ASTM International

Over 12,000 ASTM standards operate globally. They improve the lives of millions every day. These standards enhance performance and help everyone have confidence in the things they buy and use – from the toy in a child’s hand, to the aircraft overhead, to your green roof.

Nathan Griswold, Inhabitect’s President, has played a role in ASTM’s green roof committee for over 10 years. He has worked with other members to create consensus and improve performance in manufacturing and materials, products and processes, systems and services to help ensure the continued success of the green roof market place.

ASTM’s roofing and green roofing standards are instrumental in specifying, testing, and evaluating the dimensional, mechanical, and performance requirements of various forms of roofing systems. These roofing standards are helpful in guiding product manufacturers, construction companies, architectural firms, and other producers and end-users of these parts and components in their proper fabrication and installation, as well as the possible hazards involved during these procedures. If you would like to know more about this subject contact us at

Green Roofs for Healthy Cities (GRHC)

GRHC members are invited to volunteer on a number of technical committees that provide strategic input and advice on issues, and develop new products, such as professional courses and tools. Nathan Griswold, Inhabitect’s President, has displayed his leadership within the industry by having active role on numerous committees for many years. Currently, he is the co-chair of the Advanced Green Roof Maintenance Committee. The objective of this committee is to educate green roof project stakeholders about the importance of maintenance, and to establish best practices and standard protocol for green roof maintenance. This group has also created the Advanced Green Roof Maintenance professional training course and manual.

Inhabitect believes that working with our peers to increase the knowledge base within the industry is vital to our continued growth. If you would like to know more about this subject contact us at