This code change proposal includes measures designed to improve building energy performance through envelope-related updates, like requiring vestibules for certain buildings (both new construction and additions) with high-traffic main entrances in all climate zones.
This CASE Report will focus on three measures that are grouped into the 'Envelope' category of building systems. These three measures work in conjunction to reduce the total amount of heat transfer that occurs in a building from the conditioned inside air to the outside ambient air.
This measure targets the thermal performance of the building envelope, including a high-performance building envelope package of evaluating and developing prescriptive code requirements for roofs constructed as cathedral ceiling, evaluating savings potential and cost-effectiveness for cool roofs with higher reflectance and thermal emittance values, high-performance windows as prescriptive in some climate zones, and increasing mandatory wall insulation.
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