Firewall (construction)

Firewall residential construction, separating the building into two separate residential units, and fire areas.
Firewall, as seen on the inside of a newly constructed townhouse unit, showing how the firewall extends above the roofline.
Example of a 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 for a prescribed period of time. Firewalls are built between or through buildings, structures, electrical substation transformers, or within an aircraft or vehicle.


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.

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