With the changes to the codes and the advances of building products, the responses are not always as anticipated. And whether it is the roof’s insulation, a window’s Solar Heat Gain Coefficient, the walls air barrier, or the foundation’s vapor retarder we need to be confident that these items will perform as intended as a cohesive assembly while satisfying the stringent energy and fire code requirements. Whether the energy takes on the form of thermal convection, radiation, air leakage, molecular vapor diffusion, or bulk water, the building envelope must be designed and constructed properly to ensure that it responds accordingly. The Building Envelope is the shield that surrounds and protects the entire building by controlling the flow of energy between the inside and outside environments. No other statement may be better suited to summarize our ever-changing construction industry. With every code adoption cycle, building and energy codes are updated as a response to our improved knowledge and understanding of the Building Sciences, or how buildings respond to their environment. The codes of today are not the same as they were 25, 10, or even 5 years ago, and neither are the available building materials or manufactured products. Therefore, how we design, detail, and construct our buildings, especially the building envelope, also needs to change.
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