ATLANTA – Five proposed addenda to Standard 189.1-2009, Standard for the Design of High-Performance, Green Buildings Except Low-Rise Residential Buildings, were opened for public comment. Requirements to reduce heat and subsequent energy use on building sites are proposed for the green building standard developed by the American Society of Heating, Refrigerating and Air-Conditioning Engineers, Illuminating Engineering Society of North America (IES) and the U.S. Green Building Council (USGBC).

Addendum k updates portions of section 5 to improve requirements related to tree-growth rate and adds a mandatory requirement restricting invasive plants. The change extends the tree growth period to 10 years from five years.

Addendum n improves the heat island reduction provisions in sections 5 to include aged values for solar reflective index and to include a reference to the Cool Roof Rating Council ANSI Standard. It also modifies the solar reflectance and emittance values in Normative Appendix D (Performance Option for Energy Efficiency).

Both addendum k and n are open for public comment until June 20.

Addendum l updates portions of section 5, treating porous pavers and open graded aggregate, all of which mitigate the heat island effect, separate from other paving materials.

Addendum m clarifies condensate collection requirements in Section 6 (Water Use Efficiency), exempting dry climates where little if any condensate would be expected from air conditioning units.

Addendum o adds a mandatory requirement to section 5.3 (Site Sustainability) to provide pedestrian-friendly environments through the use of designated walkways.

Addenda l, m, and o were open for public comment until June 5.

For more information or to comment, visit

Publication date:06/06/2011