About this appendix: Appendix D establishes a framework by which a jurisdiction can establish a portion of a jurisdiction as a fire district. Fire districts are often designated in a more densely developed portion of a city where limiting the potential spread of fire is a key consideration. Within a fire district specific construction types and users are prohibited.
Where blocks adjacent to the fire district have developed to the extent that not less than 25 percent of the ground area is built upon and 40 percent or more of the built-on area is devoted to the occupancies specified in Section D101.2.1, they can be considered for inclusion in the fire district, and can form all or a portion of the 200-foot (60 960 mm) buffer zone required in Section D101.2.2.
- Buildings of Type IV construction.
- Buildings equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1.
- Automobile parking structures.
- Buildings surrounded on all sides by a permanently open space of not less than 30 feet (9144 mm).
- Partitions complying with Section 603.1, Item 11.
Exterior load-bearing walls of Type II buildings shall have a fire-resistance rating of 2 hours or more where such walls are located within 30 feet (9144 mm) of a common property line or an assumed property line. Exterior nonload-bearing walls of Type II buildings located within 30 feet (9144 mm) of a common property line or an assumed property line shall have fire-resistance ratings as required by Table 601, but not less than 1 hour. Exterior walls located more than 30 feet (9144 mm) from a common property line or an assumed property line shall comply with Table 601.
Exception: In the case of one-story buildings that are 2,000 square feet (186 m2) or less in area, exterior walls located more than 15 feet (4572 mm) from a common property line or an assumed property line need only comply with Table 601.
Permanent canopies are permitted to extend over adjacent open spaces provided that all of the following are met:
- Any canopy covering, other than textiles, shall have a flame spread index not greater than 25 when tested in accordance with ASTM E84 or UL 723 in the form intended for use.
- The canopy shall have one long side open.
- The maximum horizontal width of the canopy shall be not greater than 15 feet (4572 mm).
- The fire resistance of exterior walls shall not be reduced.
The preceding provisions of this appendix shall not apply in the following instances:
- Temporary buildings used in connection with duly authorized construction.
- A private garage used exclusively as such, not more than one story in height, nor more than 650 square feet (60 m2) in area, located on the same lot with a dwelling.
- Fences not over 8 feet (2438 mm) high.
- Coal tipples, material bins and trestles of Type IV construction.
- Water tanks and cooling towers conforming to Sections 1509.3 and 1509.4.
- Greenhouses less than 15 feet (4572 mm) high.
- Porches on dwellings not over one story in height, and not over 10 feet (3048 mm) wide from the face of the building, provided that such porch does not come within 5 feet (1524 mm) of any property line.
- Sheds open on a long side not over 15 feet (4572 mm) high and 500 square feet (46 m2) in area.
- One- and two-family dwellings where of a type of construction not permitted in the fire district can be extended 25 percent of the floor area existing at the time of inclusion in the fire district by any type of construction permitted by this code.
- Wood decks less than 600 square feet (56 m2) where constructed of 2-inch (51 mm) nominal wood, pressure treated for exterior use.
- Wood veneers on exterior walls conforming to Section 1404.5.
- Exterior plastic veneer complying with Section 2605.2 where installed on exterior walls required to have a fire-resistance rating not less than 1 hour, provided that the exterior plastic veneer does not exhibit sustained flaming as defined in NFPA 268.
|ASTM E84—2016||Test Method for Surface Burning Characteristics of Building Materials||D102.2.8|
|NFPA 268—17||Test Method for Determining Ignitability of Exterior Wall Assemblies Using a Radiant Heat Energy Source||D105.1|
|NFPA 701—15||Methods of Fire Tests for Flame-Propagation of Textiles and Films||D102.2.8|
|UL 723—08||Standard for Test for Surface Burning Characteristics of Building Materials, with Revisions through August 2013||D102.2.8|