When installing ductwork in an unconditioned attic, Californ… | CaliforniaCerts

C-20 HVAC Contractor/Fabrication, Installation, and Startup/Question

When installing ductwork in an unconditioned attic, California Title 24 requires duct insulation of at least:

Home
Resources
Verification process
About
Español

Code Accuracy Commitment

Every question in our database is referenced directly against the official California codebooks. If you find a discrepancy between our materials and the printed code, we prioritize immediate review and correction to ensure you are studying the most current standards.

Verification & authorship

Our independent dual-pass review runs two separate automated checks that cross-reference every question, rationale, and code citation against the underlying California code before it is published to a live exam.