MaTestLab > ASTM Methods > ASTM D1970 Standard Specification for Self-Adhering Polymer Modified Bituminous Sheet Materials Used as Steep Roofing Underlayment for Ice Dam Protection
Last updated 5th March 2026
ASTM D1970 Standard Specification for Self-Adhering Polymer Modified Bituminous Sheet Materials Used as Steep Roofing Underlayment for Ice Dam Protection
ASTM D1970 sets standards for self-adhered, polymer-modified bituminous sheet products for application as roofing underlayment. These products are vital for blocking water penetration from ice dams in steep-slope roofs. The standard requires adhesion, water resistance, low-temperature flexibility, and thermal stability. It requires tests to establish performance under harsh environmental conditions. These sheet membranes are used mainly under main roofing materials, creating a watertight barrier. Conformity with ASTM D1970 provides assurance, longevity, and protection of the roof structure from water damage.
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ASTM D1970 Introduction
In areas where ice accumulation and ice deficiency are common, roof systems require a protective underlayment that can withstand water intrusion under severe weather conditions. The ASTM D1970 addresses this requirement by specifying the performance characteristics for a modified bituminous sheet with polymers such as SBS or APP. These self-harm membranes are applied directly to roof ornamentation and engineered to create a continuous waterproofing. This specification ensures that the material meets specific mechanical and environmental performance criteria, including tensile strength, elongation, peel adhesion, and nail pull. These factors contribute to the ability of materials for freeze-melting cycles, mechanical stress, and prolonged contact with heat or UV light. According to this standard, products are strictly tested for adhesion of various substrates, resistance to thermal cycling, and water penetration under simulated field conditions.
Get Certified ASTM D1970 for Uncompromising Quality and Project Success
ASTM D1970 certification ensures that roofing underlayment materials are waterproof, adhesive, and flexible to strict standards. Compliant will indicate that the membrane is able to act as a form of sealing around fasteners and will be waterproof against snow forming ice damage. The certification increases the credibility of the product and promotes the performance of the roofing systems in the long term.
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ASTM D1970 Testing Procedures and Requirements
Nail Sealability Test
A galvanized roofing nail is driven through the membrane into plywood; the sample is then subjected to water spray to check for leakage.
Low Temperature Flexibility
A specimen is conditioned at -18°C, wrapped around a mandrel, and inspected for cracks or fractures to assess cold-weather performance.
Adhesion to Plywood
The membrane is applied to plywood and peeled back at a 180° angle; the required minimum peel strength must be met or exceeded.
Scope of ASTM D1970
Applications Coverage of self-adhering polymer-modified bituminous underlayments of steep roofing applications.
Gives physical property specifications such as tensile strength, elongation, and low temperature flexibility.
Determines testing on adhesion, moisture resistance, and material durability.
ASTM D1970 Equipment and Sample Preparation
Nail Sealability Specimen
Cut a 300 mm × 300 mm sheet and apply it to 12 mm thick plywood; drive roofing nails and condition at 23°C for 24 hours before testing.
Flexibility Test Specimen
Cut strips 25 mm wide and 150 mm long; condition at -18°C for 2 hours before wrapping around a 25 mm diameter mandrel.
Adhesion Test Specimen
Use 100 mm wide strips adhered to clean, dry plywood; press uniformly and allow to set for 24 hours before peel testing.
Use of ASTM D1970
Protection of ice dams under shingles and other steep-slope roofing.
Roofing: Residential and commercial roofs Secondary water barrier.
Insulation in cold climates where the freeze-thaw cycles prevail.
Common Challenges and Troubleshooting in ASTM D1970
The most common ones are poor surface preparation resulting in poor adhesion, installation at low temperatures that are less than the recommended temperatures, and contamination of the adhesive surface. Unfinished or cracked bonding may decrease the waterproofing. These issues are minimized through the use of clean, dry substrates, observing the temperature instructions given by the manufacturer, and the use of correct installation pressure.
ASTM D1970 Aggregate Testing Method, Procedure, and Data Measuring
The tests involve the determination of tensile strength, elongation, low-temperature flexibility, and adhesive properties. Samples are set to stable environmental conditions before performing the test. Adhesion tests have been used to determine the bonding strength to the substrates, and the water penetration tests to determine the ability to withstand water. The results obtained are tensile values, percentage elongation, temperature performance limits, and adhesion to check compliance.
Analysis Results and Interpretation for ASTM D1970
Test results are compared to the minimum standards set forth by ASTM D1970. Nail sealability provides no visible water leakage, while the results of the flexibility test show no cracking upon bending at low temperatures, which is an indication of how tough the material will be during winter installations. Adhesion strength must meet force requirements to ensure bonding in roofing. When these requirements are not met, membrane rejection or reformulation on the part of the manufacturer can happen.
Problem and the Solution for ASTM D1970
Problem: Ice dams can destroy the roofs and evils of interior structures due to water intrusion as a result of ice dams.
Solution: ASTM D1970 is a standard of performance requirement to establish self-adhering underlayment material to provide dependable waterproofing and extended roof protection.
Factors to Consider us to Test for ASTM D1970
Speed
The efficiency of testing is based on the skills of specimen preparation and conditioning in the environment.
Expertise
Tensile, adhesion, and flexibility tests are supposed to be done by highly qualified technicians who are supposed to do it in the right way, following the conventional guidelines.
Cost
Though there is the cost of testing in laboratories and materials, certification can help in avoiding costly roof collapses and the repair of water damage.
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The required number of samples or specimens should comply with the procedure given in the astm d1970 standard. However, the MaTestLab operations team can assist you for your special requirements once you share your testing details with us.
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The turnaround time for astm d1970 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 d1970 tested?
You can share your astm d1970 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 d1970 test to various testing techniques.
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