Editing Firewall (construction)

{{Short description|Barrier used to prevent the spread of fire through or between structures}}
{{distinguish|text=[[reredos]], a short wall behind a fire in a traditional hearth}}
{{Refimprove|date=March 2015}}
[[File:Brandwand_2.jpg|thumb|250px|Firewall residential [[construction]], separating the building into two separate residential units, and fire areas]]
[[File:Power_systems_in_Toppila_Jun2008.jpg|thumb|Example of a [[High-voltage transformer fire barriers|firewall]] used to inhibit the spread of a fire at an [[electrical substation]]]]
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 code]]s. 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==
[[File:Firewall construction 2.JPG|thumb|right|A building under construction, showing the structurally independent cinderblock firewalls subdividing the building]]
[[File:Waynesboro Outlet Village Building 4.jpg|thumb|right|Building 4 of the [[Waynesboro Outlet Village]], showing a [[concrete]] firewall running through the building]]
[[File:Waynesboro Outlet Village Building 7 after fire.jpg|thumb|right|Concrete firewalls still standing on Building 7 of the former [[Waynesboro Outlet Village]], following a firefighter training exercise which intentionally burned the building]]
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. <ref>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</ref>
*A ''fire barrier wall'', or a ''fire partition'', is a fire-rated wall assembly that are not structurally self-sufficient. <ref>NFPA 221, ''Standard for High Challenge Fire Walls, Fire Walls, and Fire Barrier Walls'', 2009 Edition, section 3.3.14.5</ref>

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.<ref>NFPA 221, ''Standard for High Challenge Fire Walls, Fire Walls, and Fire Barrier Walls'', 2006 Edition, section 3.3.12.7</ref>
*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.<ref>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</ref>

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.<ref>NFPA 221, ''Standard for High Challenge Fire Walls, Fire Walls, and Fire Barrier Walls'', 2006 Edition, section A3.3.12.6</ref>

==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<ref>NFPA 221, ''Standard for High Challenge Fire Walls, Fire Walls, and Fire Barrier Walls'', 2006 Edition, section 4.6</ref>
*Design loads – Fire wall must withstand a minimum {{convert|5|lb/sqft|kg/m2|abbr=on}}, and additional seismic loads.<ref>NFPA 221, ''Standard for High Challenge Fire Walls, Fire Walls, and Fire Barrier Walls'', 2006 Edition, section 4.2</ref>
*[[Electric substation|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 (weatherproofing)|flashing]] ([[sheet metal]] cap) for protection against [[weather|the elements]].

===Materials===
[[File:Smolina 20, Ulan-Ude.jpg|thumb|Firewalls between the old buildings in [[Ulan-Ude]]]]
*Building and [[building engineering|structural]] fire walls in [[North America]] are usually made of [[concrete]], [[concrete masonry unit|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|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.<ref>NFPA 221, ''Standard for High Challenge Fire Walls, Fire Walls, and Fire Barrier Walls'', 2006 Edition, section 4.9</ref>
*Openings – Other openings in fire walls, such as doors and windows, must also be fire-rated ''[[fire door]] assemblies'' and ''fire window assemblies''.<ref>NFPA 221, ''Standard for High Challenge Fire Walls, Fire Walls, and Fire Barrier Walls'', 2006 Edition, section 4.8.3</ref>

==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 {{convert|800|F|C|round=5}}, 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==
{{main|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.

==See also==
*[[Firewall (computing)]]
*[[Firebreak]] (forestry)
*[[Fireproofing]]
*[[Firestop]] (construction)
*[[Firewall (engine)]]
*[[Listing and approval use and compliance]]
*[[High-voltage transformer fire barriers]]

==Notes==
{{Reflist}}

==External links==
{{Commons category|Firewalls (construction)}}
*[http://www.flightsimaviation.com/data/FARS/part_121-247.html FAA Regulation about firewalls in aircraft]

{{Fire protection}}
{{Fire fighting}}

[[Category:Firefighting]]
[[Category:Passive fire protection]]
[[Category:Types of wall]]