What roofing underlayment acronyms really mean

By Jesse Sanchez 

Understanding key testing and approval standards can help contractors evaluate underlayment performance, code compliance and consistency. 

Roofing underlayment datasheets can be packed with acronyms, but those letters represent more than technical fine print. IPG - Intertape Polymer Group highlights how standards and approvals can help identify whether an underlayment is code-compliant, accepted by inspectors and tested for specific performance characteristics. 

The American Society for Testing and Materials (ASTM) establishes several benchmarks. ASTM D8257 addresses synthetic underlayments, including tensile strength, tear resistance, shrinkage and ultraviolet stability. ASTM D226 and D4869 were originally developed for traditional asphalt felt and provide additional performance benchmarks for synthetic products. 

Code compliance adds another layer. Acceptance Criteria 188 (AC188) defines testing requirements for modern synthetic underlayments that do not fit older felt-based codes. A Code Compliance Research Report (CCRR) confirms that a product has passed AC188 and complies with International Building Code (IBC) and International Residential Code (IRC) requirements. 

Regional and fire-rating approvals can also be important. Florida Building Code (FBC) approval verifies durability under conditions including extreme heat, high humidity and heavy wind. A Miami-Dade Notice of Acceptance (NOA) evaluates resistance to extreme wind uplift in High-Velocity Hurricane Zones. ASTM E108 testing can establish a Class A fire rating. 

IPG also emphasizes that achieving initial product certification is only the first step. Delivering consistent quality and material performance, lot after lot, helps establish the trust clients expect from a supplier. Buyers and contractors are encouraged to look for continuous compliance, third-party audits and manufacturers with a record of maintaining standards across production runs. NovaSeal® and Palisade are identified as trusted brands focused on dependable, repeatable quality. 

Before selecting an underlayment, contractors can check for a current CCRR or equivalent code report, AC188 evaluation for synthetic products, applicable regional approvals, a Class A fire rating and evidence of consistent compliance. Those considerations can help contractors evaluate products, including NovaSeal® and Palisade, beyond the acronyms on a datasheet. 

Ultimately, these standards provide a framework for understanding what an underlayment has been tested and approved to do, while consistent manufacturing helps ensure that performance carries from one production run to the next. 

Learn more about roofing underlayment standards and ECP products at ECP!