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Tighter envelope tables in 2024 code could affect steel/metal buildings, board says
Summary
Board members said the 2024 IECC reduces allowed U-factors and raises R-values for many assemblies, which could force thicker continuous insulation and new attachment systems that complicate pre-engineered metal building designs.
Members highlighted that the 2024 IECC reorganized and tightened U-factor and R-value tables, increasing prescriptive requirements for walls, roofs and slab edges. "All of the tables, values for the U factors, went down, and all of the R values on the R value table went up," one presenter noted while showing the revised tables.
Contractors and architects warned that commercial metal buildings and pre-engineered systems could struggle to meet prescriptive paths without adding thicker continuous insulation or adjusted cladding and attachment details. The board discussed trade-off compliance paths (simulated performance or ASHRAE) versus prescriptive methods and asked staff to flag which assemblies would be most affected in local projects.
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