ASTM_E_2397_-_E_2397M_-_15.pdf

Designation:E2397/E2397M15Standard Practice forDetermination of Dead Loads and Live Loads Associatedwith Vegetative(Green)Roof Systems1This standard is issued under the fixed designation E2397/E2397M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers a standardized procedure for pre-dicting the system weight of a vegetative(green)roof system.1.2 The practice addresses the loads associated with vegeta-tive(green)roof systems.Components that are typicallyencountered in vegetative(green)roof systems include:membranes,non-absorptive plastic sheet components,metalliclayers,fabrics,geocomposite drain layers,synthetic reinforc-ing layers,cover/recover boards,insulation materials,growthmedia,granular drainage media,and plant materials.1.3 This practice also addresses the weight of the vegetative(green)roof system under two conditions:(1)weight underdrained conditions after new water additions by rainfall orirrigation have ceased(this includes the weight of retainedwater and captured water),and(2)weight when rainfall orirrigation is actively occurring and the drain layer is completelyfilled with water.The first condition is considered the dead loadof the vegetative(green)roof system.The difference in weightbetween the first and second conditions,approximated by theweight of transient water in the drain layer,is considered a liveload.1.4 This practice does not address point or line loadsassociated with architectural elements that are not essentialcomponents of a particular vegetative(green)roof system.These architectural elements may include pavement,walls,andmasonry,and so forth.1.5 This practice does not address live loads associated withconstruction activities.1.6 This practice does not address loads associated withsnow or wind.1.7 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.8 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and to determine theapplicability of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2E11 Specification for Woven Wire Test Sieve Cloth and TestSievesE631 Terminology of Building ConstructionsE2114 Terminology for Sustainability Relative to the Perfor-mance of BuildingsE2396 Test Method for Saturated Water Permeability ofGranular Drainage Media Falling-Head Method forVegetative(Green)Roof SystemsE2398 Test Method for Water Capture and Media Retentionof Geocomposite Drain Layers for Vegetative(Green)Roof SystemsE2399 Test Method for Maximum Media Density for DeadLoad Analysis of Vegetative(Green)Roof Systems3.Terminology3.1 Definitions:3.1.1 For terms related to building construction,refer toTerminology E631.3.1.2 For terms related to sustainability relative to theperformance of buildings,refer to Terminology E2114.3.2 Definitions of Terms Specific to This Standard:3.2.1 captured water,nthe quantity of water that is re-tained in the drain layer of a vegetative(green)roof systemafter new water additions have ceased and that cannot escapethe roof except through evaporation or plant transpiration.3.2.1.1 DiscussionWater capture is a design technique for1This Practice is under the jurisdiction of ASTM Committee D08 on Roofingand Waterproofing and is the direct responsibility of Subcommittee D08.24 onSustainability.Current edition approved June 1,2015.Published July 2015.Originally approvedin 2005.Last published in 2011 as E2397 11.DOI:10.1520/E2397_E2397M-15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 enhancing the water holding properties of a vegetative(green)roof system.Water may be captured using a number oftechniques,including reservoirs built into a geocompositedrain layer,trays,and restricting drainage in order to holdwater within the drain layer.In some vegetative(green)roofsystems a granular course at the bottom of the vegetative(green)roof system provides both drainage and water capturefunctions.In this case the captured water applies only to thethickness of the granular course for which drainage is re-stricted.A method for determining the captured water associ-ated with geocomposites