This piece is taken from our newsletter "Force of Nature" see more and subscribe here.
Energiesprong ("energy leap") is an initiative launched in the Netherlands that is gaining interest around the globe. At the building level companies make prefabricated exterior wall and roof additions that can be put in place in about a week, essentially wrapping the house. The roof contains solar panels. In the Netherlands government support has been used to support the approach to social housing units with aims to have 100,000 units completed. To work economies of scale are important but homes are getting renovated right now. No word if they are using carbon sequestering materials. See videos below for more on how this works.
The Pembina Institute recently wrote about the need to retrofit B.C's housing, particularly affordable housing and cited energiesprong as one possible model to draw on. Pembina will be launching an Affordable Housing Renewal Project which aims to "demonstrate that the challenges of aging, unhealthy buildings can be addressed with a solution that is affordable, fast, and scalable, while reducing carbon pollution and helping the province meet its climate commitments."
The Energiesprong website lists France, the UK, Germany and New York State as other locations where initiatives are happening. However, this month the Rocky Mountain Institute was awarded funds for "Experimental Envelope Fabrication Process for Integrated Zero Energy Ready Multifamily Renovations."
PHIUS and the Net Zero Energy Coalition (NZEC) are partners in this project. PHIUS reports that "This grant allows RMI, PHIUS and NZEC to develop high performance building envelope assemblies for new and retrofit buildings. PHIUS will take the lead in developing retrofit standards and industry guidance for single family and multifamily homes, and will oversee monitoring, measurement, and quality assurance for prototypes and pilot projects" Katrin Klingenberg, Director of PHIUS, said "Tailoring envelope assemblies to climate zones is critical to making high performance buildings affordable and effective. “It is the most cost effective route to zero. We are excited to help in creating standards and design guidelines that make zero energy buildings possible everywhere.”
Wrapping buildings isn't a new idea, in fact we wrote about it in this newsletter awhile back. What is different here is the attempt to do it on a large scale, with full wall and roof systems, quickly so that residents can remain on site and with a focus on social housing. We will hear more about this approach in the months and years to come.
The first video below explains the basic idea of Energiesprong and the second is a video of a one day Energiesprong retrofit: