5.1 This guide addresses performance characteristics for green roof systems with respect to the planting. A rooftop is an extreme environment with strong and variable wind patterns and little or no protection from the sun’s intense heat and ultraviolet radiation. Selection of plant material can be crucial for success of the green roof system.

5.1.1 This guide provides general guidance only. It is important to consult with a professional horticulturist, green roof consultant, landscape architect, or work with similar professionals that are knowledgeable, experienced, and acquainted with green roof technology and plants.

5.2 Determining these performance characteristics of green roof systems provides information to facilitate the assessment of engineering aspects of the facility. Such aspects may include structural design requirements, mechanical engineering and thermal design requirements, and fire and life safety requirements.

5.3 Determining these performance characteristics of green roof systems provides information to facilitate assessment of the performance of one green roof system relative to another.

1.1 This guide covers the considerations for the selection, installation, and maintenance of plants for green roof systems.

1.2 This guide is applicable to both extensive and intensive green roof systems.

1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and to determine the applicability of regulatory limitations prior to use.

1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.