1、Designation:D728107(Reapproved 2013)Standard Test Method forDetermining Water Migration Resistance Through RoofMembranes1This standard is issued under the fixed designation D7281;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the ye
2、ar of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the determination of watermigration resistance of roof membranes including built-up roofmembr
3、anes,modified bitumen,and single ply roof membranes.The procedures were developed to determine the potential forleakage of water through the roof membranes resulting from astanding head of water and when pressurized with air from theunderside.1.2 The values stated in SI units are to be regarded as t
4、hestandard.The values given in parentheses are for informationonly.1.3 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 appli
5、ca-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2G154 Practice for Operating Fluorescent Ultraviolet(UV)Lamp Apparatus for Exposure of Nonmetallic Materials3.Terminology3.1 Definitions:3.1.1 adhereto cause two surfaces to be held together byadhesion.Roof mem
6、branes are often“partially-”or“totally-adhered”to a substrate.3.1.2 battena narrow band or plate that is used to fasten orprevent the displacement of a single ply membrane.3.1.3 delaminationseparation between lamination orbonded material or component;for example,laminated layersof rigid insulation o
7、r the felt plies in a built-up roof.3.1.4 field seama splice made in the field of a single plymembrane that joins two sheets together using an adhesive,splicing tape,heat,or solvent-welding.3.1.5 mechanically fastened membranesa single ply orbase ply(part of a multi-layer system)membrane that has be
8、enpositively attached at intervals to the substrate,usually withfasteners and/or other mechanical devices,such as battens.3.1.6 NPTNational Pipe Thread.4.Summary of Test Method4.1 Roofing membranes are conditioned and installed in theleakage test apparatus(Fig.1).A152-mm(6-in.)head of wateris mainta
9、ined over the sample for 7 days at ambient conditions,21C(70F).At the end of the 7 day period,air shall beintroduced into the bottom section of the apparatus,increasingthe pressure to 6.9 kPa(1 psig)and immediately released toambient conditions.This cycle is repeated 25 times.5.Significance and Use5
10、.1 This test method provides a means of evaluating roofmembranes,seams,and laps for resistance to water migrationfrom standing water on the roof.This test method evaluatesroof membranes when first applied and also after simulateddeterioration caused by the ultraviolet energy of the sun.6.Apparatus6.
11、1 The test apparatus consists of top section,a supportplate,and a bottom section,which are clamped together withthe sample being evaluated placed as a diaphragm between thetop sections and the support plate.6.1.1 The top section consists of a 203-mm(8-in.)diameter,6-mm(14-in.)wall thickness 203-mm(8
12、-in.)length of clearacrylic pipe,which is cemented to a 305-mm(12-in.)diameterflange.6.1.2 The support plate is a round poly(vinyl chloride)plate,6-mm(14-in.)thick and a 241-mm(912-in.)diameter with6-mm(14-in.)diameter holes spaced 25 mm(1 in.)on center.6.1.3 The bottom section consists of a 305-mm(
13、12-in.)diameter flange attached to a 203-mm(8-in.)diameter,6-mm(14-in.)wall thickness 152-mm(6-in.)length of clear acrylicpipe,which is fabricated with two threaded holes 6 mm(14in.)NPT.These holes are used after the test apparatus sections are1This test method is under the jurisdiction ofASTM Commi
14、ttee D08 on Roofingand Waterproofing and is the direct responsibility of Subcommittee D08.20 onRoofing Membrane Systems.Current edition approved May 1,2013.Published May 2013.Originallyapproved in 2007.Last previous edition approved in 2007 as D7281 07.DOI:10.1520/D7281-07R13.2For referenced ASTM st
15、andards,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
16、-2959.United States1 clamped together,with the roof cover between them.One holeprovides a connection point for air pressure to be increased andreleased;the other hole provides a connection for the pressuregauge.A 305-mm(12-in.)diameter bottom cap is adhered tothe bottom section.6.1.4 The gasket material consists of a non-absorbent,flexible closed cell foam.A silicone sealant is permitted to beused to further aid in preventing water from leaking around theperimeter of the flange of the test appar
