1、Designation: D 1970 08Standard Specification forSelf-Adhering Polymer Modified Bituminous Sheet MaterialsUsed as Steep Roofing Underlayment for Ice DamProtection1This standard is issued under the fixed designation D 1970; the number immediately following the designation indicates the year oforiginal
2、 adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers polymer modified bituminoussheet materia
3、ls intended for use as underlayment on roof eaves,or valleys, or both, to prevent leakage of shingle, tile, or metalroofs from water back-up due to ice dams.1.2 These underlayment sheets have a sticky adhesive layerwhich is exposed by removal of a protective sheet. The topsurface is suitable to work
4、 on during the application of theexposed roofing.1.3 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.4 The following safety hazards caveat pertains to the testmethods portion, Section 7, of this standard. This standarddoes no
5、t purport to address all of the safety concerns, if any,associated with its use. It is the responsibility of the user of thisstandard to establish appropriate safety and health practicesand determine the applicability of regulatory limitations priorto use.2. Referenced Documents2.1 ASTM Standards:2D
6、 228 Test Methods for Sampling, Testing, and Analysis ofAsphalt Roll Roofing, Cap Sheets, and Shingles Used inRoofing and WaterproofingD 903 Test Method for Peel or Stripping Strength of Adhe-sive BondsD 1079 Terminology Relating to Roofing and Waterproof-ingD 1204 Test Method for Linear Dimensional
7、 Changes ofNonrigid Thermoplastic Sheeting or Film at ElevatedTemperatureD 2523 Practice for Testing Load-Strain Properties of Roof-ing MembranesD 4073 Test Method for Tensile-Tear Strength of Bitumi-nous Roofing MembranesD 5147 Test Methods for Sampling and Testing ModifiedBituminous Sheet Material
8、E 96/E 96M Test Methods for Water Vapor Transmission ofMaterials3. Terminology3.1 DefinitionsFor definitions of terms used in this speci-fication, refer to Terminology D 1079.3.2 Definitions of Terms Specific to This Standard:3.2.1 lotfor the purpose of sampling, a lot shall consist ofall material m
9、anufactured in one production run (not to exceed24 h) using the same source of raw materials.4. Workmanship, Finish, and Appearance4.1 The underlayment sheet shall be supplied in roll form.4.2 The underlayment sheet shall be substantially uniformin thickness and appearance. It shall be free of visib
10、le defectssuch as holes, ragged or untrue edges, breaks, cracks, tears,protuberances, and indentations, except for those perforationsor protuberances which are intentional.4.3 The surface of the underlayment sheet shall be designedto provide traction and slip resistance to the applicator.NOTE 1The i
11、ntent of 4.3 is to recognize that surface slipperiness isimportant when working on a roof and, while no test method is specifiedin this standard, several methods for assessing the relative slipperiness ofsurfaces are available. It is the further intent of this paragraph to ensurethat, whatever metho
12、d is used, the friction coefficient or resistance toslipping of the surface of these products should be at least as great asasphalt-saturated felt shingle underlayment tested under the same condi-tions of temperature and wetness as agreed between purchaser and seller.4.4 Sheet sections shall be suit
13、able for joining by themanufacturers recommended procedure. The entire lowersurface of the underlayment sheet shall be capable of beingfully adhered to the roof deck.1This specification is under the jurisdiction of ASTM Committee D08 onRoofing and Waterproofing and is the direct responsibility of Su
14、bcommittee D08.02on Prepared Roofings, Shingles and Siding Materials.Current edition approved May 1, 2008. Published May 2008. Originallyapproved in 1990. Last previous edition approved in 2001 as D 1970 01.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer
15、 Service at serviceastm.org. For Annual 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.5. Physical Requirements5.1 The underla
16、yment sheet shall conform to the physicalrequirements prescribed in Table 1.5.2 The underlayment sheet shall not crack nor be so stickyas to cause tearing or other damage upon being unrolled atmaterial temperatures between 4.4 and 60C (40 and 140F).6. Sampling6.1 From each lot of underlayment sheet,
17、 select sample rollsin accordance with Test Methods D 228.6.2 The rolls so selected shall constitute the representativesample used for all subsequent observations and tests pertain-ing to the lot of material being examined.7. Test Methods7.1 ConditioningUnless otherwise specified, conditiontest spec
18、imens for at least4hat236 2C (73.4 6 3.6F) and50 6 5 % relative humidity prior to testing.7.2 Thickness:7.2.1 Measure the thickness of the shingle underlayment inaccordance with Test Methods D 5147.7.2.2 Report the number of measurements, the average andstandard deviation across the sheet.7.3 Maximu
19、m Load and Elongation at BreakThis testmethod covers the determination of the maximum load andelongation at break of the underlayment sheets, as set forth inPractice D 2523 except as noted below.7.3.1 Specimens:7.3.1.1 Prepare five specimens from each sample roll inboth the longitudinal and transver
20、se directions. Specimensshall be 25 mm (1 in.) 65 % wide by a minimum of 150 mm(6 in.) 65 % long. For materials with high elongation thelength of the sample may be reduced to 100 mm (4 in.) 65%if necessary to avoid limitations imposed by dimensions of thetest machine.7.3.2 Procedure:7.3.2.1 Conditio
21、n each specimen at least2hat236 2C(73.4 6 3.6F).7.3.2.2 Use a constant rate of elongation (CRE) tensiontesting machine, preferably with automatic load and strainrecording equipment and clamps that permit a uniform clamp-ing pressure on the specimen without slipping. The initialclamp separation shall
22、 be a minimum of 75 mm (3 in.) 65%for sheets having an ultimate elongation of 75 % or less at23.9C (75F) and 50 mm (2 in.) 65 % for sheets having anultimate elongation greater than 75 % at 23.9C (75F).7.3.2.3 Maintain a rate of separation of 50 mm (2 in.) 63%per min.7.3.2.4 Record the percent elonga
23、tion of each specimen atthe visual break of the modified bitumen portion using anextensiometer, or mark the extension at visual break of themodified bitumen portion from the chart of the stress versustime (knowing the speed of the chart drive and the jawseparation rate).7.3.2.5 Record the maximum lo
24、ad attained by each speci-men.7.3.3 Calculation:7.3.3.1 Determine the percent elongation at break of themodified bitumen portion obtained from the extensiometer inaccordance with the manufacturers instructions, or read di-rectly. Calculate the percent elongation from the chart asfollows:% Elongation
25、 5ab3 100 % (1)where:a = extension at modified bitumen break (extension atbreak on chart 3 jaw separation rate divided by chartspeed), andb = initial jaw separation.7.3.3.2 Determine the average percent elongation at breakof the modified bitumen portion in each direction.7.3.3.3 Calculate the averag
26、e maximum load in each direc-tion.7.3.4 ReportFor each set of five specimens in eachdirection report the individual measurements, the average andstandard deviation for the size of specimen (initial lengthbetween jaws), maximum load in kN/m (lbf/in.), percentelongation at modified bitumen break, and
27、method of deter-mining elongation.7.4 Adhesion to PlywoodThis test method covers thedetermination of the adhesive properties of the underlaymentsheets to plywood, as set forth in Test Method D 903 except asnoted below.7.4.1 Specimen Preparation:7.4.1.1 The test specimen shall consist of one piece of
28、underlayment sheet, 75 6 2 by 200 6 2mm(36 0.125 by 86 0.125 in.), bonded for 15 in.2(75 3 125 mm) (3 by 5 in.) toone piece of 6 mm (14 in.) minimum thick plywood, APAGrade, Exposure 1, 75 by 150 mm (3 by 6 in.). The plywoodmust not be reused for testing.TABLE 1 Physical Requirements of Self-Adherin
29、g PolymerModified Bituminous Sheet Materials Used as Steep RoofingUnderlayment for Ice Dam ProtectionProperty SI Inch-PoundThickness, min 1.0 mm 40 milsMaximum load, minLongitudinal 4.4 kN/m 25 lbf/in.Transverse 4.4 kN/m 25 lbf/in.Elongation at break, min of modifiedbitumen portion10 %Adhesion to pl
30、ywood, min at 40F 0.92 kgf/30.5 cm 2.0 lbf/ft widthAdhesion to plywood, min at 75F 5.44 kgf/30.5 cm 12.0 lbf/ft widthThermal stability, max 3 mm 0.1 in.Flexibility temperature 29C 20FTear resistanceLongitudinal, min 89 N 20 lbfTransverse, min 89 N 20 lbfMoisture vapor permeance, max 5.7 ng/Pa.S.M.20
31、.1 U.S. PermsSealability around nail passWaterproof integrity after low temperatureflexibilitypassWaterproof integrity of lap seam passSlip resistance Greater thanasphalt saturatedfelt when testedunder the sameconditions oftemperature andwetness (seeNote 1)D19700827.4.1.2 Roll test specimen three ti
32、mes back and forth with aroller which has a mass of 11.8 kg (26 lb) 60.5 %, diameter of125 mm (5 in.) 65 %, and width of 125 mm (5 in.) 65%(2to 3 s per cycle).7.4.1.3 At least five specimens shall be tested for each testtemperature.7.4.1.4 It is recommended that specimens be assembledindividually. C
33、utting specimens to size after assembly mayinfluence the test results.7.4.2 ConditioningThe test shall be performed at 23 62C (73.4 6 3.6F) and 4 6 2C (39.2 6 3.6F). Materialsused to construct test specimens and the roller, must beconditioned at the test temperature for at least 4 h prior toassembly
34、. Similarly, test specimens must be conditioned at thetest temperatures for at least 1 h prior to testing.NOTE 2Adhesion to other potential wood deck materials may bedetermined by this test method, but it has been observed that substratessuch as APA approved nonveneer sheets typically give greater a
35、dhesionvalues than the minimum specified in this standard for plywood.7.4.3 Apparatus:7.4.3.1 Perform the test in a constant rate of extension typetester.7.4.3.2 The rate of travel of the power-actuated grip shall be50 mm (2 in.)/min 63 %. This rate which provides a laminateseparation rate of 25 mm
36、(1 in.)/min 63 % shall be uniformthroughout the test.7.4.4 Procedure:7.4.4.1 Conduct the test after the test specimens have beenconditioned at the test temperature (in the environmentalchamber) for 15 min.7.4.4.2 Separate the free end of the underlayment sheetfrom the plywood for a distance of about
37、 50 mm (2 in.) leavingabout 75 mm (3 in.) of bonded length. Place the specimen inthe testing machine by clamping the free end of the plywood inone grip, turning back the free end of the sheet and clampingit in the other grip. Maintain the specimen in the approximateplane of the clamps during the tes
38、t. Peel at least three quartersof the bonded area, even though a peel or stripping value maybe indicated before this point.7.4.5 CalculationDetermine the peel strength on the chartas the average load line that will visually accommodate therecorded curve. Record the load so indicated, corrected forta
39、re.7.4.6 ReportingFor each series of tests, report the numberof measurements, the average, and the standard deviation of allthe test values in kg/30.5 cm width (lb/ft of width).7.5 Thermal StabilityThis test method determines thethermal stability of the underlayment sheets as set forth in TestMethod
40、 D 1204, except as noted below.7.5.1 Specimens:7.5.1.1 The test specimen shall consist of one piece ofunderlayment sheet, 100 6 2by1006 2mm(46 0.125 by4 6 0.125 in.), centered and bonded (as described in 7.4.2.1) toone piece of14-in. thick plywood, (APA Grade, Exposure 1)150 6 2by2006 2mm(66 0.125 b
41、y 8 6 0.125 in.).7.5.1.2 At least five specimens shall be tested for eachsample roll.7.5.2 Procedure:7.5.2.1 Set specimens at a 45 angle in a hot air circulatingoven maintained at 70 6 2C (158 6 4F) for 14 days.7.5.2.2 At the end of the oven-exposure period, allowspecimens to equilibrate to 23.9 6 1
42、.1C (75 6 2F) and 50 65 % relative humidity for at least 4 h.7.5.2.3 From the lower edge of the sheet measure to thenearest 2.5 mm (0.1 in.) the furthest point of modified bitumenflow. Estimate the average flow across the entire lower edge ofthe sample.7.5.3 ReportReport the individual specimen valu
43、es, theaverage and the standard deviation.7.6 Low Temperature FlexibilityThis test method deter-mines the low temperature flexibility of the underlaymentsheets. For the sheet material to be given a pass rating in thistest, the specimen must demonstrate either no visible signs ofcracking in the sheet
44、 after bending at the test temperaturethrough an angle of 180 6 5 around a 25 mm (1 in.) 65%diameter mandrel in 2 6 1 s, or minor surface cracking isobserved in the sheet and the head of water test, performed ona sheet of material that has been subjected to this bending.7.6.1 SpecimensPrepare five s
45、pecimens from each roll inboth the longitudinal and transverse direction for each tem-perature to be tested. Specimens shall be 25 mm (1 in.) 65%wide by 150 mm (6 in.) 65 % long.7.6.2 ConditioningTest at the temperature specified forcompliance in Table 1 (29C (20F). Allow the refrigera-tion unit, ma
46、ndrel and specimens to equilibrate for a minimumof2h.7.6.3 Procedure:7.6.3.1 After the specimens have been conditioned, positionthe center of the specimen firmly on the mandrel with theweathering side up. Bend the projecting ends without exertingany stress other than that required to keep the specim
47、en incontact with the mandrel. Complete the entire procedure insidethe refrigerated unit within 2 6 1 s. Bend the specimen untilthe projecting ends of the specimen are parallel to each otherkeeping the bottom surface in contact with the mandrel throughan arc of 180 6 5. Repeat this procedure using a
48、 differentspecimen and bend with the weathering side down.7.6.3.2 Remove the specimen from the refrigerated unit andimmediately inspect for any signs of cracking.7.6.3.3 Repeat the procedure for any remaining specimens.The temperature of the refrigeration unit may increase duringtesting. Allow refri
49、geration unit to equilibrate to test tempera-ture prior to testing subsequent samples.7.6.3.4 All specimens must pass at the test temperature of29C (20F).7.6.3.5 To ensure that the material will perform its intendedfunction, the head of water test (7.9) shall be performed on atleast one specimen that has been flexed and judged to pass theflexibility test at the test temperature and that specimen shallalso pass the head of water test.7.6.4 ReportReport whether the material passes or fails atthe specified temperature.7.7 Tear Resi
