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Building materials and systems shall comply with the requirements of this section.
3401.4.1 Existing Materials
Materials already in use in a building in compliance with requirements or approvals in effect at the time of their erection or installation shall be permitted to remain in use unless determined by the building official to be unsafe per Section 116.
3401.4.2 New and Replacement Materials
Except as otherwise required or permitted by this code, materials permitted by the applicable code for new construction shall be used. Like materials shall be permitted for repairs and alterations, provided no hazard to life, health or property is created. Hazardous materials shall not be used where the code for new construction would not permit their use in buildings of similar occupancy, purpose and location.
3401.4.3 Existing Seismic Force-Resisting Systems
Where the existing seismic force-resisting system is a type that can be designated ordinary, values of R, Ω0, and Cd for the existing seismic force-resisting system shall be those specified by this code for an ordinary system unless it is demonstrated that the existing system will provide performance equivalent to that of a detailed, intermediate or special system.

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