ASTM D7425-08

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D7425 – 08
Standard Specification for
Spray Polyurethane Foam Used for Roofing Applications
This standard is issued under the fixed designation D7425; 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 D1623 Test Method for Tensile and TensileAdhesion Prop-
erties of Rigid Cellular Plastics
1.1 This specification covers the types and physical proper-
D2126 Test Method for Response of Rigid Cellular Plastics
ties of spray polyurethane foam (SPF) for use in SPF roofing
to Thermal and Humid Aging
applications.
D2842 Test Method for WaterAbsorption of Rigid Cellular
1.2 This specification does not provide guidance for appli-
Plastics
cation.
D6226 TestMethodforOpenCellContentofRigidCellular
1.3 The values stated in SI units are to be regarded as
Plastics
standard. The values given in parentheses are for information
E96/E96M Test Methods for Water Vapor Transmission of
only.
Materials
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
3. Terminology
responsibility of the user of this standard to establish appro-
3.1 Definitions—For definitions of terms used in this speci-
priate safety and health practices and determine the applica-
fication, refer to Terminologies D1079 and C168.
bility of regulatory limitations prior to use.
3.1.1 knit line—also called lift line. They are interchange-
2. Referenced Documents able terms describing the adhesion plane where one pass is
sprayed over another.
2.1 ASTM Standards:
C165 Test Method for Measuring Compressive Properties
4. Significance and Use
of Thermal Insulations
4.1 This specification covers spray polyurethane foam
C168 Terminology Relating to Thermal Insulation
(SPF) that is used as part of a SPF roofing system.
C177 Test Method for Steady-State Heat Flux Measure-
ments and Thermal Transmission Properties by Means of
5. Classification
the Guarded-Hot-Plate Apparatus
5.1 This specification covers SPF currently commercially
C518 Test Method for Steady-State Thermal Transmission
available as described by the physical property requirements in
Properties by Means of the Heat Flow Meter Apparatus
Table 1.
C1363 Test Method for Thermal Performance of Building
5.2 SPF shall be manufactured with HFC, hydrocarbon
Materials and Envelope Assemblies by Means of a Hot
or/and water blowing agents. It is classified into two types as
Box Apparatus
follows:
D1079 Terminology Relating to Roofing andWaterproofing
5.2.1 Type I—Thermal resistance, R value, is equal to or
D1621 Test Method for Compressive Properties Of Rigid
2 2
greater than 0.98 K·m /W(5.6°F·ft ·h/Btu) per 25.4 mm (1 in.)
Cellular Plastics
thickness.
D1622 Test Method forApparent Density of Rigid Cellular
5.2.2 Type II—Thermal resistance, R value, is between 0.72
Plastics
2 2
and 0.98 K·m /W (4.1 and 5.6°F·ft ·h/Btu) per 25.4 mm (1 in.)
thickness.
This specification is under the jurisdiction of ASTM Committee D08 on 6. Ordering Information
Roofing and Waterproofing and is the direct responsibility of Subcommittee D08.06
6.1 Orders for materials purchased under this specification
on Spray Polyurethane Foam Roof Systems.
shall include the following:
Current edition approved April 1, 2008. Published May 2008. DOI: 10.1520/
D7425-08.
6.1.1 ASTM designation, year of issue, and title.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.1.2 Type (see 5.2).
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
6.1.3 Sampling, if different (see Section 9).
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 6.1.4 If packaging is other than specified (see 13.1).
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D7425 – 08
TABLE 1 Physical Properties
Requirements
Property Type I Type II
Thermal resistance of 25 mm (1.0 in.) thickness, K·m /W 0.98 (5.6) min 0.72 to 0.98 (4.1 to 5.6)
(°F·ft ·h/Btu) at mean temperature 24°C (75°F), 180 days
Compressive strength, min, KPa (psi) at yield or 10 % deformation 276 (40) 276 (40)
3 3
Density, min, Kg/m (lb/ft ) 40 (2.5) 40 (2.5)
Water absorption, max, volume % 5 5
Tensile strength, min, KPa (psi) 276 (40) 276 (40)
Dimensional stability, max, linear change %, 70°C, +6 +6
97 % RH, 2 weeks
Closed cell content, min, % 90 50
Water vapor permeability, max, ng/Pa·s·(perm-in.) 4.47 (3.02) 4.47 (3.02)
6.1.5 If marking is other than specified (see 13.4). 305 by 305 mm (12 by 12 in.) is cut from the center of the
plywood foam sample as the test specimen. The specimen and
7. Materials and Manufacture
plywood will be cut in such a manner that it will have a knit
7.1 SPF is produced by the catalyzed polymerization of
line. The cut foam height will be 25.4 mm (1 in.) from the
polyisocyanates in the presence of polyhydroxyl compounds,
plywood surface. The test specimen will have smooth edges
with the addition of other compounds such as stabilizers and
free of cracks. All faces shall be flat. Dust shall be blown off
blowing agents.
the sample. Two specimens shall be used for test exposure per
7.2 The materials shall be capable of being mixed and
test. In addition, one sample of the plywood will also be cut to
applied using commercially available polyurethane spray
these dimensions as a control.
equipment.
11. Test Methods
8. Physical Requirements
11.1 Determine thermal resistance in accordance with Test
8.1 SPF used in roofing applications shall meet the mini-
Method C177, Test Method C1363, or Test Method C518 at a
mum physical property values as shown in Table 1.
mean temperature of 24 6 1ºC (75 6 2ºF) and 22ºC (40ºF)
8.2 Other physical properties may be required, as agreed
upon by the purchaser and the manufacturer. minimum temperature gradient. These core specimens shall be
conditioned 24 6 1ºC (75 6 2ºF) and 50 6 5 % relative
9. Sampling
humidity for 180 days. Size of specimens shall be 305 by 305
9.1 Sampling for inspection tests, if required, shall be for
by 2.5 mm (12 by 12 by 1 in.).
properties agreed upon between the manufacturer and the
11.2 Determine comp
...