ASTM D3746-85(1996)e1
(Test Method)Standard Test Method for Impact Resistance of Bituminous Roofing Systems
Standard Test Method for Impact Resistance of Bituminous 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 This standard does not purport to address all of the safety problems, 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.
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e1
Designation: D 3746 – 85 (Reapproved 1996)
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Test Method for
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.
e NOTE—Editorial changes were made throughout in July 1996.
1. Scope 5. Apparatus
1.1 This test method covers the determination of the resis- 5.1 Vertical Guide Tube, 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 assure proper alignment of the specimen beneath the guide tube
standard. The values given in parentheses are for information (see Fig. 1). The guide tube is adjustable in height to accom-
only. modate differing specimen thicknesses and maintain constant
1.3 This standard does not purport to address all of the missile impact energy. Provision is made at the top of the guide
safety concerns, if any, associated with its use. It is the tube to support the missile during alignment of the specimen,
responsibility of the user of this standard to establish appro- and for instantaneous release of the missile to free-fall within
priate safety and health practices and determine the applica- the guide tube until contact is made with the specimen. Gravel
bility of regulatory limitations prior to use. For specific screens are attached to the edges of the test table to retain any
precautionary statements, see Section 6. loose gravel that might fly from the impact area.
5.2 Missile (see Fig. 2), consisting of a steel cylinder 50
2. Referenced Documents
mm (2 in.) in diameter by 150 mm (6 in.) long, with a
2.1 ASTM Standards: case-hardened hemispherical head. The mass of the missile is
D 2829 Practice for Sampling and Analysis of Built-Up adjusted to 2.27 kg (5.0 lb) by the addition of lead shot to a
Roofs cavity machined into the cylindrical portion and sealed with a
screw cap.
3. Summary of Test Method
6. Safety Precautions
3.1 This test method subjects 305 by 305-mm (12 by 12-in.)
6.1 Employ suitable devices for eye protection when carry-
specimens of a roofing system (insulation and membrane
ing out steps in 10.1-10.7.3 .
complete with top surfacing) to a series of four impacts, one in
6.2 Use a fume hood when extracting specimens with 1,1,1
each quadrant, from a standard missile falling freely from a
trichloroethane or xylene in 10.7.3. Trichloroethane and xylene
predetermined height with an impact energy of 30.0 J (22
are toxic and good ventilation should be provided.
lbf·ft). Damage to the membrane is assessed by visual exami-
nation of the felts after solvent extraction of the bitumen.
7. Sampling
3.2 The effect of specimen temperature on impact resistance
7.1 Field Samples—Cut test specimens directly from an
can be studied by running the test in an environmental chamber
actual roof, following the instructions in 8.1. Package each
at any desired temperature.
specimen separately in a sealed plastic bag.
4. Significance and Use
7.2 Laboratory Samples:
7.2.1 Condition all components at 50 6 5 % relative hu-
4.1 This test method provides a means of evaluating roofing
midity and 256 1°C (77 6 2°F) for 24 h prior to constructing
systems for resistance to impact loads of many kinds. It should
the sample membrane.
also be useful in developing performance criteria for roofing
7.2.2 Prepare sample membranes at least 0.90 by 1.20 m (3
systems.
by 4 ft) as required by the roofing system specification being
tested, including insulation and top surfacing. The quantity of
This test method is under the jurisdiction of ASTM Committee D-8 on Roofing, material in each layer of the membrane shall be within 10 % of
Waterproofing, and Bituminous Materialsand is the direct responsibility of Subcom-
that specified and the entire sample shall be within 5 %.
mittee D08.20 on Roof Membrane Systems.
Current edition approved Sept. 27, 1985. Published November 1985. Originally
8. Test Specimens
published as D 3746 – 78. Last previous edition D 3746 – 78.
Annual Book of ASTM Standards, Vol 04.04. 8.1 Test specimens may be taken directly from an actual
NOTICE:¬This¬standard¬has¬either
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