ASTM_D_7586_-_D_7586M_-_11.pdf

Designation:D7586/D7586M11Standard Test Method forQuantification of Air Intrusion in Low-Sloped MechanicallyAttached Membrane Roof Assemblies1This standard is issued under the fixed designation D7586/D7586M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method provides a laboratory technique fordetermining the air intrusion in low-sloped mechanicallyattached membrane roof assemblies under specified negativeair pressures differences.1.2 This test method is intended to measure only airintrusion associated with the opaque roof assembly free frompenetrations such as those associated with mechanical devices,roof junctions,and terminations.1.3 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.1.4 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 determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D1079 Terminology Relating to Roofing and WaterproofingE283 Test Method for Determining Rate of Air LeakageThrough Exterior Windows,Curtain Walls,and DoorsUnder Specified Pressure Differences Across the Speci-menE631 Terminology of Building ConstructionsE2357 Test Method for Determining Air Leakage of AirBarrier Assemblies3.Terminology3.1 For definitions of general terms relating to roofing andbuilding construction used in this test method,refer to Termi-nologies D1079 and E631.3.2 Definitions of Terms Specific to This Standard:3.2.1 air intrusionthe mechanism by which indoor airenters into a roof assembly but does not escape to the exteriorenvironment.3.2.2 air leakagethe movement/flow of air from oneenvironmental condition to the other environmental conditionthrough the building envelope assembly which is driven byeither positive or negative pressure differences,or both acrossthe envelope assembly.3.2.3 extraneous leakage,L/s(ft3/min)the volume of airflowing per unit time into the bottom test chamber due to itsleakiness,under a pressure difference.3.2.4 flow rate,L/sthe volume of air flow per unit time.3.2.5 specimen air intrusion,L(ft3)the volume of airintruding into the membrane assembly specimen under a testpressure difference.3.2.6 test pressure difference,Pa(lbf/ft2)the specifieddifference in static air pressures across the membrane assemblyspecimen.3.2.7 standard conditionsdry air at a pressure of 101 kPa(29 in.Hg),temperature of 21C(69F)and air density of 1.2kg/m3(0.075 lb/ft3).4.Summary of Test Method4.1 The test consists of installing a mechanically attachedmembrane assembly specimen between two chambers;specifi-cally an airtight bottom chamber into which air flows and a topchamber that exhausts air at a rate required to maintain thespecified negative pressure across the membrane assemblyspecimen.The resultant air intrusion into the membrane1This test method is under the jurisdiction ofASTM Committee D08 on Roofingand Waterproofing and is the direct responsibility of Subcommittee D08.20 onRoofing Membrane Systems.Current edition approved March 1,2011.Published March 2011.DOI:10.1520/D7586_D7586M-11.2For 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 assembly specimen is measured from the airflow measurementsystem installed on the bottom chamber.5.Significance and Use5.1 This test method can be useful in understanding theresponse of low-sloped mechanically attached membrane roof-ing assemblies to air pressure differences induced across theassembly.5.2 This test method can be useful in understanding the roleof different roofing components in providing resistance to airintrusion into the membrane roofing assembly.5.3 When applying the results of tests by this test method,note that the performance of a roof or its components,or both,may be a function of proper installation and adjustment.5.4 This test method subjects the roof specimen to negativestatic pressures,as it is difficult to simulate the complexenvironmental conditions that can be encountered in service,including rapidly changing pressures due to wind gusting.5.5 This test method does not purport to establish all criterianecessary for the cons