Administrative Rules of Montana
Department 24 - LABOR AND INDUSTRY
Chapter 24.321 - WILDLAND URBAN INTERFACE FIRE MITIGATION
Subchapter 24.321.3 - Wildland Urban Interface Fire Mitigation
Rule 24.321.308 - EXTERIOR AREAS
Current through Register Vol. 18, September 20, 2024
(1) In structures where the window to exterior wall area exceeds 20 percent (i.e., more than 20 percent of all exterior wall areas is comprised of exterior windows or window walls), the exterior windows, window walls, glazed doors, glazing within exterior doors, and skylights shall be tempered glass, multilayered glazed panels, glass block, or have a fire protection rating of not less than 20 minutes.
(2) Exterior doors shall be of approved noncombustible construction and materials, solid core wood not less than 1 3/4 inches thick, or have a fire protection rating of not less than 20 minutes. Vehicle access doors shall be constructed of ignition-resistant building materials.
(3) Exterior walls of buildings or structures shall extend from the top of the foundation to the underside of the roof sheathing and shall be constructed with one of the following methods:
(4) If a structure is not located in a designated WUI, this rule does not apply.
50-60-901, MCA; IMP, 76-3-504, MCA;
