| ISO-1 Frame | walls and roof
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| ISO-2 Joisted-Masonry | Concrete walls and Frame roof
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| ISO-3 Non-Combustable Metal | sometimes with concrete
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| ISO-4 Steel Frame (Masonry Non-Combustible | This risk has structural floors and roofs that are of unprotected non-combustible materials and are supported by an unprotected structural steel frame.
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| ISO-5 Protected Steel Frame (Modified Fire Resistive | A risk of this construction has structural floors, roofs and their supports are of non-combustible construction.
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| ISO-6 Reinforced Concrete Frame Fire Resistive | Risk with this type of construction have structural floors and roof and their supports that are of material such as precast or poured- in-place reinforced construction.
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