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All sunrooms enclosing conditioned spaces shall meet the fenestration requirements of this code.
Exception: For sunrooms with thermal isolation and enclosing conditioned spaces, in Zones 4 through 8, the following exceptions to the fenestration requirements of this code shall apply:
  1. The maximum fenestration U-factor shall be 0.45; and
  2. The maximum skylight U-factor shall be 0.70. New fenestration separating the sunroom with thermal isolation from conditioned space shall meet the building thermal envelope requirements of this code.

Related Code Sections

R402.3.5 [RE] Residential Energy Efficiency, Sunroom Fenestration
, for sunrooms with thermal isolation and enclosing conditioned space, the fenestration U-factor shall not exceed 0.45 and the skylight U-factor shall ...