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Where the existing stud wall cavity that is part of the thermal envelope is exposed during the alteration, such exposed cavities between framing members shall be filled with insulation having a minimum nominal value of not less than R-3/inch or filled to the minimum prescriptive insulation requirement in Table R402.1.2 or Table C402.1.3 of the VECC.
Exception: Where less than 60 square feet (5.574 m2) of the existing stud cavities that are part of the thermal envelope are exposed.

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