ASTM E2140 Standard Test Method for Water Penetration of Metal Roof Panel Systems by Static Water Pressure Head
What is ASTM E2140?
ASTM E2140 is a standard test method for determining the resistance of exterior metal roof panel systems to water penetration when a specified static water pressure head is applied to the roof panel’s outside surface. The method focuses on leaks from panel side seams, endlaps, and roof-plane penetrations that are easy to identify as the leak source. The test evaluates water-barrier or hydrostatic roof system joints and details, not water-shedding performance. It may be used with single-skin metal panels, the exterior skin of factory-assembled composite panels, and the exterior skin of field-assembled composite roof systems where the test setup eliminates perimeter leakage from leakage through panel joints. ASTM E2140 (Standard Test Method for Water Penetration of Metal Roof Panel Systems by Static Water Pressure Head) is a controlled laboratory procedure for observing water leakage under a defined water head.
Get Certified ASTM E2140 Testing for Reliable Water Penetration Evaluation
Under controlled laboratory conditions, metal roof panel systems are tested for resistance to water penetration using a specified static water pressure head. Experienced staff assemble and seal the specimen in a horizontal test chamber and set up the desired water head. Technicians scan for leaks at side seams, endlaps, penetrations, and other areas of interest on the underside of the specimen. Engineers and analysts use the observations to evaluate water-barrier performance and compare the test results with applicable project or product requirements.
What is the scope of ASTM E2140?
ASTM E2140 provides for the laboratory testing of resistance to water penetration through side seams, endlaps, and roof-plane penetrations of exterior metal roof panel systems under a specified static pressure head applied to the exterior face of the roof panel. The method is applicable under conditions where the leakages can be easily identified, and the side seams and attachments are visible. The method is designed for water barrier roof joints and details, including hydrostatic roof systems.
Material: Exterior metal roof panel systems, including single-skin metal panels and exterior skins of factory-assembled or field-assembled composite roof systems.
Objective: To measure the resistance of roof panel joints and roof plane details to water penetration under a specific static water pressure head.
Property measurement: Water leakage through the plane of the innermost face of the assembled roof panel specimen during the test period.
Method: Mount the roof panel specimen on a horizontal frame, create a water perimeter dam, add a water load, and check for leakage on the underside of the specimen.
Result: Record the applied water pressure head and whether water leakage occurs during the specified observation period.
Test limitations: The test method does not assess roof perimeter conditions, wind-driven-rain resistance, or structural adequacy. It can only be used for specimens in which leakage can be seen easily.
Environmental conditions: Controlled laboratory conditions with a defined static water head. Leakage observations are recommended using room temperature water to reduce the condensation effect.
Applications: This method can be used to evaluate hydrostatic metal roof systems, side seams, endlaps, roof plane penetrations, fasteners, curbs, pipes, and expansion joints.
What are the uses of ASTM E2140 testing?
ASTM E2140 is a controlled laboratory test to assess the resistance of a metal roof panel assembly to water penetration during static water submersion. It’s especially helpful in hydrostatic or water-barrier roof systems where joint or penetration information needs to be assessed. This standard-
Evaluates water leakage through metal roof panel side seams.
Tests panel end laps at a constant water pressure.
Offers a controlled condition of submersion for a hydrostatic roof.
Helps evaluate the effectiveness of roof-panel joints, seals, and installation details.
Assists in product development and lab quality assurance.
Provides data for comparison with project-specific or manufacturer requirements.
Assesses leak points and weak points in the roof system.
Which Materials Can Be Tested Under ASTM E2140?
ASTM E2140 is used for assembled exterior metal roof panel systems, such as single-skin metal panels and the exterior skin of factory-assembled or field-assembled composite systems. The test specimen should represent the actual roof construction, including the same materials, details, seals, construction methods, and anchorage specified by the manufacturer.
Why is ASTM E2140 important?
ASTM E2140 is important because water leakage through roof-panel joints can affect the weather-tightness and service performance of metal roof systems. The method offers controlled exposure of side seams, endlaps, and penetrations on roof panels to standing water and allows observation of leakage through the inner face of the specimen.
ASTM E2140 Equipment and Sample Preparation Guide
ASTM E2140 uses a well-sealed horizontal test chamber or box with a perimeter support ledge, a vertical water dam, and a means of observing the underside of the test specimen. The specimen is firmly secured and closed in the chamber so that the applied water head is maintained without unwanted perimeter leakage.
Personnel identify the complete assembled metal roof panel system, including panels, side seams, end laps, penetrations, seals, attachments, and supporting components relevant to the test.
Sample Preparation
Skilled personnel assemble the specimen using the same materials, details, seals, construction methods, and anchorage specified by the manufacturer’s standard written or illustrated instructions.
Specimen Dimension
Test specimens must represent a minimum panel width of 72 inches and length of 96 inches with complete seam and joint details.
Instrumentation
The laboratory uses a well-sealed horizontal test chamber or box with a perimeter support ledge, vertical water dam, specimen anchorage, perimeter seals, and a means of viewing the underside of the specimen.
Testing Procedures and Requirements for ASTM E2140
According to ASTM E2140, the specimen shall be assembled and secured to a horizontal support frame or test chamber. The water reservoir is created around the specimen with vertical water dams, and the bottom surface is open to checking for leakage. Other reference ASTM documents include E631 and E1646. The complete procedure for ASTM E2140 is summarized below:
Personnel assemble the full-size roof panel specimen using the specified materials, panel details, seals, construction methods, and anchorage. Technicians mount and anchor the specimen to the horizontal test chamber perimeter support.
Water Dam and Leakage ObservationPreparation
Personnel establish a well-sealed vertical water dam around the specimen perimeter. Analysts ensure that all areas beneath the specimen can be viewed so that water leakage through the innermost face can be detected and recorded.
Initial Water and Principal Water Head
Technicians load the specimen to approximately 3 in. (75 mm) of water pressure head and maintain the water level for a minimum of 5 min. After the preliminary condition, technicians increase the water pressure head to 6 in. (150 mm).
Static Exposure and Leakage Observation
Personnel maintain the 6 ± 0.2 in. (150 ± 5 mm) water pressure head for 6 h. Room-temperature water is recommended to reduce condensation that could interfere with leakage observations. Analysts record the water pressure head and observe the inside face of the roof panel specimen at specified observation times, including 1 h, 3 h, and immediately before test termination.
Test Termination and Post-Test Inspection
The test ends after 6 h or when water leakage is observed on the inside face of the roof panel specimen. After removing the water, personnel observe and record the condition of the panels, panel endlaps, and panel side seams.
Reporting
Laboratories report the specimen description, construction details, applied water pressure head, exposure duration, leakage observations, and relevant post-test conditions.
ASTM E2140 Testing Process and Data Collection
The ASTM E2140 testing process consists of assembling and sealing the roof specimen, establishing the water dam, applying the preliminary water head, increasing the head to the principal test level, maintaining the specified water head, and observing the underside for water leakage. The test measures how well roof panels and joints resist static water immersion, not resistance to wind-driven rain. The data record should include the following information: specimen configuration, panel and joint information, water pressure head, exposure time, observation times, leakage location, and end lap, side seam, and panel post-test condition. For comparisons to be reliable, the specimens must be installed in the same manner and the water head properly controlled.
ASTM E2140 Testing Procedure Using Static Water Pressure Head
Common Challenges and Troubleshooting
Accurate results in ASTM E2140 rely on representative specimen construction, proper sealing, stable control of water head, reliable observation of leakage, and correct installation of panel joints and penetrations. Unwanted perimeter leakage can interfere with identification of leakage through the roof system, so technicians should inspect and repair perimeter seals during the preliminary water-head stage. Room-temperature water is recommended because condensation may interfere with observations. Analysts should maintain the principal water head at 6 ± 0.2 in. (150 ± 5 mm) and record leakage at the specified observation times. Results should also be interpreted carefully because field performance depends on installation, supporting construction, roof slope, aging, corrosion, vibration, thermal cycling, and other service conditions.
ASTM E2140 Analysis Results and Interpretation
ASTM E2140 provides observations of water leakage through metal roof panel systems under a controlled static water pressure head. Analysts use observations to evaluate the water-barrier performance of side seams, endlaps, penetrations, and related roof details while considering the specimen configuration and test conditions.
Laboratories report the applied water pressure head, normally 6 ± 0.2 in. (150 ± 5 mm) during the principal exposure, together with the exposure duration and leakage observations.
Technicians record the primary water-penetration result together with the specimen identification, roof-panel configuration, side seams, end laps, and roof-plane penetrations evaluated.
Analysts document the test configuration, specimen installation, perimeter-seal condition, water-head control, observation times, leakage location, and post-test condition of the roof components.
Engineers and analysts compare the observed water-leakage performance with applicable project specifications, manufacturer requirements, contractual criteria, or other established acceptance requirements.
ASTM E2140 tests the ability of exterior metal roof panel systems to resist water penetration under a specified static water pressure head. It centers on side seams, end laps, and roof-plane openings.
How long does the principal ASTM E2140 test last?
The principal exposure lasts 6 h, unless water leakage occurs earlier on the inside face of the roof panel specimen.
When is water leakage observed?
During the principal exposure, personnel observe the inside face of the specimen at specified times, including 1 h, 3 h, and immediately before test termination.
Divakar Shukla is an Electrical and Electronics Engineer specializing in the convergence of embedded systems architecture, industrial automation, and applied artificial intelligence. Know More
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