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California Firestop
Dually UL Qualified and Factory Mutual certified firestop contractor.
Top companies · October 2026
California Firestop is a specialty firestopping and construction-safety contractor serving Southern California and Arizona. Its site states that it is certified as a UL Solutions Qualified Firestop Contractor and a Factory Mutual firestop contractor, and carries California licence number 991135. Work covers through-penetration firestopping, joints and head-of-wall conditions on commercial projects. It publishes offices at Oceanside, Corona and Tempe.
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Head office
Oceanside, California
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Inland Empire
Corona, California
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Arizona
Tempe, Arizona
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