An unventilated attic (sometimes referred to as a sealed attic) is created in the Assembly Editor by first importing an Attic assembly with R-0 insulation using the green Import button. At the Res T24 Performance tab, check the box for Unventilated. Now input whatever level of insulation you have at the rafters under the Below Roof Deck entry.
Note if using this assembly for Prescriptive compliance, the entry in the JA4 tab for Interior Insulation should be included.
← How do I create an Unventilated Attic?