Climate change is one of the largest threats facing the planet today. The construction industry accounts for 11% of global carbon emissions, playing a significant part in the climate crisis. To determine the best solution for future school buildings, not only does practicability, economy and constructability play a part, so does sustainability.

In order to better understand the embodied carbon emissions associated with the construction of new school buildings in British Columbia, the embodied carbon content associated with the four framing systems examples in the companion report, An Analysis of Structural System Cost Comparisons (costing study), was assessed. The purpose of this study is to allow the embodied carbon associated with these systems to become an important factor when choosing a viable scheme.

Embodied carbon is the carbon footprint of a material or product. To determine the embodied carbon of a building you must consider the quantity of greenhouse gases associated with the building. The most effective way to measure this is through Life Cycle Analysis (LCA), a study which determines the embodied carbon from cradle to grave (material extraction to building demolition). Consequently, an LCA was conducted for each of the four schemes presented in the costing study. Additionally, for wood frame Options A and B, WoodWorks online carbon calculator was used to determine the potential carbon savings associated with carbon sequestering.

As land values continue to rise, particularly in higher-density urban environments, schools with smaller footprints will become increasingly necessary to satisfy enrollment demands. There are currently several planned new school projects throughout British Columbia that anticipate requiring either three-or four storey buildings, and it is forecast that demand for school buildings of this size will continue to rise.

Though timber construction would offer a viable structural material option for these buildings, the British Columbia Building Code (BCBC 2018) currently limits schools comprised of timber construction to a maximum of two storeys, while also imposing limits on the overall floor area. Given these constraints, the development of viable structural options that would accommodate larger and taller schools constructed primarily with timber materials has not been a key focus.

With the above factors in mind, the purpose of this report is to build upon the findings of the previously published Design Options for Three- and Four-Storey Wood School Buildings in British Columbia prepared by Fast + Epp and Thinkspace dated November 2019. Specifically, this report supplements the previous one by providing guidance in assessing and comparing the various framing options considered in the previous report primarily on a cost basis.