This session will showcase a range of ZNE residential projects, including new single-family homes, existing homes retrofitted to achieve ZNE, and multifamily buildings. The presenters will discuss the roles and relative importance of team, process, design, and technology in achieving their results. They will also present energy use data.

In 2011, Somerville launched a city-wide residential energy efficiency program aimed at a difficult-to reach demographic: middle income rental properties. Efforts to reduce residential energy consumption with its dense population required numerous alliances: utility leaders, a banking institution, and consultants worked closely together. Over 60% of Somerville households are occupied by tenants; renter/owner roadblocks were addressed. This presentation will examine municipality, utility and resident collaborations necessary to make such a program succeed.

The use of utility bills to benchmark building performance is a critical first step in any approach to energy conservation. However, utility bills can only tell you so much about how to improve building performance. Five multifamily buildings received circuit level electricity, temperature, and CO2 monitoring equipment. The data identified inefficient mechanical designs, incorrect installations, poor maintenance and individual apartments with high energy use. We will review what we measured and what we learned, including energy savings as a result of this monitoring strategy.

This session will look at the basic shapes of aluminum and fiberglass products used for frames, and identify the basic principles to be used to develop functional details for both new and retrofit construction. We will isolate the heat, air, and water control layers in windows and connect those in precast, solid masonry, and framed walls. Issues of structural support, construction sequencing, building movement, and high humidity interiors will be addressed. Numerous examples and case studies rich with photographs and drawings will be used.

Central ventilation systems in multifamily buildings are a vital building system that often compromises overall building performance (ie they don’t perform to code almost 100% of the time). Correcting ventilation problems can produce significant energy savings in multifamily buildings while also improving occupant comfort and health. Central ventilation system restoration is an emerging energy retrofit that has had its bumps along the way.

Do you understand moisture dynamics? Do you have a comprehensive plan to control moisture in your buildings? If you answered no to either question, then you run the risks of occupant discomfort, mold growth, excessive maintenance and/or premature building failure. This session will help you avoid these risks. A veteran building scientist and co-author of the EPA Moisture Control Guide will share key measures—from design through operations—for controlling water and moisture in buildings.

The role of a building's structure, and of the structural engineer, in achieving sustainability goals is frequently marginalized. Yet it represents a majority of a new building project's material mass and embodied energy, and is responsible for a large portion of its CO2e emissions. It can also play a role in the annual energy usage of a building, both in good ways (i.e. thermal mass) and bad (i.e. thermal bridging).