BSC - Mass Save Deep Energy Retrofit Builder Guide
DER Builder’s Guide (240 pages)
An exploration into DER concepts and the technical specifications for several common approaches to wall, ceiling, attic, basement, and slab assemblies.
Special attention is given to how a specific single assembly can be completed while providing for future DER work as part of a staged approach to a deep energy retrofit.
A high resolution version of the Mass Save Deep Energy Retrofit Builder Guide and program guidelines are also available: https://www1.nationalgridus.com/DeepEnergyRetrofit-MA-RES