ASTM D7281-07(2021)

Standard Test Method for Determining Water Migration Resistance Through Roof Membranes

SIGNIFICANCE AND USE
5.1 This test method provides a means of evaluating roof membranes, seams, and laps for resistance to water migration from standing water on the roof. This test method evaluates roof membranes when first applied and also after simulated deterioration caused by the ultraviolet energy of the sun.
SCOPE
1.1 This test method covers the determination of water migration resistance of roof membranes including built-up roof membranes, modified bitumen, and single-ply roof membranes. The procedures were developed to determine the potential for leakage of water through the roof membranes resulting from a standing head of water and when pressurized with air from the underside.  
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 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

• Status: Published
• Publication Date: 31-Oct-2021
• ICS: 91.100.50 - Binders. Sealing materials
• Technical Committee: D08 - Roofing and Waterproofing
• Drafting Committee: D08.20 - Roofing Membrane Systems

Relations

• Refers: ASTM G154-12 - Standard Practice for Operating Fluorescent Ultraviolet (UV) Lamp Apparatus for Exposure of Nonmetallic Materials
• Effective Date: 01-Dec-2012
• Refers: ASTM G154-06 - Standard Practice for Operating Fluorescent Light Apparatus for UV Exposure of Nonmetallic Materials
• Effective Date: 05-Jun-2006
• Refers: ASTM G154-04 - Standard Practice for Operating Fluorescent Light Apparatus for UV Exposure of Nonmetallic Materials
• Effective Date: 01-Oct-2004
• Refers: ASTM G154-00a - Standard Practice for Operating Fluorescent Light Apparatus for UV Exposure of Nonmetallic Materials
• Effective Date: 10-Jun-2000
• Refers: ASTM G154-00 - Standard Practice for Operating Fluorescent Light Apparatus for UV Exposure of Nonmetallic Materials
• Effective Date: 10-Jun-2000
• Refers: ASTM G154-00ae1 - Standard Practice for Operating Fluorescent Light Apparatus for UV Exposure of Nonmetallic Materials
• Effective Date: 10-Jun-2000

Overview

ASTM D7281-07(2021) - Standard Test Method for Determining Water Migration Resistance Through Roof Membranes - provides a reliable method to evaluate the ability of various roofing membranes, seams, and laps to resist water migration. Developed and maintained by ASTM International, this standard is essential for manufacturers, contractors, and building owners aiming to verify the durability and waterproofing performance of roofing materials, including built-up, modified bitumen, and single-ply roof membranes.

This test method assesses both newly installed membranes and those that have been subject to simulated aging, helping to predict long-term resistance to leaks due to standing water and environmental stress. The results offer critical data for product quality assurance, specification compliance, and risk mitigation in roofing system selection.

Key Topics

• Water Migration Resistance: Evaluates the potential for water leakage through roof membranes when exposed to standing water and pressurized air from underneath.
• Material Coverage: Applies to built-up roof membranes, modified bitumen, and single-ply membrane systems.
• Testing After Weathering: Assesses membranes both as-installed and after exposure to ultraviolet radiation and condensation cycles to simulate real-world aging conditions.
• Leak Detection Protocol: Membranes are subjected to a seven-day immersion under a standing head of water, followed by cycles of pressurization and visual inspection for leakage.
• Sample Preparation: Includes procedures for incorporating standard field seams, ensuring practical evaluation of joints and overlaps.
• Reporting Requirements: Outlines strict documentation on materials, conditioning, test dates, pass/fail result, and any observations.

Applications

The ASTM D7281-07(2021) test method supports a wide range of roofing industry applications:

• Product Development and Certification: Manufacturers use this standard to compare product performance, improve formulations, and demonstrate compliance with industry benchmarks.
• Project Specifications: Architects and specifiers refer to this standard to ensure selected roof membranes provide adequate water migration resistance, especially in environments prone to ponding or frequent rain.
• Quality Control: Contractors implement this test during installation and periodic maintenance to verify workmanship and membrane integrity.
• Risk Mitigation: Building owners and facility managers use test data to select systems with proven longevity and leak resistance, reducing future repair costs and downtime.
• Regulatory Compliance: Helps stakeholders meet safety, health, and environmental obligations aligned with internationally recognized principles set by the WTO Technical Barriers to Trade Committee.

Related Standards

For a comprehensive evaluation of roofing materials, consider these related ASTM standards and guidelines:

• ASTM G154: Practice for Operating Fluorescent Ultraviolet (UV) Lamp Apparatus for Exposure of Nonmetallic Materials - referenced for accelerated aging in the D7281 procedure.
• ASTM D08: Series of standards on roofing and waterproofing systems.
• Other International and National Standards: Refer to local building codes and industry standards that may require or cite ASTM D7281 for roof membrane performance assessment.

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Keywords: water migration resistance, roof membrane testing, roof leakage, ASTM D7281, waterproofing, roofing systems, building envelope, modified bitumen, built-up roof, single-ply membrane, water penetration, weathering resistance, construction standards, quality assurance.

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: D7281 − 07 (Reapproved 2021)
Standard Test Method for
Determining Water Migration Resistance Through Roof
Membranes
This standard is issued under the fixed designation D7281; 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 3.1.2 batten—a narrow band or plate that is used to fasten or
prevent the displacement of a single-ply membrane.
1.1 This test method covers the determination of water
3.1.3 delamination—separation between lamination or
migration resistance of roof membranes including built-up roof
bonded material or component; for example, laminated layers
membranes, modified bitumen, and single-ply roof mem-
of rigid insulation or the felt plies in a built-up roof.
branes. The procedures were developed to determine the
potential for leakage of water through the roof membranes
3.1.4 field seam—a splice made in the field of a single-ply
resulting from a standing head of water and when pressurized
membrane that joins two sheets together using an adhesive,
with air from the underside.
splicing tape, heat, or solvent-welding.
1.2 The values stated in SI units are to be regarded as the
3.1.5 mechanically fastened membranes—a single ply or
standard. The values given in parentheses are for information
base ply (part of a multi-layer system) membrane that has been
only.
positively attached at intervals to the substrate, usually with
fasteners and/or other mechanical devices, such as battens.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
3.1.6 NPT—National Pipe Thread.
responsibility of the user of this standard to establish appro-
4. Summary of Test Method
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
4.1 Roofing membranes are conditioned and installed in the
1.4 This international standard was developed in accor- leakage test apparatus (Fig. 1).A152-mm (6-in.) head of water
dance with internationally recognized principles on standard-
is maintained over the sample for seven days at ambient
ization established in the Decision on Principles for the conditions, 21 °C (70 °F). At the end of the seven-day period,
Development of International Standards, Guides and Recom-
air shall be introduced into the bottom section of the apparatus,
mendations issued by the World Trade Organization Technical
increasing the pressure to 6.9 kPa (1 psig) and immediately
Barriers to Trade (TBT) Committee.
released to ambient conditions.This cycle is repeated 25 times.
2. Referenced Documents
5. Significance and Use
2.1 ASTM Standards:
5.1 This test method provides a means of evaluating roof
G154 Practice for Operating Fluorescent Ultraviolet (UV)
membranes, seams, and laps for resistance to water migration
Lamp Apparatus for Exposure of Nonmetallic Materials
from standing water on the roof. This test method evaluates
roof membranes when first applied and also after simulated
3. Terminology
deterioration caused by the ultraviolet energy of the sun.
3.1 Definitions:
6. Apparatus
3.1.1 adhere—to cause two surfaces to be held together by
adhesion. Roof membranes are often “partially” or “totally
6.1 The test apparatus consists of top section, a support
adhered” to a substrate.
plate, and a bottom section, which are clamped together with
the sample being evaluated placed as a diaphragm between the
This test method is under the jurisdiction ofASTM Committee D08 on Roofing
top sections and the support plate.
and Waterproofing and is the direct responsibility of Subcommittee D08.20 on
6.1.1 The top section consists of a 203-mm (8-in.) diameter,
Roofing Membrane Systems.
6-mm ( ⁄4-in.) wall thickness by 203-mm (8-in.) length of clear
Current edition approved Nov. 1, 2021. Published November 2021. Originally
acrylic pipe, which is cemented to a 305-mm (12-in.) diameter
approved in 2007. Last previous edition approved in 2013 as D7281 – 07 (2013).
DOI: 10.1520/D7281-07R21.
flange.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.1.2 The support plate is a round poly(vinyl chloride) plate,
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
1 1
6-mm ( ⁄4-in.) thick and a 241-mm (9 ⁄2-in.) diameter with
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 6-mm ( ⁄4-in.) diameter holes spaced 25 mm (1 in.) on center.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D7281 − 07 (2021)
FIG. 1 Leakage Test Apparatus
6.1.3 The bottom section consists of a 305-mm (12-in.) be increased and released; the other hole provides a connection
diamet
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