(1) As used in this subchapter, the following definitions apply:
(a) "Accessory structure" means a building or structure utilized for sheltering equipment or materials, or for other uninhabitable occupancy purposes.
(b) "Approved" means acceptable to the code official or authority having jurisdiction.
(c) "Department" means the Department of Labor and Industry.
(d) "Fire-resistance-rated construction" means the use of methods, materials, and systems in the construction of a structure to provide against the spread of fire within a structure and to or from a structure to the outside environment.
(e) "Ignition-resistant building material" means a type of building material that resists ignition or sustained flaming combustion.
(f) "International Building Code" means the International Building Code (IBC), adopted by ARM 24.301.131.
(g) "International Residential Code" means the International Residential Code (IRC) adopted by ARM 24.301.154.
(h) "Noncombustible" means a material that is either a material of which no portion will ignite and burn when fire is applied to it, or a material that has a structural base of noncombustible material with surface materials not in excess of 1/8 inch in thickness, which has a flame spread index of 50 or less.
(i) Any material conforming to ASTM 136 shall be considered noncombustible.
(ii) "Flame spread index" refers to the index obtained from tests conducted in ASTM E 84 or UL 723.
(i) "Wildland-Urban Interface" (WUI), means the line, area, or zone where structures and other human development meet or intermingle with undeveloped wildland or vegetative fuels.