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A C-2 Insulation and Acoustical license (16 CCR §832.02) covers both thermal insulation (attic, wall, and duct insulation) and acoustical material installation (suspended ceiling grids, sound-attenuating wall panels) — two related trades most C-2 contractors specialize in, though the license covers both. Most jobs are built to California’s Title 24 Energy Code Part 6 minimums, which vary by climate zone. This course covers the CSLB-outline C-2 trade exam plus the Law & Business exam every classification requires: a full study guide, 4 practice exams, and an explanation for every answer. Read the full C-2 License Guide for licensing requirements, bond amounts, and the exam content breakdown.