ASHRAE 90.1-2007 Commercial Code (West Virginia)

Standard 90.1-2007 sets requirements for the cost-effective use of energy in commercial buildings. Certain buildings that have very low energy use, such as buildings with no heating or cooling, are exempt. Standard 90.1-2007 applies to new buildings and to alterations and additions to existing buildings.

Some of the significant requirements in Standard 90.1-2007 include:
· Stringent building insulation requirements
· Simplified fenestration requirements excluding orientation and window wall ratio
· Demand control ventilation requirements for spaces with an occupant density greater than 40 people per 1000 ft2
· Separate simple and complex mechanical requirements.

Main Differences Between the Current State Code and Standard 90.1-2007:
The 2003 was a widely adopted version of the IECC which was the first non-supplement version of the IECC to reference the newer ASHRAE standards. The reference standard for the 2003 IECC is Standard 90.1-2001.
· Lack of residential and semiheated space requirements in the 2003 IECC. (However, these are available by way of the ASHRAE reference standard, Standard 90.1-2001.)
· More climate “zones” or “bins” defined in 2003 IECC than in Standard 90.1-2007 (33 bins versus 8 climate zones).
· More stringent building envelope requirements (due in large part to having fewer climate zones) in Standard 90.1-2007.
· No differentiation of window types, as opposed to the differentiation by frame material and usage in Standard 90.1-2007.
· Less strict requirements for vestibules in cold climates in Standard 90.1-2007.
· A requirement for demand controlled ventilation in high occupancy spaces in Standard 90.1-2007.
· Fan power limitation in Standard 90.1-2007.
· Energy recovery ventilation systems in Standard 90.1-2007.
· More strict requirements for VAV fan control in Standard 90.1-2007.
· Revision of the additional lighting power allowance for retail displays to lower the allowance for some categories of merchandise in Standard 90.1-2007.
· More detailed outdoor lighting power requirements in Standard 90.1-2007.
· Potential loophole for indoor lighting power density in that Standard 90.1-2001 has the “old” lighting power densities, while Chapter 8 of the 2003 IECC has the “new” lighting power densities. (Example, “old” value for offices = 1.3 watts per square foot, “new” value for offices = 1.0 watt per square foot).

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