1、Designation: E2925 17Standard Specification forManufactured Polymeric Drainage and Ventilation MaterialsUsed to Provide a Rainscreen Function1This standard is issued under the fixed designation E2925; the number immediately following the designation indicates the year oforiginal adoption or, in the
2、case of revision, the year 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 specification is applicable to manufactured poly-meric materials used to provide a
3、rainscreen function, a meansfor the drainage of liquid moisture and the ventilation of vapormoisture that enters an above-grade exterior wall assembly.Rainscreen materials that comply with this specification areintended to be used behind exterior cladding products andintended to cover one hundred pe
4、rcent (100 %) of the wall areathat is designed to provide a rainscreen function to resist waterinfiltration.1.2 This specification addresses the following types ofrainscreen materials:1.2.1 Type Aentangled mesh materials.1.2.2 Type Bformed/textured sheet material.1.2.3 Type Cformed battens.1.3 The v
5、alues stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.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
6、safety and health practices and determine the applica-bility of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of Internationa
7、l Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2C578 Specification for Rigid, Cellular Polystyrene ThermalInsulationC1338 Test Method for Determining Fungi Resistance ofInsulation Ma
8、terials and FacingsD3045 Practice for Heat Aging of Plastics Without LoadD5199 Test Method for Measuring the Nominal Thicknessof GeosyntheticsD5322 Practice for Laboratory Immersion Procedures forEvaluating the Chemical Resistance of Geosynthetics toLiquidsD6108 Test Method for Compressive Propertie
9、s of PlasticLumber and ShapesD6364 Test Method for Determining Short-Term Compres-sion Behavior of GeosyntheticsE84 Test Method for Surface Burning Characteristics ofBuilding MaterialsE283 Test Method for Determining Rate of Air LeakageThrough Exterior Windows, Curtain Walls, and DoorsUnder Specifie
10、d Pressure Differences Across the Speci-menE631 Terminology of Building ConstructionsE2273 Test Method for Determining the Drainage Efficiencyof Exterior Insulation and Finish Systems (EIFS) CladWall AssembliesG154 Practice for Operating Fluorescent Ultraviolet (UV)Lamp Apparatus for Exposure of Non
11、metallic Materials2.2 Other Standard:3CAN/CGSB 51.33-M89 Vapor Barrier Sheet, ExcludingPolyethylene, for Use in Building Construction3. Terminology3.1 DefinitionsFor definitions of general terms related tobuilding construction used in this specification, refer to Termi-nology E631.3.2 Definitions of
12、 Terms Specific to This Standard:3.2.1 capillary action, vliquid water movement againstgravity induced by the force of molecular attraction (surface1This specification is under the jurisdiction of ASTM Committee E06 onPerformance of Buildings and is the direct responsibility of Subcommittee E06.55on
13、 Performance of Building Enclosures.Current edition approved June 1, 2017. Published August 2017. Originallyapproved in 2014. Last previous edition approved in 2014 as E2925-14. DOI:10.1520/E2925-17.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service
14、 at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from Canadian General Standards Board (CGSB), 11 Laurier St.,Phase III, Place du Portage, Gatineau, Quebec K1A 0S5, Canada, http:/www.tpsgc-pwgsc.gc.ca
15、/ongc-cgsb.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopme
16、nt of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1tension) between the water and the material it contacts,facilitated by a small gap between materials.3.2.2 exterior cladding, nweather-exposed materials of aw
17、all assembly including but not limited to siding, stucco,masonry veneer, but excluding fenestration (doors and win-dows).3.2.3 mortar screen, nlayer of material designed to pre-vent mortar from entering the drainage space.3.2.4 polymeric, nmaterials composed primarily of poly-mers.3.2.5 polymeric ra
18、inscreen material, nmaterial intendedto be installed behind exterior cladding products which createsa drainage and ventilation space for liquid and vapor moisturethat enters an above-grade exterior wall assembly reducingwater transfer to the water resistive barrier (WRB).3.2.6 rainscreen space, nsep
19、aration behind the cladding inthe wall assembly intended to inhibit capillary action andmoisture bridging as well as to promote ventilation and thedrainage of moisture.3.2.7 water-resistive barrier (WRB), nmaterial that isintended to resist liquid water that has penetrated the claddingsystem.4. Clas
20、sification4.1 Type Aentangled mesh materials.4.2 Type Bformed/textured sheet material.4.3 Type Cformed battens.5. Materials and Manufacture5.1 Description of the material composition and structureshall be made available upon request.5.1.1 Descriptions of the materials shall include roll orpackage we
21、ight and dimensions.5.1.2 Descriptions of the material composition shall includelinear density (basis weight).5.1.3 All materials claiming compliance with this specifica-tion shall be described in such statements as described in allapplicable test reports.6. Material Properties6.1 Ventilation/Airflo
22、w Test:6.1.1 The airflow rate shall be measured in accordance withAnnex A1.6.2 Drainage Test:6.2.1 The drainage test shall be conducted in accordancewith Annex A2.6.3 Thickness Test:6.3.1 The thickness shall be measured in accordance withTest Method D5199 at 0.20 kPa.6.4 Compression Test:6.4.1 The c
23、ompressive strength for Type A and B shall bedetermined in accordance with Test Method D6364 at 10 %compression and at full yield (if yield occurs).6.4.2 The compressive strength for Type C shall be deter-mined in accordance with Test Method D6108.6.5 UV Exposure Test:6.5.1 The test specimens shall
24、be exposed in accordancewith Practice G154 following Cycle 1 for 336 h.6.5.2 After the UV exposure test has been completed, thecompression test (6.4) shall be repeated.6.6 Heat Aging:6.6.1 The test specimens shall be heat aged in accordancewith Practice D3045 at a temperature of (77 6 3) C for 90day
25、s.6.6.2 After the heat aging test has been completed, thethickness test (6.3) and the compression test (6.4) shall berepeated.6.7 Mold and Fungi Resistance:6.7.1 The specimens shall be tested in accordance with TestMethod C1338 for 28 days exposure.6.8 Water Exposure:6.8.1 The specimens with dimensi
26、ons (250 6 2) mm by(250 6 2) mm shall be immersed in water in accordance withPractice D5322 using tap water at (50 6 2) C for 168 h.6.8.2 After the water exposure test has been completed andwithin one hour of removal from the water, the compressiontest (6.4) shall be repeated.6.9 Flame Spread Test (
27、Optional):6.9.1 When desired, the material shall be tested in accor-dance with Test Method E84 for flame spread.6.10 Freeze-Thaw (Optional):6.10.1 The freeze-thaw exposure shall be conducted inaccordance with the aging procedure of Section 8.3.2.1 ofCAN/CGSB 51.33-M89.6.10.2 After the freeze thaw ex
28、posure test has been com-pleted and within one hour of the completion of the test, thecompression test (6.4) shall be repeated.7. Material Performance Requirements7.1 All materials shall provide the minimum performancerequirements listed in Table 1.8. Sampling8.1 The material to be tested for confor
29、mance to thisspecification shall be taken directly from a randomly selectedroll or package which is representative of the commercialproduct.9. Specimen Preparation9.1 The specimens from roll materials shall be cut from theinterior of the sample roll so that no specimen edge is nearerthan 75 mm to th
30、e original roll edge.9.2 Unless otherwise stated in the test method, all specimensshall be conditioned for a minimum period of 40 h at (23 62) C and (50 6 10) % relative humidity (RH).9.3 The specimen size shall be determined by the testmethod.9.4 If not otherwise specified in the referenced test me
31、thod,a minimum of five specimens shall be tested and eachspecimen shall meet the minimum performance requirements.E2925 17210. Reporting Requirements10.1 Report required and declared test data in the form of atable(s) with property, result and pass/fail status includingresults for all properties tes
32、ted.10.2 In addition to the information specified in the indi-vidual test methods, all reports describing the testing of thematerial in accordance with the specification shall include thefollowing information:10.2.1 date test conducted;10.2.2 manufacturers name, address, production facilityaddress a
33、nd product designation;10.2.3 type and name of the material and other materialdescription;10.2.4 description of the material composition and struc-ture;10.2.5 lot number and manufactured date;10.2.6 expiration date; if applicable;10.2.7 material sampling procedure used;10.2.8 description of test app
34、aratus, calibration standardsused and their source;10.2.9 name and location of laboratory performing the testsand the accreditation agency for the laboratory;10.2.10 description of the specimen preparation;10.2.11 size of specimens used for each test (length, width(or diameter) and thickness);10.2.1
35、2 declaration of conformity with this specification;10.2.13 if the standard requirements were modified, a state-ment in the test report and a complete description of themodifications;10.2.14 results of drainage test shall be reported as thepercentage and weight of water drained from the test wallass
36、embly (with and without insect screen), and the percentageand weight of the water retained in the test wall assembly;10.2.15 the compression test results shall provide the com-plete compression curve;10.2.16 the compression test values shall be reported at10 % compression and at yield for each sampl
37、e, and theaverage values shall be calculated;10.2.17 the flame spread test results shall include the flamespread rating and smoke developed index;11. Marking and Labeling11.1 The material shall be marked or labeled with manufac-turer name and product name.12. Packaging and Package Marking12.1 The in
38、formation on the material or packaging shallinclude the manufacturers name, product name, and referenceto this specification.12.2 Installation instructions shall be provided as part of thepackaging and shall include as a minimum.12.2.1 maximum weather exposure time allowed beforecladding shall be in
39、stalled;12.2.2 type of mechanical fastener;12.2.3 minimum fastener spacing to attach the material tothe underlying structure; and12.2.4 minimum over lapping requirements.13. Keywords13.1 drainage plane; rainscreen; water-resistive barrier;weather-resistive barrierTABLE 1 Material Performance Require
40、mentsTest Method UnitsPerformance RequirementsMinimumVentilation/Airflow 3.1 L/s DeclareDrainage 3.2 % DeclareThickness 3.3 mm 5CompressionStrength3.4 kPa DeclareUV Exposure 3.5 % 80 % of the compression strengthbefore UV exposureHeat Aging 3.6 % 80 % of the compression strengthbefore heat agingMold
41、/Fungal Growth 3.7 visual no visible mold or fungi growthon the test specimensWater Exposure 3.8 % 80 % of the compression strengthbefore water exposureOptional TestsFlame Spread 3.9 . DeclareFreeze/Thaw 3.10 . 80 % of the compression strengthbefore freeze thawE2925 173ANNEXES(Mandatory Information)
42、A1. DRAINAGE AND VENTILATION/AIRFLOW TESTA1.1 ObjectiveA1.1.1 The objective of this test is to measure the assem-blys ability to allow for ventilation from the bottom of thespecimen up and behind the cladding. Due to the design of thetest apparatus, a separate specimen; other than that which isteste
43、d for drainage, shall be permitted to be tested. The air flowtesting procedure is designed to determine the amount ofairflow under a range of relatively low air pressure differencesin a wall cavity created by the rainscreen material, over theheight of a wall, which are understood to be in the range
44、of 1to 10 Pa under most natural exposure conditions.A1.2 Test ApparatusA1.2.1 Construct a test apparatus using 50 by 100 mm woodframing material. The perimeter framing shall be 1200 mmwide by 2400 mm high, outside dimensions. Two woodframing members, spaced 400 mm on center shall be insertedin the 1
45、200 mm width. All framing members shall be securedat each joint using #10 by 75 mm wood screws. Installa6mm(nominal) clear polycarbonate sheet to the framing members tosimulate both the sheathing and the water resistive barrier.Secure the polycarbonate sheet to the framing members bydrilling holes i
46、n the polycarbonate material and installing #10by 25 mm wood screws every 200 mm (nominal).A1.2.2 Install the rainscreen material being tested over (onthe exterior side of) the polycarbonate sheet in accordance withthe polymeric rainscreen material manufacturers instructions.The instructions shall i
47、nclude the perimeter conditions (that is,flashing/assembly details at the top and bottom of the wallassembly). The sides of the test apparatus with the rainscreenmaterial installed shall be completely sealed to restrict air frombeing able to exit out the sides during the ventilation testing.A1.2.3 I
48、f required by the rainscreen material manufacturer,a mortar screen shall be installed where the rainscreen materialis used behind adhered masonry or cement plaster (stucco)cladding systems.A1.2.4 Where the rainscreen material can be installed withan insect screen at the top and/or bottom, the test a
49、pparatusshall be tested with and without the insect screen(s).A1.2.5 Install a 1200 by 2400 by 50 mm thick (nominal)extruded polystyrene (XPS) foam insulation board complyingwith Specification C578 to the exterior side of the rainscreenmaterial to simulate a cladding system. Install the board inplace using fasteners that go through the XPS and into theframing spaced (400 6 25) mm on center both vertically andhorizontally. Seal the fastener holes in the XPS with sealantthat is compatible with the XPS to prevent water and airleakage. Seal the t
