ASTM D7158/D7158M Wind Resistance of Asphalt Shingles (Uplift Method)
The ASTM D7158 describes a standard test procedure to find the wind resistance of asphalt shingles by comparing the uplift resistance of a shingle with the estimated uplift force due to wind. The technique is used on shingles that have been sealed in a laboratory-prescribed environment and are installed under the manufacturer. It helps confirm whether the shingle is capable of resisting specific wind speeds and classifies it into wind resistance categories.
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Introduction to ASTM D7158
The ASTM D7158 was created to measure the wind resistance of asphalt shingles in roofing systems, simulating the wind uplift mechanical force. The test is concerned with shingles that are sealed and establishes whether their uplift exceeds the strength of the calculated wind-induced uplift force. In buildings located in areas with high wind exposure, it is crucial to enable manufacturers, contractors, and code officials to ensure that roofing systems are both durable and safe.
ASTM D7158 Test Method
Sample Preparation and Sealing
An asphalt shingle is adhered to a prepared deck using the conventional installation practices. The shingles are thereafter closed in under a controlled environment in order to achieve uniform bonding between the overlapping layers
Uplift Resistance Testing
Once it has been sealed, a mechanical uplift force is progressively applied on each shingle to the top edge with calibrated equipment. The force that the shingle can withstand before being dislodged or rupturing the seal is measured. This uplift resistance, measured, is then cross-referenced against a pre-determined threshold to establish whether the shingle can resist certain wind pressures.
ASTM D7158 Equipment and Sample Preparation
Sample Preparation
A test deck is covered with shingles according to the installation guidelines of the manufacturer and covered with a sealant under specific conditions to standardize a test.
Equipment
The mechanical testing system uses a vertical uplifting force to identify the maximum force that the sealed shingle can sustain without detaching or losing seals.
ASTM D7158 Test Results and Interpretation
The result of interest is the value of uplift resistance (in N or lbf), which is compared with the computed wind uplift force. A shingle passes the test of a particular class of wind speed when the resistance measured exceeds the calculated uplift force at the specific wind velocity. The classification helps users select shingles rated to meet the expected wind rating for their location.
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Tests Related to ASTM D7158
ASTM D 7158 is related to tests like ASTM D3161 for wind resistance of steep slope roofing, ASTM D5205 for windload resistance of rigid plastic siding, and ASTM D6381 for adhesion of asphalt under air stress.
Use of ASTM D7158 Testing in Various Industries
Residential and commercial Roofing: This provides durability and shingles, and compliance with wind load codes.
Building Code Compliance: Assists building code officials and building inspectors in determining that roofing products comply with the necessary performance requirements
Manufacturers: It can be used to certify and label products with the wind resistance ratings, giving better market confidence.
Challenges in ASTM D7158 Testing
Challenges include poor sealing of shingles, incorrect calculation of wind force, or contamination of samples. The field factors, such as dirt, out-of-tolerance fasteners, and slope, can influence sealing and performance but fall outside of the scope of the test. High-quality sealing, calibration, and following ASCE exposure assumptions are required to obtain reliable results.
Importance of ASTM D7158
ASTM D7158 is significant since it makes sure that asphalt shingles are of a certain wind resistance level that can protect the buildings against the effects of wind. It enables manufacturers to rate and mark shingles in terms of the wind rating so as to facilitate safer roofing decisions during construction and renovation.
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The turnaround time for astm d7158 test methodology depends upon the test procedure mentioned in the standard test document. However, we at MaTestLab understand your research requirements and hence try to get your test completed within the least possible time.
Where can I get the astm d7158 tested?
You can share your astm d7158 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific astm d7158 test to various testing techniques.
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