This Construction Brief will give you an overview of ISO's Construction Class 1 – frame construction. When you've completed this course, you'll know what an ISO report means when it says a building is frame construction. And you'll understand why a particular structure is—or isn't—frame.
Buildings with exterior walls, floors, and roofs of combustible construction—or buildings with exterior walls of noncombustible or slow-burning construction with combustible floors and roofs. Frame buildings generally have roof, floor, and supports of combustible material, usually wood, and combustible interior walls.
Two variations on frame construction don't change the construction class:
- Masonry veneer (brick veneer)
- Metal clad
Masonry veneer is thin layers of brick, stone, or stucco, used for appearance purposes rather than structural support.
Other conditions that lead to classification as frame construction
- Metal walls or floors sheathed with combustible materials
- Metal floors or roofs with combustible insulation or ceiling material attached to the underside or within 18 inches of horizontal supports
- Composite assemblies of noncombustible materials with combustible materials