1、Designation: E2925 14Standard 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.2. Referenced Documents2.1 ASTM Standards:2C578 Specification for Rigid, Cellular Polystyrene ThermalInsulationC1338 Test Method for Determining Fungi Resistance ofInsulation Materials and FacingsD304
7、5 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 Properties of PlasticLumber and
8、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 Specified Pressure Differences
9、Across the Speci-menE631 Terminology of Building ConstructionsE2273 Test Method for Determining the Drainage Efficiencyof Exterior Insulation and Finish Systems (EIFS) CladWall AssembliesE2556/E2556M Specification for Vapor Permeable FlexibleSheet Water-Resistive Barriers Intended for MechanicalAtta
10、chmentG154 Practice for Operating Fluorescent Ultraviolet (UV)Lamp Apparatus for Exposure of Nonmetallic 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 t
11、obuilding construction used in this specification, refer to Termi-nology E631.3.2 Definitions of Terms Specific to This Standard:3.2.1 capillary action, vliquid water movement againstgravity induced by the force of molecular attraction (surfacetension) between the water and the material it contacts,
12、facilitated by a small gap between materials.3.2.2 exterior cladding, nweather-exposed materials of awall assembly including but not limited to siding, stucco,masonry veneer, but excluding fenestration (doors and win-dows).1This specification is under the jurisdiction of ASTM Committee E06 onPerform
13、ance of Buildings and is the direct responsibility of Subcommittee E06.55on Performance of Building Enclosures.Current edition approved June 1, 2014. Published June 2014. DOI: 10.1520/E2925142For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serv
14、iceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from Canadian General Standards Board, Place du Portage III, 6B1,11 Laurier Street, Gatineau, Quebec K1A 1G6 Canada, http:/www.tpsgc-pwgsc.gc.ca/ongc-cgsb.Copy
15、right ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13.2.3 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 rainscreen ma
16、terial, 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, nseparation beh
17、ind 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. Classification4
18、.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 weight and di
19、mensions.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/Airflow Test:6.1.
20、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 compressive
21、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 be exposed
22、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 90days.6.6.2 Afte
23、r 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 dimensions (250 6 2
24、) 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 (Optional):6.9
25、.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 exposure test h
26、as 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 conformance to this
27、specification 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 the original ro
28、ll 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 method,a minimum
29、 of five specimens shall be tested and eachspecimen shall meet the minimum performance requirements.10. 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 tested.10.2 In addition to
30、 the information specified in the indi-vidual test methods, all reports describing the testing of theE2925 142material in accordance with the specification shall include thefollowing information:10.2.1 date test conducted;10.2.2 manufacturers name, address, production facilityaddress and product des
31、ignation;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 apparatus, calibr
32、ation 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);10.2.12 declaration
33、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 wallassembly (with an
34、d 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 sample, and theaver
35、age 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 information on t
36、he 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 installed;12.2.2
37、 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 RequirementsTest Meth
38、od 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/Fungal Growth
39、 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 143ANNEXES(Mandatory Information)A1. DRAINAGE A
40、ND 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 istested for drainage
41、, 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 of 1to 10 Pa u
42、nder most natural exposure conditions.A1.2 Test ApparatusA1.2.1 Construct one 1200 mm by 2400 mm test wallassembly comprised of 50 mm by 100 mm (nominal) perimeterframing and 50 mm by 100 mm (nominal) framing vertically at400 mm on center. Install a wood panel of 11 mm orientedstrand board (OSB) to
43、the framing and fasten with 10dfasteners at 200 mm on center. Install a water resistive barrier(WRB) complying with Specification E2556/E2556M on theOSB in a seamless, continuous manner.NOTE A1.1If the rainscreen material used in the test also qualifies asa WRB, a separate WRB between the rainscreen
44、 material and the OSB isnot required.A1.2.2 Install the rainscreen material being tested over (onthe exterior side of) the WRB in accordance with the polymericrainscreen material manufacturers instructions. The instruc-tions shall include the perimeter conditions (that is, flashing/assembly details
45、at the top and bottom of the wall assembly).The sides of the test apparatus shall be completely sealed torestrict air from being able to exit out the sides during theventilation testing.A1.2.3 If required by the rainscreen material manufacturer,a mortar screen shall be installed where the rainscreen
46、 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 apparatusshall be tested with and without the insect screen(s).A1.2.5 Install a 1200 mm by 2400 mm by 50 mm
47、 thick(nominal) extruded polystyrene (XPS) foam insulation boardcomplying with Specification C578 to the exterior side of therainscreen material to simulate a cladding system. Install theboard in place using fasteners that go through the XPS and intothe framing spaced (400 6 25) mm on center both ve
48、rticallyand horizontally. Seal the fastener holes in the XPS withsealant that is compatible with the XPS to prevent water and airleakage. Seal the top and sides of the specimen to restrict airfrom being able to exit during the testing.A1.2.6 Construct a manifold at the top of the specimen (seeFig.A1
49、.1) from which to introduce the air pressure differential.FIG. A1.1 Schematic of Air Testing ManifoldE2925 144The manifold shall be constructed air tight such that air can bedrawn through the width of the test specimen, while measure-ments are taken to determine the amount of air flow.A1.2.7 Fabricate a four foot length of PVC pipe with aT-joint in the middle, cut in half lengthwise, and sealed againstone end of the wall assembly.A1.2.8 Install a calibrated air flow device complying withTest Method E283 that controls the amount of air being passedthrough th
