Most urban infrastructure was not designed for shorter duration storms that yield torrential downpours. Hard surfaces including roofs cause stormwater to pool rapidly, creating floods. Green roofs can mitigate some of this effect, and a similar approach known as “blue roofs” can accomplish the same without using vegetation.
A blue roof system stores rainwater and slowly releases it using flow-control devices or structures including customized trays and existing building risers that cause water to dam up. Together, they collect and then slowly release rainwater, allowing municipal drains and stormwater piping to keep up with heavy volume pressure.
Blue roofs typically retain more water than green roofs and are particularly beneficial in commercial/industrial zones. Stored water also provides buildings with a cooling effect through evaporation, and the collected water can be made available for reuse.
Related Stories
Codes and Standards | Nov 30, 2017
Asheville, N.C. rezoning favors pedestrians, could change city’s character
Focus is on layout and look of new buildings rather than use.
Codes and Standards | Nov 29, 2017
Many New York City landlords have not addressed new flood codes
City revised building codes after Superstorm Sandy, but many owners not required to upgrade.
Codes and Standards | Nov 28, 2017
Nail-Laminated timber Canadian design and construction guide released
Includes practical strategies and guidance with lessons from real-life projects.
Codes and Standards | Nov 27, 2017
New standard to monitor building sealing performance
Increased understanding of how materials act when stretched and compressed is the goal.
Codes and Standards | Nov 27, 2017
Denver voters approve green roof mandate
Buildings of 25,000 sf or larger required to install vegetative roof or PVs.
Codes and Standards | Nov 21, 2017
USGBC adopts ‘RELi’ resilient building and design standard
The standard prescribes methods for designing more resilient buildings and communities.
Codes and Standards | Nov 21, 2017
Updated material transparency web site and hazardous building materials list unveiled
Improved versions of tools aimed at use of healthier construction supplies.
Codes and Standards | Nov 16, 2017
White roofing isn’t always the best choice
Adverse effects include heat reflection onto nearby walls.
Codes and Standards | Nov 15, 2017
U.S. finalizes tariffs on Canadian softwood lumber
The duties would add 20% or more to cost if trade negotiators can’t find common ground.
Codes and Standards | Nov 15, 2017
NBI stretch code a tool for accelerating efficiency standards
It provides a strategy to leapfrog minimum code requirements.
