7 Ways to Determine a Building’s Construction Type – wikiHow

Steps Method 1 of 7: Overview for Assessing Construction Type

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Classification: Frame construction is ISO Class 1. ISO Class 1 encompasses IBC Type VA and IBC Type VB. Regardless of whether the IBC classification is A (protected) or B (unprotected) the ISO Class is 1.

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Classification: Joisted Masonry construction is ISO Class 2. ISO Class 2 encompasses IBC Type IIIA and IBC Type IIIB. Regardless of whether the IBC classification is A (protected) or B (unprotected) the ISO Class is 2. IBC Type IV is Heavy Timber construction and is considered ISO Class 2. The reason is that the heavy timbers perform well and do not fail early in a fire.

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Classification: Light Noncombustible construction is ISO Class 3. ISO Class 3 encompasses IBC Type IIB (unprotected).

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Classification: Masonry Noncombustible construction is ISO Class 4. ISO Class 4 encompasses IBC Type Type IIA (protected).

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Classification: Modified Fire Resistive construction is ISO Class 5. ISO Class 5 encompasses IBC Type IB.

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Classification: Fire Resistive construction is ISO Class 6. ISO Class 6 encompasses IBC Type IA.

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Both pre- and post tensioned concrete units have steel cables installed in the concrete to provide tensile strength. With pre stressed concrete units, builders pull the cables tight before pouring the concrete and release them as the concrete cures. With post tensioned concrete units, builders pull one end of the cable tight after pouring the concrete.

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7 Ways to Determine a Building's Construction Type - wikiHow