1 Del. Admin. Code § 702-2-3.0

Current through Register Vol. 28, No. 7, January 1, 2025

Section 702-2-3.0 - Two-Hour Rated Fire Wall (Class "B" Fire Barriers)

Note: Two-Hour Rated Fire Walls (Class "B" Fire Barriers) are utilized to sub-divide buildings that exceed 10,000 aggregate gross square feet, only where no public or private water distribution is available. See Regulation 702, Chapter 4 of this Regulation.

3.1 A Two-Hour Rated Fire Wall may be used to reduce a fire compartment within a building to the area limitations required by Chapter 4 of this Regulation, or any other part of these Regulations.

3.2 Two-Hour Rated Fire Walls shall meet the following criteria:

3.2.1 The fire wall is to be constructed in accordance with the provisions of the Standard for High Challenge Fire Walls, Fire Walls, and Fire Barrier Walls, NFPA 221;

3.2.2 The fire wall, is to be of masonry construction and is to have a two-hour fire resistance rating;

3.2.3 The fire wall is to be a cantilevered/free standing fire wall; or, a tied fire wall; or, a double fire wall;

3.2.4 Continuous through the roof and parapetted a minimum of thirty (30) inches. The parapet height shall be measured from the top surface of the roof being protected. Roofs sloped greater than 1/4 in. per ft. downward toward the wall shall be provided with a minimum thirty-six inch (36") parapet;

Exception No. 1 to 3.2.4: This wall may terminate at the underside of a noncombustible roof deck.

Exception No. 2 to 3.2.4: Exception #1 may be utilized only one time per building exceeding 10,000 square feet. Any Barrier utilized thereafter shall be parapetted per these Regulations.

3.2.5 Openings, if any, protected with a 1 1/2 hour fire rated protective assembly on both sides of the opening.

Note: Exceptions No. 1 and 2 to subsection 3.2.4. These exceptions allow the use of a Class B Barrier without a parapet in buildings up to 20,000 square feet. This type of Class B Barrier can be utilized only one time, and any additional fire barriers shall be parapetted per these Regulations.

1 Del. Admin. Code § 702-2-3.0

25 DE Reg. 74 (7/1/2021) (final)