Environmental Design + Construction - October 2008 - (Page 30) Cool Roofing The NRCA Green Roof Systems Manual—2007 Edition is an excellent resource for the design and installation of vegetative roof systems. For more information, visit www.nrca.net. Most green roof systems are installed on low-slope roofs; however, it is quite possible to install green roofs on steep-slope roofs. Steepslope green roofs are generally limited to extensive systems. Installations over 2:12 or 3:12 will likely need special detailing methods. Loose-laid components will need ballast or some type of restraint to keep them from sliding down slope, and the growth medium also will need to be held in place. One very impor tant item for all par ties involved in a green roof project is a water test. NRCA recommends a water test be performed to verify the integrity of the waterproofing membrane before proceeding with subsequent construction activities. This provides an oppor tunity to correct any defects in the installation or alter details that aren’t working properly. Establishing the green roof waterproofing membrane is functioning properly prior to additional work being performed also provides a benchmark that can be used if disputes regarding functionality arise in the future. The NRCA Green Roof Systems Manual—2007 Edition is an excellent source for information regarding the waterproofing of green roof systems. I encourage roofing professionals involved with green roof system projects to use this manual as a reference tool. CR James R. Kirby, AIA, is associate executive director, technical services at the National Roofing Contractors Association. He can be reached by calling 800-3239545 or via e-mail at jkirby@ nrca.net.fg. SLATE ROOFING Call TFC We can deliver! Our NEED-IT-NOW! Trade Speci c Program provides you with fast and easy access to wide range of products and services for a speci c trade . Naturally Beautiful 14 Colors, a variety of textures Naturally Long-Lasting Proven to last 100+ years Naturally Fire-Resistant And Water-Resistant Y O U R TOTA L S L AT E S O L U T I O N READER SERVICE NO. 174 WWW.EDCMAG.COM/WEBCARD 1/18/08 9:58:04 AM CR09084EvSl.indd 1 READER SERVICE NO. 175 WWW.EDCMAG.COM/WEBCARD 7/30/08 10:05:18 AM 30 Cool Roofing > Fall 2008 RC02084Tria.indd 1 http://www.nrca.net http://www.nrca.net http://www.evergreenslate.com http://www.trianglefastener.com http://www.EDCmag.com/webcard http://www.EDCmag.com/webcard
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