Frame Construction

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: