire through wall penetrations. Penetrations (holes) must not defeat the structural integrity of the wall, such that the wall cannot withstand the prescribed fire duration without threat of collapse.^[8]
Openings – Other openings in fire walls, such as doors and windows, must also be fire-rated fire door assemblies and fire window assemblies.^[9]

Performance based design

Firewalls are used in varied applications that require specific design and performance specifications. Knowing the potential conditions that may exist during a fire are critical to selecting and installing an effective firewall. For example, a firewall designed to meet National Fire Protection Agency, (NFPA), 221-09 section A.5.7 which indicates an average temperature of 800 °F (425 °C), is not designed to withstand higher temperatures such as would be present in higher challenge fires, and as a result would fail to function for the expected duration of the listed wall rating.

Performance based design takes into account the potential conditions during a fire. Understanding thermal limitations of materials is essential to using the correct material for the application. Laboratory testing is used to simulate fire scenarios and wall loading conditions. The testing results in an assigned listing number for the fire-rated assembly that defines the expected fire resistance duration and wall structural integrity under the tested conditions. Designers may elect to specify a listed fire wall assembly or design a wall system that would require performance testing to certify the expected protections before use of the designed fire-rated wall system.

High-voltage transformer fire barriers

Fire barriers are used around large electrical transformers as firewalls. These barriers are used to isolate one transformer in case of fire or explosions, preventing fire propagation to neighboring transformers.

Notes

^ NFPA 221, Standard for High Challenge Fire Walls, Fire Walls, and Fire Barrier Walls, 2009 Edition, section 3.3.14.6, NFPA 850-10 Fire Protection fotric Generating Plants and High Voltage DC Converter Stations 2010 Edition section 5.1.4.3-4
^ NFPA 221, Standard for High Challenge Fire Walls, Fire Walls, and Fire Barrier Walls, 2009 Edition, section 3.3.14.5
^ NFPA 221, Standard for High Challenge Fire Walls, Fire Walls, and Fire Barrier Walls, 2006 Edition, section 3.3.12.7
^ NFPA 221, Standard for High Challenge Fire Walls, Fire Walls, and Fire Barrier Walls, 2009 Edition, section 3.3.14.7, NFPA 850-10 Fire Protection for Electric Generating Plants and High Voltage DC Converter Stations 2010 Edition section 5.1.4.3-4
^ NFPA 221, Standard for High Challenge Fire Walls, Fire Walls, and Fire Barrier Walls, 2006 Edition, section A3.3.12.6
^ NFPA 221, Standard for High Challenge Fire Walls, Fire Walls, and Fire Barrier Walls, 2006 Edition, section 4.6
^ NFPA 221, Standard for High Challenge Fire Walls, Fire Walls, and Fire Barrier Walls, 2006 Edition, section 4.2
^ NFPA 221, Standard for High Challenge Fire Walls, Fire Walls, and Fire Barrier Walls, 2006 Edition, section 4.9
^ NFPA 221, Standard for High Challenge Fire Walls, Fire Walls, and Fire Barrier Walls, 2006 Edition, section 4.8.3

External links

FAA Regulation about firewalls in aircraft

[1] NFPA 221, Standard for High Challenge Fire Walls, Fire Walls, and Fire Barrier Walls, 2009 Edition, section 3.3.14.6, NFPA 850-10 Fire Protection fotric Generating Plants and High Voltage DC Converter Stations 2010 Edition section 5.1.4.3-4

[2] NFPA 221, Standard for High Challenge Fire Walls, Fire Walls, and Fire Barrier Walls, 2009 Edition, section 3.3.14.5

[3] NFPA 221, Standard for High Challenge Fire Walls, Fire Walls, and Fire Barrier Walls, 2006 Edition, section 3.3.12.7

[4] NFPA 221, Standard for High Challenge Fire Walls, Fire Walls, and Fire Barrier Walls, 2009 Edition, section 3.3.14.7, NFPA 850-10 Fire Protection for Electric Generating Plants and High Voltage DC Converter Stations 2010 Edition section 5.1.4.3-4

[5] NFPA 221, Standard for High Challenge Fire Walls, Fire Walls, and Fire Barrier Walls, 2006 Edition, section A3.3.12.6

[6] NFPA 221, Standard for High Challenge Fire Walls, Fire Walls, and Fire Barrier Walls, 2006 Edition, section 4.6

[7] NFPA 221, Standard for High Challenge Fire Walls, Fire Walls, and Fire Barrier Walls, 2006 Edition, section 4.2

[8] NFPA 221, Standard for High Challenge Fire Walls, Fire Walls, and Fire Barrier Walls, 2006 Edition, section 4.9

[9] NFPA 221, Standard for High Challenge Fire Walls, Fire Walls, and Fire Barrier Walls, 2006 Edition, section 4.8.3

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v t e Fire protection
Fundamental concepts	Backdraft Boiling liquid expanding vapor explosion (BLEVE) Boilover Combustibility and flammability Conflagration Dangerous goods (HAZMAT) Deflagration Detonation Dust explosion Enthalpy of vaporization Explosive Fire class Fire control Fire loading Fire point Fire triangle Flammability diagram Flammability limit Flammable liquid Flashover Flash point Friction loss Gas leak Heat transfer Jet fire K-factor (fire protection) Pool fire Pyrolysis Spontaneous combustion Structure fire Thermal radiation Water pressure
Technology	Active fire protection Automatic fire suppression Condensed aerosol fire suppression Detonation flame arrester External water spray system Fire bucket Fire prevention Fire protection Fire retardant Fire-retardant fabric Fire retardant gel Fire-safe polymers Fire safety Fire sprinkler system Fire suppression system Firefighting foam Flame arrester Flame retardant Flashback arrestor Fusible link Gaseous fire suppression Hypoxic air technology for fire prevention Inerting system Intumescent Passive fire protection Personal protective equipment (PPE) Relief valve Spark arrestor Tank blanketing Vehicle fire suppression system
Building design	Annulus (firestop) Area of refuge Booster pump Compartmentation Crash bar Electromagnetic door holder Electromagnetic lock Emergency exit Emergency light Exit sign Fire curtain Fire cut Fire damper Fire door Fire escape Fire extinguisher Fire hose Fire hydrant Fire pump Fire sprinkler Firestop Firestop pillow Firewall (construction) Grease duct Heat and smoke vent Occupancy Packing (firestopping) Penetrant (mechanical, electrical, or structural) Penetration (firestop) Pressurisation ductwork Safety glass Smoke control Smoke damper Smoke exhaust ductwork Smokeproof enclosure Standpipe (firefighting)
Fire alarm systems	Aspirating smoke detector Carbon monoxide detector Circuit integrity Explosive gas leak detector Fire alarm call box Fire alarm control panel Fire alarm notification appliance Fire drill Flame detector Heat detector Manual fire alarm activation Smoke detector
Professions, trades, and services	Duct cleaning Fire insurance Fire protection engineering Fireproofing Fire-resistance rating Fire Safety Evaluation System (FSES) Fire test Kitchen exhaust cleaning Listing and approval use and compliance Sprinkler fitting
Industry organizations	Fire Equipment Manufacturers' Association (FEMA) Institution of Fire Engineers (IFE) National Council of Examiners for Engineering and Surveying (NCEES) National Fire Protection Association (NFPA) Society of Fire Protection Engineers (SFPE) Underwriters Laboratories (UL)
Standards	CE marking EN 3 EN 54 EN 16034 Flame spread GHS hazard statements GHS precautionary statements Life Safety Code (NFPA 101) List of R-phrases List of S-phrases Safety data sheet UL 94
Awards	Arthur B. Guise Medal Harry C. Bigglestone Award
See also	Template:Fire Template:Firefighting Template:HVAC
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