So in utility and policy circles, electrification is all the rage. Grid electricity is getting cleaner (i.e. resulting in lower CO2 emissions), on-site renewables are taking off (sometimes even with storage), and heat pump technologies are getting better. More regional and utility initiatives are encouraging building owners/designers/developers to forego onsite fossil fuels entirely (or at least mostly) to help meet CO2 emission reduction goals. But is electricity really more sustainable than natural gas? Is it cheaper? Which is better, really?
Walking the aisle of your favorite home improvement store, you’ll notice the wide array of options for very efficient light fixtures. Don’t be fooled – truly efficient lighting design is achieved through thoughtful layout and proper controls.
A high performance building warrants an efficient lighting strategy. With so many efficient LED fixtures available on the market, individual fixture efficiency is rarely an issue. However, these fixtures are often placed in high concentrations or at a higher wattage than necessary to adequately illuminate a space. The result is high lighting power density (LPD), which is measured by dividing the total light fixture wattage in a room by the square footage of that room. Even with controls such as occupancy or vacancy sensors, high LPDs are especially energy intensive in frequently occupied common areas, e.g., corridors and lobbies of multifamily buildings, impacting the bottom line efficiency of all buildings.
Projects pursuing Passive House certification are impacted by an optimized lighting scheme more so than a code-built building. As the heating and cooling energy used in a Passive House building decreases due to an excellent thermal envelope, the ratio of lighting energy used increases. Reducing lighting energy use can drastically improve the building’s overall primary energy demand. Read more
It is safe to say we are in a climate crisis. Of the last 17 years, 16 have been the hottest on record. Sea level is expected to rise by as much as eight feet by the end of the century. And by 2050, as many as 140 million people will have been displaced by climate change. The time to act is now, and a major area of impact is buildings, which account for 40% of carbon emissions in the United States. Better envelopes, lighting, and mechanical systems are helping buildings become more efficient, which means an increasing proportion of carbon—up to 68% of a building’s lifetime emissions—is locked up in materials. This “embodied” carbon gets released during a material’s extraction, manufacture, transport, maintenance, and, eventually, disposal.
If our industry is to meet the 2030 Challenge of carbon neutrality by the close of the decade, we will need to reevaluate building materials and select low-carbon alternatives.
Figure 1: Courtesy of Faithful+Gould
A team of SWA consultants recently had the opportunity to tour the newly constructed Delos Office Headquarters, located in the Meatpacking District of New York City. The office, which occupies the fourth and fifth floors of a ten-story building adjacent to the High Line, has obtained WELL Platinum certification through the International WELL Building Institute (IWBI), Petal Certification through the Living Building Challenge, and is currently pursuing LEED v4 Platinum certification through the US Green Building Council (USGBC). From the inception of the tour, it was clear that the space had exceeded the expectations of these certifications, and more.
Stepping off the elevator, occupants walk over a large metal grate designed to remove debris from shoes, preventing dirt and other particles from contaminating the floor. Then, upon entering the office, visitors are immediately greeted with an abundance of natural light and sense of biophilia. The office is enclosed by large glass curtain walls and filled with an array of plant life. Next to the entrance, a large monitor displays office conditions, such as temperature, humidity, carbon dioxide, and other levels affecting tenant comfort.
The main office area is largely free address, which means employees can freely move to where they feel most comfortable. Each desk is adjustable and includes a monitor, a temperature adjustable task light, and many other utilities that foster productivity. There are greenwalls placed throughout the office (22 to be exact), which are used to purify the air. Clean air is also distributed through floor diffusers and dirty air is removed through the ceiling. Additionally, it is noticeably quiet in the office; the mechanical systems are well insulated and there is a low level white noise sound masking system that lessens harsh noises. Read more
As mentioned in Foundation Waterproofing 101, water damage to a foundation can be very costly and difficult to repair. By paying close attention to how and where water might enter the foundation during the early stages of construction, typical failures can be avoided by following these simple guidelines…
For the Designer: Keys to proper installation
Design and Quality Assurance
- Don’t wait to design the foundation waterproofing system after you’re already in the ground!
- Specify and detail the appropriate system for each project. Meet with manufacturer reps early!
- Require shop drawings and kickoff meetings to ensure the entire team understands the importance of the design! Review examples of common failures.
- Get your consultants on board early: Geotechnical engineer, Structural engineer, Waterproofing/enclosure consultant.
- Review warranties, require third party inspections, installer certification, and contractor training.
For the Installer: Keys to proper installation
- Provide smooth continuous surfaces to install waterproofing – minimize jogs, protrusions, and sharp edges.
- At slabs: compacted fill/rigid insulation board/rat slabs
- At walls: fill bugholes, remove/grind concrete fins, mortar snots, fill form tie holes, verify form release agents and compatibility.