CIVL439/WO0D476 Global Warming Potential Embodied Energy (EE) (GWP)】 of C( a the producti n5em0 whousthan sheet er than sheet metal and Toxicity Index Toxity Index cont'd en9an8830 y,the w g ithin the ac 画 g Weighted Resource use Weighted Resource use cont'd The weighted resource use is a The weighted resource use for wood is 14%less than sheet metal and raction an 03% ess than concrete ecological carrying capacity CIVL439/WOOD476 4 Embodied Energy (EE) • EE is a measure of the total direct and indirect energy used during the extraction, processing, manufacturing, transportation and installation of the materials from raw material to the final product in the house • EE for the wood house is 53% less than sheet metal and 120% less than concrete Global Warming Potential (GWP) • GWP is referenced by greenhouse gas emissions measured in the form of CO2 or equivalent amount of CO2 for other greenhouse gases. This measurement includes the emission of CO2 during the production process, such as steel making or cement production • GWP of wood is 23% lower than sheet metal and 50% lower than concrete Toxicity Index • The toxicity indices are represented by an estimation of the volume of air or water needed to dilute the contaminated air or water emitted during the various life cycle of the material to within the acceptable l ld f db h level defined by the most stringent standard (such as meeting the drinking level standards) Toxity Index cont’d • The air toxicity index for the wood house is 74% less than sheet metal and 115% less than concrete • Similarly, the water toxicity index for the wood house is 247% less than sheet metal and 114% less than concrete Weighted Resource use • The weighted resource use is a subjective measure based on survey of resource extraction and environmental specialists to develop subjective scores of the relative effects or ecological carrying capacity of different resource extraction activities Weighted Resource use cont’d • The weighted resource use for wood is 14% less than sheet metal and 93% less than concrete