12B — May 27 - June 9, 2016 — Owners, Developers & Managers — M id A tlantic
Real Estate Journal
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By William Amann, P.E., DCEP, LEED Fellow Updated energy code will have big impact
T
he NJ State Depart- ment of Community Af- fairs (DCA) formally
8.7%, whereas the 2010 edition represented a 23.4% savings over 2007. So combined we should expect cost savings of about 30%. There are some slight differ- ences between South Jersey (Climate Zone 4) and North Jersey (Climate Zone 5), but both zones have changes that impact the thermal envelope, HVAC systems, lighting and lighting controls. For com- mercial buildings, the building envelope now requires R-30 in- sulation on a flat roof, and R-49 insulation in an attic. Vertical Glazing maximumU values de- creased depending on the type between 0.35 and 0.50; and the maximum Solar Heat Gain Co- efficient is 0.40. The maximum U values for skylights depend on the type and the percentage of roof area. The vertical glaz- ing is still limited to 40% of the gross wall area. Buildings exceeding this or any other prescriptive re- quirement must perform an energy model to demonstrate that the proposed design uses no more energy on an annual basis than a building designed according to the prescriptive
requirements. For buildings seeking LEED Certification, an energy model is required to demonstrate that the proposed building is using LESS energy than would a building that met the prescriptive requirements. One interesting new require- ment is the need for skylights in most spaces, if the ceiling is 15 feet high. This sounds a little strange, but really makes sense. If a space can be lit with natural light, then there is much less need for artificial light. In addition, the orienta- tion of vertical fenestration (windows) limits the quantity of east and west facing glass to each be equal to or less than ¼ of the total glass. Another new requirement is to provide a vestibule (air lock) or revolving door at all build- ing entrances. This is to reduce infiltration of outside air, which is one of the major contributors to energy use. For HVAC systems, the mini- mum efficiencies for air con- ditioners and heat pumps are typically 15% to 20% higher. The minimum efficiency level depends on the type and size continued on page 20B
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adopted the 2015 Interna- tional Energy Conservation Code (IECC) on September 21, 2015. The s i x mo n t h grace period expired on
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William Amann
March 21, 2016, so all building projects filing for permits as of that date must meet the new requirements. These new codes will have some significant im- pact on the design of new build- ings and major renovations of existing buildings. The IECC contains sepa- rate provisions for commercial buildings and low-rise residen- tial buildings. The commercial requirements are based on ANSI/ASHRAE/IES Standard 90.1 – 2013. The previous code was based on the 2007 edition, so this adoption also includes changes that occurred in the 2010 edition, which were more radical than the more recent edition. The estimated savings for the most recent revisions is
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