- In locations where unprotected openings are permitted
- In locations where the roof has a slope greater than 4:12 up from the back wall of the building, and when the roof covering has a Class A rating
- In locations where the exterior wall of the building is located 20 feet (6.1 m) or more from the property line, an alley, or a public way at least 20 feet (6.1 m) wide
- In buildings completely protected by an automatic fire sprinkler system that complies with NFPA Standard 13, Standard for the Installation of Sprinkler Systems
- In buildings where the roof is constructed of noncombustible or limited-combustible materials and the joint between the wall and the roof is sealed with an approved fire-stop system
- In buildings with combustible roofs (Types III, IV, and V) where all of the conditions listed in NFPA 5000, Article 126.96.36.199(6), are met
We must remember, however, that the presence of a parapet does not always indicate a firewall below. Sometimes the firewall was removed after an automatic fire sprinkler system was installed; the firewall was breached for doorways, conveyors, or unprotected ducts; or the parapet functions only as an expansion joint in the roof membrane and not as a firewall.
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