Energy Retrofit Standard Gets Revamp


Processes and procedures for retrofitting residential and commercial structures to improve energy efficiency is the focus of a newly revised joint standard.

ANSI/ASHRAE/IES Standard 100-2015, Energy Efficiency in Existing Buildings, is designed to provide better guidance and a more comprehensive approach to retrofitting, according to ASHRAE. The standard was last published in 2006.

“The total primary energy used in both residential and commercial building sectors is expected to […] rise each year for the next several decades in spite of aggressive efficiency improvements in new construction,” said Rick Hermans, chairman of the committee that wrote the standard.

“In order to reduce the overall impact of energy used by residential and commercial buildings, the existing building stock must become more efficient. This revision to Standard 100 provides the means to accomplish that goal.”

Key Features

The revised standard addresses single- and multiple-activity buildings with variable occupancy periods and identifies the approach for 53 building types in 17 climate zones/subzones.

The document directly addresses "a building’s energy efficiency in a quantitative manner and provides a means to improve that efficiency with an objective benchmark" created with the help of the U.S. Energy Information Administration, Federal Energy Management Program, and Oak Ridge National Laboratory.

Recognizing that the actual occupancy of the building plays a role in how it performs, the standard also establishes the need for energy management plans as well as operation and maintenance programs.

The standard also discusses requirements for ongoing commissioning.

Appendices include life-cycle cost analysis procedures and identification of potential energy-conservation measures.

Embracing a New Paradigm

The revision embraces a new paradigm for energy-conscious design, construction and operation of buildings, according to Hermans.

The revision brings the standard in line with other published ASHRAE documents, the organization said.

More information:


Tagged categories: ASHRAE; Building Envelope; Building envelope; Certifications and standards; Energy codes; Energy efficiency; North America

Join the Conversation:

Sign in to our community to add your comments.