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California Energy Code

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Sunlit attic with newly installed R-38 insulation in a cathedral ceiling, showcasing a modern home renovation for energy efficiency.
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Remodel Your Sloped Roof Attic With This 2025 Insulation Guide

Starting in 2025, California homeowners upgrading sloped roof attic insulation, especially cathedral ceilings, must install R-38 insulation.

Luis Ortega·June 21, 2026