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Presenter: John D. Wagner, AIA, BECxP, CxA+BE

Abstract: This session examines the role of thermal bridges in contemporary energy code compliance and enclosure performance evaluation. In Illinois, the recently adopted 2024 International Energy Conservation Code and ANSI/ASHRAE/IES 90.1-2022 introduce provisions requiring quantification of heat loss associated with enclosure interfaces, attachments, and structural penetrations. In jurisdictions adopting these model codes, projects must account for thermal bridges within prescribed compliance pathways. As a result, compliance increasingly depends on the effective thermal performance of constructed details rather than solely on nominal assembly U-values indicated in design documentation. Thermal bridges are widely recognized by practitioners, yet their impact is frequently underestimated as a source of energy underperformance in building enclosures. This presentation introduces architects to the principles of thermal bridging, its effect on enclosure performance, and the process of derating assemblies to account for these conditions. The discussion examines common enclosure details, including slab edges, parapets, fenestration interfaces, cladding attachments, and roof to wall transitions. Participants will learn how linear and point thermal bridges influence effective U-values and how these impacts are evaluated under contemporary energy codes.

Emphasis is placed on identifying high-risk details, understanding documentation and calculation requirements, and recognizing how performance verification supports compliance during design and construction. Case-based examples guide participants through the derating of representative assemblies and demonstrate how early technical evaluation and interdisciplinary coordination reduce performance risk while preserving architectural intent. The session situates thermal derating within the context of evolving architectural practice, where collaboration with enclosure specialists and commissioning providers is increasingly necessary to demonstrate compliance to authorities having jurisdiction. By clarifying thermal derating requirements, the course reinforces the importance of building science literacy, constructability, and measurable performance outcomes during design development and construction documentation. It is relevant to architects and specialists engaged in both new construction and renovation projects and reflects the rising expectation that project teams deliver code-compliant, durable, and energy-efficient buildings.