The team are feeding into the Construction Innovation Hub's Assurance Framework and will be using the Hub's digital assurance tools to support the demonstrator's assurance and governance. Keith Waller, Programme Director for the Hub, is part of the PBBS Advisory Group.
Together, the PBBS project team will:
- Evidence lower in-use carbon, targeting a 30% operational reduction – based on integrated radiant heating and cooling systems within the structure, which use convection and radiation of surfaces through thermal massing (the ability for a material to store heat) as a more energy efficient alternative to traditional heating and cooling systems. In-use carbon will be reduced even further through the data-driven selection of the most airtight and efficient facades – reducing wasted energy further through both air-tightness and conduction properties.
- Generate a 50% saving in embodied carbon by using an offsite manufactured concrete structural system made from an optimised, low-carbon concrete mix. When factoring in the re-usable and demountable nature of some of these offsite manufactured concrete structural systems, this increases to a 70% carbon saving.
PBBS will streamline the end to end project delivery process providing further improvement in productivity above Laing O'Rourke's DFMA benchmark of 60% improvement in productivity through further reductions in effort.
Importantly, it will unlock efficiencies in every part of the process, reducing the time and resources needed for every aspect of a construction project: design, costing, planning, manufacturing, transport and final installation on site.
Headline time and productivity improvements include:
- Manufacturing – 40% reduced lead time and 25% labour saving
- Design – 50% reduction in effort
- Assembly – 30% saving in time and labour
The project has seen a 40% reduction of lead time in the manufacturing phase, against a target to reduce onsite building time by 30%. For example, for the bathroom pods, the team has managed to create a factory manufactured product that saves two weeks during fit-out. On the demonstrator, the bathroom pods were installed in 30 minutes, from truck to final position. The team has also assessed how to manufacture the most effective hybrid walls. Tested on Trinity School, the team found that previous lattice solutions to wall frames took 18 weeks and two days, whilst PBBS’s frame takes 11 weeks and four days - a 50% time saving just for frames.
Department for Education has been involved throughout the investment, and its output specifications and scheduled training is included in PBBS’s strategy and toolkit. To support the buying and construction of future school buildings, the team has developed DfE standards for ease of procurement.