ASTM D226/D226M is the ASTM standard that covers asphalt-saturated organic felt used in roofing and waterproofing. It provides a technical basis for evaluating this material class so buyers, specifiers, and manufacturers can reference a common specification when comparing products. By focusing on the felt’s intended use in protective building assemblies, the standard helps support consistent product selection, quality control, and compliance-focused procurement.

Purpose of ASTM D226/D226M

The purpose of ASTM D226/D226M is to define requirements for asphalt-saturated organic felt intended for roofing and waterproofing applications. As a product specification, it gives a shared framework for assessing whether the material is suitable for its intended function in building envelope work. This helps reduce ambiguity during ordering, testing, and acceptance. It is commonly used when a project needs a recognized standard for material description, performance-related expectations, and documentation.

Common use cases of ASTM D226/D226M

This standard is commonly referenced for roofing underlayment and related waterproofing applications where asphalt-saturated organic felt is specified. It may appear in procurement documents, product submittals, material testing programs, and project specifications for roof and moisture-protection systems. ASTM D226/D226M is also useful when comparing products from different suppliers, since it helps align material descriptions and acceptance criteria for the same general product type.

Why ASTM D226/D226M matters

ASTM D226/D226M matters because it supports more consistent evaluation of asphalt-saturated organic felt used in roofing and waterproofing. For contractors, designers, and purchasers, a recognized standard can simplify compliance checks and reduce the risk of using mismatched materials. It also helps with quality control by giving a common reference for product review and documentation. In practice, that can improve confidence in material selection and project coordination.

• Specification for asphalt-saturated organic felt
• Roofing and waterproofing applications
• Useful for procurement and submittals
• Supports material comparison and acceptance
• Helps align quality control practices