There has become an increased awareness of the embodied carbon and the products we use in construction. A knowledgeable Owner’s representative or Project manager if part of the team can consult to benefit the project in reducing the quantity or volume of products with high embodied carbon.The amount of concrete consumed in new foundations with the increased structural requirements has a huge amount of embodied carbon due to the high temperatures required to create portland cement. Similarly, fenestrations in new buildings and homes have huge amounts of aluminum framed windows. These also have a high embodied carbon due the requirements for extracting, processing and fabricating aluminum. Below is a couple of databases that can be accessed online for free to help you measure the carbon embedded in your building.
Accessed online for free, Quartz is a “common product” database—meaning it represents the typical impacts of about 100 generic products. Profiles include not only embodied carbon numbers but also other embodied impacts (like smog-formation potential) as well as material health data (like whether the product includes carcinogens during its life cycle).
Compared with ICE, which looks at broad groups of materials like aluminum and concrete, Quartz is much more specific. Rather than aluminum, for example, it has profiles for anodized aluminum curtainwall extrusions and PVDF-coated aluminum curtainwall extrusions.
The Quartz database is rich in product information, but, like ICE, it reports data by weight rather than by functional unit. It does this, according to the website, because the “exact function, quantity, duration, and quality of the product within the building are unknown, and the installation and use phases of the life cycle are omitted.” This means you can only compare insulation products, for instance, by weight instead of by thermal performance. In order to really make comparisons, the latter is needed, and that requires WBLCA.
An add-on to One Click LCA , Carbon Designer is a sophisticated early-phase tool that allows for quick side-by-side comparisons of a baseline building (chosen by the user based on region, building dimensions, and other parameters) and a design building (produced by making changes to the baseline assumptions). It’s very much a “what if” tool: what if I altered my concrete mix, or what if I changed the type of slab I’m using? Charts show what the proposed changes would do to the embodied carbon footprint of different building assemblies.
A barrier to more widespread use of this software is that it can only be purchased as part of a package with a WBLCA tool.
As an Owner’s Representative and Project Manager I counsel the design team to try and minimize the amount of embedded carbon. I do these types of consultations in my work in Marin, Sonoma, and Napa county.Read More