![]() Class 3, Non-Combustible: A building is classified as non-combustible if its exterior walls, floors, and roof are made of, and supported by, non-combustible or slow-burning materials such as metal, asbestos or gypsum.Load-bearing walls may be clad with stucco, brick veneer or another non-combustible material. The floors and roof are combustible, consisting partly or entirely of wood. Class 2, Joisted Masonry: A joisted masonry building has non-combustible exterior walls made of masonry material, such as concrete block, stone, brick, or adobe.The roof is generally made of wood decking topped with wood or composition shingles. Frame buildings often consist of a wood interior clad with stucco, or with brick or stone veneer. Class 1, Frame: Buildings are classified as frame construction if their exterior walls are made of wood or some other combustible material.
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