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Title 24 requires the installation of a High Performance Attic as describe in Section 150.1 of the Standards.  You need to add either R-6 (tile roof) or R-8 (other roofs) for the exterior insulation, or R-13 (tile roof) or R-18 (other roofs) for the interior insulation in the JA4 tab of the construction assembly editor.  In addition, you must have the cavity insulation at R-38 or higher.


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