A proposed new ASTM International standard will address an important aspect of designing this kind of roofing: determining the proper roofing and waterproofing membrane for a particular system.
The ongoing focus on sustainability in construction has contributed to greater
interest in vegetative, or green, roof systems, in which traditional roofing
material is replaced or supplemented with vegetation. A proposed new ASTM
International standard will address an important aspect of designing this kind
of roofing: determining the proper roofing and waterproofing membrane for a
The proposed new standard, ASTM WK29304, Guide for Selection of
Roofing/Waterproofing Membranes for Vegetative Roof Systems, is currently being
developed by Subcommittee D08.24 on Sustainability, part of ASTM International
Committee D08 on Roofing and Waterproofing.
“An effective or suitable membrane for a vegetative roof system will
satisfy both the roofing and waterproofing requirements and functions for the
building and also be an effective substrate that promotes the healthy growth and
successful function of the vegetative roofing system,” said Michael Sexton,
senior systems engineer, Firestone Building Products Co., and leader of the task
group developing the proposed new standard.
According to Sexton, a suitable roofing and waterproofing membrane will
resist damage to the building’s roof envelope from common conditions such as
excessive roof traffic, membrane abrasion and impact, plant root penetration,
ultraviolet damage, exterior fire, thermal shock and wind events. In addition, a
proper membrane would comply with local, state and federal building codes and
meet the industry’s test approval standards.
“The growing move towards preserving our environment and reducing the
effects of the urban heat island has encouraged many building owners and
communities to select vegetative roofs,” Sexton said. “As such, each and every
component plays an important role in the success, not only of the roofing, but
to maintain and enhance the building envelope performance. The proper selection
of a waterproofing barrier for the roof is critical to the success on both
Sexton said that all interested parties are invited to participate in the
development of WK29304. He also noted that D08.24 is working closely with ASTM
Committee E60 on Sustainability on topics of mutual interest for
For more information, visit www.astm.org.