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402.2.11 Thermally Isolated Sunroom Insulation (Prescriptive)
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For sunroom additions not exceeding 500 square feet (46 m2) in area, the minimum ceiling insulation R-values shall be R-19 in Zone 4 and R-24 in Zones 5 and 6. The minimum wall R-value shall be R-13 in all zones. New wall(s), windows and doors separating such sunroom addition from conditioned space shall meet the building thermal envelope requirements of Table 402.1.1.