ASTM D7052/D7052M-17(2022)
(Test Method)Standard Test Method for Determining Impact Resistance of New Low Slope Roof Membranes Using Steel Balls (Z8295Z)
Standard Test Method for Determining Impact Resistance of New Low Slope Roof Membranes Using Steel Balls (Z8295Z)
SIGNIFICANCE AND USE
6.1 This test method provides a means of evaluating new roof membranes for resistance to specific impact energies. The method evaluates new roof membranes when first applied and also after simulated deterioration caused by the ultraviolet radiation and moisture.
6.2 Use Class 2 for an impact resistance of 11.0 ± 0.3 J [8.1 ± 0.2 ft-lb] and Class 3 for an impact resistance of 19.4 ± 0.4 J [14.3 ± 0.3 ft-lb].
SCOPE
1.1 This test method covers the determination of impact resistance of new low slope roof membranes when applied directly over rigid insulation or cover board, or structural concrete, lightweight insulating concrete, gypsum, cementitious wood fiber, or wood roof decks. The procedures were developed to determine the potential for puncture or fracture of the new roof membrane resulting from impacts by free-falling steel balls resulting in specific impact energies when the new roof membrane is applied over its tested substrate within an assembly.
1.2 This test method is intended to verify that products as described will meet a specific stated condition of impact resistance performance. Testing of asphalt shingles is beyond the scope of this test method. The tests yield classification identified as Class 2 and Class 3.
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
Relations
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D7052/D7052M − 17 (Reapproved 2022)
Standard Test Method for
Determining Impact Resistance of New Low Slope Roof
Membranes Using Steel Balls (Z8295Z)
This standard is issued under the fixed designation D7052/D7052M; the number immediately following the designation indicates the
year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last
reapproval. A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2. Referenced Documents
2.1 ASTM Standards:
1.1 This test method covers the determination of impact
A295/A295MSpecification for High-Carbon Anti-Friction
resistance of new low slope roof membranes when applied
Bearing Steel
directly over rigid insulation or cover board, or structural
D1079Terminology Relating to Roofing and Waterproofing
concrete, lightweight insulating concrete, gypsum, cementi-
G154Practice for Operating Fluorescent Ultraviolet (UV)
tious wood fiber, or wood roof decks. The procedures were
Lamp Apparatus for Exposure of Nonmetallic Materials
developedtodeterminethepotentialforpunctureorfractureof
the new roof membrane resulting from impacts by free-falling
3. Terminology
steel balls resulting in specific impact energies when the new
roof membrane is applied over its tested substrate within an
3.1 For definitions of terms used in this standard, see
assembly.
Terminology D1079.
1.2 This test method is intended to verify that products as 3.2 Definitions:
described will meet a specific stated condition of impact 3.2.1 adhered roof membrane—asingleplyorbaseply(part
of a multi-ply system) membrane that is adhered using an
resistance performance. Testing of asphalt shingles is beyond
the scope of this test method. The tests yield classification adhesive.
identified as Class 2 and Class 3.
3.2.2 field seam—a splice made in the field of a roof
membrane which joins two sheets together using an adhesive,
1.3 The values stated in either SI units or inch-pound units
splicing tape, heat, or solvent-welding.
are to be regarded separately as standard. The values stated in
each system may not be exact equivalents; therefore, each 3.2.3 mechanically fastened membranes—a single ply or
base ply (part of a multi-layer system) membrane which has
system shall be used independently of the other. Combining
values from the two systems may result in nonconformance been positively attached at intervals to the substrate, usually
with fasteners and plates, or other mechanical devices such as
with the standard.
battens, or both.
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
4. Classification
responsibility of the user of this standard to establish appro-
4.1 Class 2—Adesignationachievedwhenaroofmembrane
priate safety, health, and environmental practices and deter-
subjected to an impact energy of approximately 11.0 6 0.3 J
mine the applicability of regulatory limitations prior to use.
[8.1 6 0.2 ft-lb] in accordance to this test method meets the
1.5 This international standard was developed in accor-
results stated in Section 11.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
4.2 Class 3—Adesignationachievedwhenaroofmembrane
Development of International Standards, Guides and Recom-
subjected to an impact energy of approximately 19.4 6 0.4 J
mendations issued by the World Trade Organization Technical
[14.3 6 0.3 ft-lb] in accordance to this test method meets the
Barriers to Trade (TBT) Committee.
results stated in Section 11.
NOTE 1—Class 1 is beyond the scope of this test method.
ThistestmethodisunderthejurisdictionofASTMCommitteeD08onRoofing
and Waterproofing and is the direct responsibility of Subcommittee D08.20 on
Roofing Membrane Systems. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Dec. 15, 2022. Published December 2022. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 2017. Last previous edition approved in 2017 as D7052/D7052M–17. Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/D7052_D7052M-17R22. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D7052/D7052M − 17 (2022)
5. Summary of Test Method both sides of the tube. The pin acts as a stop for the steel ball.
Adjustment is provided to maintain the drop height of the ball
5.1 Thistestmethodsubjectsroofmembranestoimpactsby
to accommodate different sample thicknesses (see Figs. 1 and
dropping a solid steel ball ten times from the appropriate
2).
apparatus (Figs. 1 and 2) onto test samples of the roof
membrane being examined.
7.2 Striker—Asteelball51 62.5mm[2 60.1in.]diameter
weighing 540 6 27 g [1.19 6 0.06 lb] meeting Specification
5.2 Roof membrane samples are conditioned in a fluores-
A295/A295M–46T.
cent ultraviolet condensation type artificial weathering appara-
tus.
7.3 Supporting Base—Unless otherwise specified, the
5.2.1 Impact testing is performed on samples which are
membrane-substrate assembly shall be placed directly on a flat
conditioned and not conditioned.
solidconcretesupportsuchasaconcretefloor(withorwithout
tile) during impact test. The back surface of the substrate shall
6. Significance and Use
beincontactwiththesupport.Ifaspecimensupportotherthan
6.1 This test method provides a means of evaluating new
flat concrete is used, it shall be indicated on the test report.
roof membranes for resistance to specific impact energies.The
7.4 Class 2 (Fig. 1)—A steel ball meeting Specification
method evaluates new roof membranes when first applied and
A295/A295M–46T, TypeAis dropped from a height of 2.1 6
also after simulated deterioration caused by the ultraviolet
0.05 m [81 6 2 in.] onto the sample by removing the pin from
radiation and moisture.
the tube. This procedure generates an impact energy of
6.2 UseClass2foranimpactresistanceof11.0 60.3J[8.1
approximately 11.0 6 0.3 J [8.1 6 0.2 ft-lb] over the impact
60.2ft-lb]andClass3foranimpactresistanceof19.4 60.4J
area.
[14.3 6 0.3 ft-lb].
7.5 Class 3 (Fig. 2)—A steel ball meeting Specification
7. Apparatus
A295/A295M–46T, TypeAis dropped from a height of 3.6 6
7.1 Guide Tube—The test apparatus consists of a section of 0.1 m [141.2 6 4.3 in.] onto the sample by removing the pin
aPVCpipe57 62.8mm[2.25 60.1in.]I.D.supportedabove from the tube. This procedure generates an impact energy of
andperpendiculartothesample.Thistubehastwoholesbelow approximately19.40 60.4J[14.3 60.3ft-lb]overtheimpact
the top of the tube, which allow a pin to be inserted through area.
FIG. 1 Class 2 Test Setup
D7052/D7052M − 17 (2022)
FIG. 2 Class 3 Test Setup
8. Sampling, Test Specimens, and Test Units [19mm] thick plywood and secured to the plywood with the
fastener and plate agreed to by the sponsor and test laboratory.
8.1 Enough material for two representative roof membrane
samples, minimum 0.3 by 0.6 m [1 by 2 ft], is selected for the
8.5 For roof covers that are mechanically attached, the
material to be tested. 3
substrate is applied over ⁄4 in. [19 mm] thick plywood and the
8.1.1 For materials supplied as sheets or rolls, the sample
roof cover is applied over the substrate and mechanically
shall incorporate a field seam constructed in accordance with
attached to the plywood with the fastener and plate agreed to
the manufacturer’s instructions within the assembly, in the
by the sponsor and test laboratory.
center and parallel to the long s
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