Sustainable and green building standards and codes rapidly are being developed at national and state levels. The U.S. Green Building Council recently released LEED 3.0; ASHRAE is developing 189.1,"Standard for the Design of High-Performance Green Buildings Except Low-Rise Residential Buildings"; the International Code Council (ICC) and National Association of Home Builders promulgated the National Green Building Standard for residential buildings; the ICC has begun developing a green building code for commercial buildings; and various cities and states have developed their own green building codes.
The development and implementation of these codes, which follow sustainable and green building trends in general, are driving the construction industry's product development and research. In many instances, new standards and information regarding low-slope roof system performance are needed to address the requirements being implemented. SPRI, an association representing single-ply roof membrane manufacturers and component suppliers, has taken a leadership role in addressing those needs.
Vegetative roof systems
Vegetative roof systems are gaining popularity in North America because of environmental benefits associated with them, such as: