While this type of technology might seem more exciting in some respects, it isn’t necessarily as truly valuable as the data sets we could be unlocking from construction if we approached things differently and looked at other ways of using construction technology to consistently gather beneficial information from our construction sites.
Adding a heat pump would increase carbon by 3.5 kgCO2/m2.Adding insultation (rockwool) thickness in walls from 150mm to 250mm of rockwool would increase carbon by 3.6 kgCO2/m2.
Adding insultation (rockwool) thickness in floor and ceiling from 190mm to 370mm of rockwool would increase carbon by 6 kgCO2/m2.Reducing the boiler size from a 15kw electric boiler to a 3kw boiler would reduce carbon by 1.69 kgCO2/m2.Reducing the number of radiators from 10 to just one would reduce carbon by 10.7 kgCO2/m2.
Reducing the size of the photovoltaic array from 24 to 12 units would reduce carbon by 12 kgCO2/m2.All the above items added up together would mean just a reduction of around 4.7 kgCO2/m2, mainly due to the simplification of the heating and photovoltaic systems.
Compared to a residential LETI 2020 (Band C) target building (A-C) with a total embodied carbon of 675 kgCO2/m2, that is equivalent to just 0.7% reduction in carbon..
Comparison of embodied carbon (A-C) between a baseline residential building based on LETI Band C and same building with Passivhaus characteristics.http://bit.ly/BWNewsUpdatesFor pretty much forever, on-site or in-situ construction has been the default way of building.
However with accelerating interest in Design for Manufacture and Assembly (DfMA) and Modern Methods of Construction (MMC), it sometimes seems that on-site construction is falling out of favour..In 2019, the UK’s Ministry of Housing, Communities and Local Government (MHCLG) – as it was then called – published an MMC Definition Framework (see my earlier article,.
What does DfMA stand for?).This framework proposes Pre-Manufactured Value (PMV) as a metric for assessing the scale of MMC adoption on a project.