This includes issues such as the embedded carbon and lifecycle of products within a building, including building services – right down to the type of pipework being used. It’s estimated that embodied carbon will represent almost half of all new construction emissions all the way to 2050. So this is a crucial issue for anyone involved in the design and delivery of buildings.
Embodied carbon calculations take into account the material used to manufacture a product, as well as the carbon associated with the extraction of the material, the manufacturing process, and transport. Even repair and disposal are considered. It’s a complex area, and CIBSE has recently introduced a new guide (TM65) to help engineers work through the calculations.
Little wonder then, that specifiers are more focused than even on weighing the pros and cons of details such as plastic or metal pipes. CIBSE’s recommendations include selecting MEP plant that has long lifetimes; lower weights; and can be disassembled and recycled. But of course, these factors must be viewed in the context of system performance and efficiency too.
One of the additional challenges is that building services products are constantly in development. For example, plastic pipework has evolved to be able to withstand such high temperatures and pressures than in the past, and many installers prefer to work with this material. Metals such as steel and copper may weigh more, but offer more opportunities for recycling. It’s an additional layer of consideration for buyers, but one that is at the heart of reducing the carbon footprint of the built environment.