1、Designation: D4897/D4897M 16Standard Specification forAsphalt-Coated Glass-Fiber Venting Base Sheet Used inRoofing1This standard is issued under the fixed designation D4897/D4897M; the number immediately following the designation indicates theyear of original adoption or, in the case of revision, th
2、e 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.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope1.1 This specification cov
3、ers asphalt-impregnated andcoated glass-fiber base sheet with mineral surfacing on the topside and coarse mineral granules on the bottom side for use asthe first ply of a roofing membrane. These base sheets providefor the lateral release of pressure in roofing systems becausethey are not solidly att
4、ached and the coarse granular surfaceprovides an open, porous channel in the horizontal planebeneath the membrane. The base sheets shall be permitted to bewith or without perforations or embossings.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.
5、 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.1.3 This standard does not purport to address all of thesafety concerns, if any, associat
6、ed 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:2D146/D146M Test Methods for Sampling and TestingBitumen-Satur
7、ated Felts and Woven Fabrics for Roofingand WaterproofingD228/D228M Test Methods for Sampling, Testing, andAnalysis of Asphalt Roll Roofing, Cap Sheets, andShingles Used in Roofing and WaterproofingD1079 Terminology Relating to Roofing and Waterproofing3. Terminology3.1 DefinitionsFor definitions of
8、 terms used in thisspecification, refer to Terminology D1079.4. Classification4.1 Type IIHeavy-duty asphalt-coated glass-fiber ventingbase sheet.5. Materials and Manufacture5.1 The mat shall be a thin porous sheet of uniformlydistributed glass fibers, with or without the addition of rein-forcing str
9、ands, or glass yarns, which are bonded with awater-resistant resinous binder.5.2 In the process of manufacture, the glass mat is impreg-nated and coated on both sides with a hot asphaltic coating withor without a mineral stabilizer and surfaced on the bottom sidewith coarse mineral granules embedded
10、 in an asphaltic coating.The top side shall be surfaced with fine mineral surfacing.5.3 The product shall be permitted to be embossed orunembossed on the bottom side. The product shall be permittedto contain holes designated for attachment with moppingasphalt.6. Physical Requirements, Dimensions, an
11、d Masses6.1 The material at the point of manufacture shall conformto the physical requirements in Table 1 and the dimensions andmasses in Table 2.6.2 The finished product shall not crack nor be so sticky asto cause tearing or other damage upon being unrolled attemperatures between 10 and 60C 50 and
12、140F.6.3 Pliability at 25 6 1C 77 6 2FAt least eight out often strips shall not crack when tested in accordance with TestMethods D228/D228M except, for convenience, that the stripsshall be conditioned in ambient conditions at 25 6 1C 77 62F for at least 30 min before testing over a 19-mm 34-in.radiu
13、s.6.4 Loss and Behavior on HeatingThere shall be noflowing, sagging, or blistering of the asphalt coating whentested in accordance with Test Methods D228/D228M.1This specification is under the jurisdicton ofASTM Committee D08 on Roofingand Waterproofing and is the direct responsibility of Subcommitt
14、ee D08.04 on Felts,Fabrics and Bituminous Sheet Materials.Current edition approved July 1, 2016. Published July 2016. Originally approvedin 1989. Last previous edition approved in 2009 as D4897/D4897M 01 (2009).DOI: 10.1520/D4897_D4897M-16.2For referenced ASTM standards, visit the ASTM website, www.
15、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 States17. Work
16、manship, Finish, and Appearance7.1 The glass mat shall be impregnated and shall show nowhite spots at any point.7.2 The coating shall be applied to each side to the edges ofthe sheet. The coating must be smooth.7.3 The top side shall be surfaced with mineral surfacing toprevent the roofing from stic
17、king in the package.7.4 The bottom side shall be surfaced with coarse mineralmatter, at least 90 % retained on a 212-m No. 70 sieve,embedded in the asphalt coating.7.5 The finished material shall be free of visible externaldefects, such as holes, ragged or untrue edges, breaks, cracks,tears, protube
18、rances, and indentations, except for intentionallyprovided holes or embossing.7.6 Embossing, when present, should be of such a characterthat it does not cause the product to be susceptible to handlingdamage.8. Sampling and Test Methods8.1 Sample the material and determine the properties enu-merated
19、in this specification in accordance with Test MethodsD146/D146M and D228/D228M.9. Inspection9.1 InspectionInspection shall be in accordance with therequirements of this specification.9.2 Inspection AlternativesAlternative inspection require-ments shall be determined by and as agreed upon between the
20、purchaser and the supplier.10. Rejection and Resubmittal10.1 Failure to ConformFailure to conform to any of therequirements as stated in this specification constitutes groundsfor rejection.10.2 Rejection RedressThe supplier shall have the right toinspect the rejected materials. The supplier and the
21、purchasershall agree to the quantity of rolls deemed unacceptable. Thesupplier shall then have the right to submit the same number ofnew rolls as replacement.11. Packaging and Marking11.1 Unless otherwise agreed upon between the supplier andpurchaser, each product package shall be plainly marked wit
22、hthe suppliers name, the product brand, and the ASTM desig-nation.11.2 The rolls shall be securely wrapped or banded in amanner that completely encircles the roll and will preventslipping or unrolling.11.3 No roll shall contain more than two pieces, and nomore than 3 % of the rolls in any lot shall
23、contain two pieces.If a roll contains a manufacturing splice, the splice shall beclearly marked.12. Keywords12.1 base sheet; first ply; glass fiber; impregnated andcoated; partially attachedTABLE 1 Physical RequirementsType IIBreaking strength, min, at 25 1C 77 2FkN/m lbf/in.longitudinal and transve
24、rse7.7 44Diameter of spot-mopping holes, (when present)max, mm in.25 1.0Spacing of holes, center-to-center (when present)min, mm in.51 2.0max, mm in. 152 6.0D4897/D4897M 162ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentione
25、din this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and
26、must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of
27、theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C
28、700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permiss
29、ion rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 2 Dimensions and MassesAType IIWidth of roll, mm in. 36 914 0.7 %Area of roll, min, m2ft2 9.64 104Mass of any roofing in shipment min, g/m2l
30、b 100 ft2 2685 55Mass of desaturated glass mat min, g/m2lb 100 ft2 83 1.7Mass of asphalt, min, gm/m2lb 100 ft2 586 12Mass of total unstabilized coating, filler and top surfacing min, g/m2lb 100 ft2 1075 22.0Mass of mineral granules retained on a 212-m No. 70 sieve min, g/m2lb 100 ft2 391 8.0Mass of
31、mineral matter passing a 212-m No. 70 sieve on basis of total mass of mineral stabilized coatingand top surface mineral matter, max, %60Ash (glass mat only), % 7088Moisture at point of manufacture, max, % 1.0ATypes cannot be differentiated after installation and must be tested for compliance to the specification before application.D4897/D4897M 163
