1、Designation: D 4897/D 4897M 01 (Reapproved 2009)Standard Specification forAsphalt-Coated Glass-Fiber Venting Base Sheet Used inRoofing1This standard is issued under the fixed designation D 4897/D 4897M; the number immediately following the designation indicates theyear of original adoption or, in th
2、e 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.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This
3、specification covers 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 ar
4、e not solidly attached 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 separa
5、tely 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.1.3 This standard does not purport to address all of thesafety concerns,
6、 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:2D 146 Test Methods for Sampling and Testing
7、Bitumen-Saturated Felts and Woven Fabrics for Roofing and Wa-terproofingD 228 Test Methods for Sampling, Testing, and Analysis ofAsphalt Roll Roofing, Cap Sheets, and Shingles Used inRoofing and WaterproofingD 1079 Terminology Relating to Roofing and Waterproof-ing3. Terminology3.1 DefinitionsFor de
8、finitions of terms used in this speci-fication, refer to Terminology D 1079.4. 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 r
9、ein-forcing strands, 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 gr
10、anules embedded 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,
11、 Dimensions, and Masses6.1 The material at the point of manufacture shall conformto the physical requirements in Table 1 and the dimensions andmasses in Table 2.1This specification is under the jurisdicton ofASTM Committee D08 on Roofingand Waterproofing and is the direct responsibility of Subcommit
12、tee D08.04 on Feltsand Fabrics.Current edition approved June 15, 2009. Published July 2009. Originallyapproved in 1989. Last previous edition approved in 2001 as D 4897 01.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For An
13、nual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6.2 The finished product shall not crack nor be so sticky asto cause teari
14、ng or other damage upon being unrolled attemperatures between 10 and 60C 50 and 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 D 228 except, for convenience, that the strips shall beconditioned in ambient conditions at
15、 25 6 1C 77 6 2F forat least 30 min before testing over a 19-mm 34-in. radius.6.4 Loss and Behavior on HeatingThere shall be noflowing, sagging, or blistering of the asphalt coating whentested in accordance with Test Methods D 228.7. Workmanship, Finish, and Appearance7.1 The glass mat shall be impr
16、egnated 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 sticking in the package.7.4 The bottom side shall be surfaced with
17、 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, protuberances, and indentations, except for intentionallyprovided hol
18、es 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 in this specification in accordance with Test MethodsD 146 and
19、 D 228.9. 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 thepurchaser and the supplier.10. Rejection and Resubmittal10.1 Failure to
20、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 purchasershall agree to the quantity of rolls deemed unacceptable. Thesu
21、pplier 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 withthe suppliers name, the product brand, the ASTM designation,and type of
22、 bitumen if not evident in the label name of theproduct.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 contain tw
23、o 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 6 1C 77 6 2FkN/m lbf/in.longitudinal and transverse7.7
24、 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 6.0D 4897/D 4897M 01 (2009)2ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item menti
25、onedin 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 a
26、nd 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
27、of 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 Bo
28、x C700, 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).TABLE
29、 2 Dimensions and MassesAType IIWidth of roll, mm in. 36 914 6 0.7 %Area of roll, min, m2ft2 9.64 104Mass of any roofing in shipment min, g/m2lb/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, fill
30、er 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 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.D 4897/D 4897M 01 (2009)3
