ASTM D3746-85(2002)
(Test Method)Standard Test Method for Impact Resistance of Bituminous Roofing Systems
Standard Test Method for Impact Resistance of Bituminous Roofing Systems
SIGNIFICANCE AND USE
This test method provides a means of evaluating roofing systems for resistance to impact loads of many kinds. It should also be useful in developing performance criteria for roofing systems.
SCOPE
1.1 This test method covers the determination of the resistance of bituminous roofing systems to impact loads at any desired temperature, with a missile of the weight, size, and shape specified herein.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 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 and health practices and determine the applicability of regulatory limitations prior to use. For specific precautionary statements, see Section 6.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D 3746 – 85 (Reapproved 2002)
Standard Test Method for
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Impact Resistance of Bituminous Roofing Systems
This standard is issued under the fixed designation D 3746; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 5. Apparatus
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1.1 This test method covers the determination of the resis- 5.1 VerticalGuideTube, 1.22 m (4.0 ft) long by 60 mm (2 ⁄8
tance of bituminous roofing systems to impact loads at any in.) in inside diameter, suitably positioned over a 610-mm
desired temperature, with a missile of the weight, size, and (24-in.) square, horizontal test table constructed of wood 2 by
shape specified herein. 4s on edge, through-bolted and fitted with a centering jig to
1.2 The values stated in SI units are to be regarded as the ensure proper alignment of the specimen beneath the guide
standard. The values given in parentheses are for information tube (see Fig. 1). The guide tube is adjustable in height to
only. accommodate differing specimen thicknesses and maintain
1.3 This standard does not purport to address all of the constant missile impact energy. Provision is made at the top of
safety concerns, if any, associated with its use. It is the the guide tube to support the missile during alignment of the
responsibility of the user of this standard to establish appro- specimen, and for instantaneous release of the missile to
priate safety and health practices and determine the applica- free-fall within the guide tube until contact is made with the
bility of regulatory limitations prior to use. For specific specimen. Gravel screens are attached to the edges of the test
precautionary statements, see Section 6. table to retain any loose gravel that might fly from the impact
area.
2. Referenced Documents
5.2 Missile (see Fig. 2), consisting of a steel cylinder 50
2.1 ASTM Standards:
mm (2 in.) in diameter by 150 mm (6 in.) long, with a
D 2829 Practice for Sampling and Analysis of Built-Up case-hardened hemispherical head. The mass of the missile is
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Roofs
adjusted to 2.27 kg (5.0 lb) by the addition of lead shot to a
cavity machined into the cylindrical portion and sealed with a
3. Summary of Test Method
screw cap.
3.1 This test method subjects 305 by 305-mm (12 by 12-in.)
6. Safety Precautions
specimens of a roofing system (insulation and membrane
complete with top surfacing) to a series of four impacts, one in 6.1 Employ suitable devices for eye protection when carry-
each quadrant, from a standard missile falling freely from a
ing out steps in 10.1-10.7.3.
predetermined height with an impact energy of 30.0 J (22 6.2 Use a fume hood when extracting specimens with 1,1,1
lbf·ft). Damage to the membrane is assessed by visual exami-
trichloroethane or xylene in 10.7.3.Trichloroethane and xylene
nation of the felts after solvent extraction of the bitumen. are toxic and good ventilation should be provided.
3.2 The effect of specimen temperature on impact resistance
7. Sampling
canbestudiedbyrunningthetestinanenvironmentalchamber
at any desired temperature. 7.1 Field Samples—Cut test specimens directly from an
actual roof, following the instructions in 8.1. Package each
4. Significance and Use
specimen separately in a sealed plastic bag.
4.1 This test method provides a means of evaluating roofing
7.2 Laboratory Samples:
systems for resistance to impact loads of many kinds. It should 7.2.1 Condition all components at 50 6 5 % relative hu-
also be useful in developing performance criteria for roofing
midity and 25 6 1°C (77 6 2°F) for 24 h prior to constructing
systems. the sample membrane.
7.2.2 Prepare sample membranes at least 0.90 by 1.20 m (3
by 4 ft) as required by the roofing system specification being
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This test method is under the jurisdiction ofASTM Committee D08 on Roofing
tested, including insulation and top surfacing. The quantity of
and Waterproofing and is the direct responsibility of Subcommittee D08.20 on
material in each layer of the membrane shall be within 10 % of
Roofing Membrane Systems.
Current edition approved Sept. 27, 1985. Published November 1985. Originally that specified and the entire sample shall be within 5 %.
published as D 3746 – 78. Last previous edition D 3746 – 78.
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Annual Book of ASTM Standards, Vol 04.04.
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D 3746 – 85 (2002)
FIG. 2 Steel Missile
FIG. 1 Guide Tube, Test Table, and Centering Jig
9. Conditioning
8. Test Specimens
9.1 Condition the apparatus and all specimens at the desired
tempe
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