ASTM D3746-85(2008)

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

• Status: Historical
• Publication Date: 30-Apr-2008
• ICS: 91.100.50 - Binders. Sealing materials
• Technical Committee: D08 - Roofing and Waterproofing
• Drafting Committee: D08.20 - Roofing Membrane Systems

Relations

• Replaces: ASTM D3746-85(2002) - Standard Test Method for Impact Resistance of Bituminous Roofing Systems
• Effective Date: 01-May-2008

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D3746 −85(Reapproved 2008)
Standard Test Method for
Impact Resistance of Bituminous Roofing Systems
This standard is issued under the fixed designation D3746; 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 4. Significance and Use
4.1 This test method provides a means of evaluating roofing
1.1 This test method covers the determination of the resis-
systems for resistance to impact loads of many kinds. It should
tance of bituminous roofing systems to impact loads at any
also be useful in developing performance criteria for roofing
desired temperature, with a missile of the weight, size, and
systems.
shape specified herein.
1.2 The values stated in SI units are to be regarded as the
5. Apparatus
standard. The values given in parentheses are for information
5.1 VerticalGuideTube, 1.22 m (4.0 ft) long by 60 mm (2 ⁄8
only.
in.) in inside diameter, suitably positioned over a 610-mm
1.3 This standard does not purport to address all of the (24-in.) square, horizontal test table constructed of wood 2 by
safety concerns, if any, associated with its use. It is the 4s on edge, through-bolted and fitted with a centering jig to
responsibility of the user of this standard to establish appro- ensure proper alignment of the specimen beneath the guide
priate safety and health practices and determine the applica- tube (see Fig. 1). The guide tube is adjustable in height to
bility of regulatory limitations prior to use. For specific accommodate differing specimen thicknesses and maintain
constant missile impact energy. Provision is made at the top of
precautionary statements, see Section 6.
the guide tube to support the missile during alignment of the
specimen, and for instantaneous release of the missile to
2. Referenced Documents
free-fall within the guide tube until contact is made with the
2.1 ASTM Standards:
specimen. Gravel screens are attached to the edges of the test
D2829 Practice for Sampling and Analysis of Existing
table to retain any loose gravel that might fly from the impact
Built-Up Roof Systems
area.
5.2 Missile (see Fig. 2), consisting of a steel cylinder 50 mm
3. Summary of Test Method
(2 in.) in diameter by 150 mm (6 in.) long, with a case-
3.1 This test method subjects 305 by 305-mm (12 by 12-in.)
hardened hemispherical head. The mass of the missile is
specimens of a roofing system (insulation and membrane
adjusted to 2.27 kg (5.0 lb) by the addition of lead shot to a
complete with top surfacing) to a series of four impacts, one in
cavity machined into the cylindrical portion and sealed with a
each quadrant, from a standard missile falling freely from a
screw cap.
predetermined height with an impact energy of 30.0 J (22
6. Safety Precautions
lbf·ft). Damage to the membrane is assessed by visual exami-
nation of the felts after solvent extraction of the bitumen.
6.1 Employ suitable devices for eye protection when carry-
ing out steps in 10.1 – 10.7.3.
3.2 The effect of specimen temperature on impact resistance
canbestudiedbyrunningthetestinanenvironmentalchamber
6.2 Use a fume hood when extracting specimens with 1,1,1
at any desired temperature.
trichloroethane or xylene in 10.7.3.Trichloroethane and xylene
are toxic and good ventilation should be provided.
7. Sampling
This test method is under the jurisdiction ofASTM Committee D08 on Roofing
7.1 Field Samples— Cut test specimens directly from an
and Waterproofing and is the direct responsibility of Subcommittee D08.20 on
Roofing Membrane Systems.
actual roof, following the instructions in 8.1. Package each
Current edition approved May 1, 2008. Published June 2008. Originally
specimen separately in a sealed plastic bag.
approved in 1978. Last previous edition approved in 2002 as D3746 – 85 (2002).
DOI: 10.1520/D3746-85R08.
7.2 Laboratory Samples:
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
7.2.1 Condition all components at 50 6 5 % relative hu-
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
midity and 25 6 1°C (77 6 2°F) for 24 h prior to constructing
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. the sample membrane.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D3746−85 (2008)
FIG. 2 Steel Missile
FIG. 1 Guide Tube, Test Table, and Centering Jig
insulation. The buffer zone should be a “V” type wedge extending to the
bottomofthespecimenthicknesstoberemovedfortesting.Theinsidetop
7.2.2 Prepare sample membranes at least 0.90 by 1.20 m (3
of the “V” wedge area should be the edge of the metal template. It is
by 4 ft) as required by the roofing system specification being
normally 75 to 100 mm
...