Resources & Guides / Building Codes & Standards / ASTM & UL Standards / ASTM D146
ASTM D146
Standard Test Methods for Sampling and Testing Bitumen-Saturated Felts and Woven Fabrics for Roofing and Waterproofing
Overview
ASTM D146 is a procedural standard outlining methods for sampling and evaluating the physical properties of saturated roofing felts and fabrics. These materials, typically saturated with asphalt or coal tar, are foundational components in conventional built-up roofing (BUR) and membrane waterproofing systems. This standard provides the testing framework to verify that these products meet requirements of their respective material specifications (e.g., ASTM D226 for asphalt-saturated organic felts).
Key Test Methods
- Breaking strength: Tensile and tear resistance testing
- Pliability: Ability to bend without cracking at low temperatures
- Moisture content: Critical for preventing blistering in roof systems
- Saturant mass: Percentage verification of proper asphalt saturation
- Weight and dimensional measurements for quality control
Quality Assurance for Built-Up Roofing
A key performance indicator for BUR durability is saturation quality in the felts. An undersaturated felt will be more brittle, more moisture-absorbent, and less weather-resistant. The saturant mass test in ASTM D146 provides quantitative data to ensure the felt has absorbed proper asphalt amounts to perform its waterproofing function. Test results form the basis for approval of concrete mix designs for project use.
Code Compliance Support
ASTM D146 is a testing standard that supports material specifications referenced in IBC Chapter 15 governing roofing assemblies. For products like asphalt-saturated organic felt to comply with ASTM D226, they must be tested according to D146 procedures. When reviewing manufacturer data sheets or third-party test reports for roofing felt, the values for breaking strength, pliability, and saturant mass were determined using this standard's procedures.