Greater interest in vegetative, or green, roof systems brings a proposed standard on 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 particular system.
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 fronts.”
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 more information, visit www.astm.org.