ASTM C957/C957M is the ASTM standard specification for a high-solids content, cold liquid-applied elastomeric waterproofing membrane with an integral wearing surface. It provides a technical framework for evaluating a waterproofing membrane system intended to both protect a surface from water intrusion and serve as a durable wearing layer. For specifiers, contractors, and product purchasers, this standard helps define a consistent basis for product selection, quality control, and compliance review.

Purpose of ASTM C957/C957M

The purpose of ASTM C957/C957M is to establish specification requirements for a cold-applied, liquid membrane system that forms a waterproof barrier and includes an integral wearing surface. As a product specification, it is used to support consistent evaluation of materials, expected performance characteristics, and acceptance criteria tied to the membrane system. ASTM C957/C957M is especially relevant when a project needs a waterproofing solution that can also function as a finished surface, making the standard useful in procurement and technical submittal review.

Common use cases of ASTM C957/C957M

This standard is commonly used for projects that specify a liquid-applied elastomeric waterproofing membrane with a finished wearing surface, particularly where application at cold temperatures or without hot materials is desirable. It may be referenced in project specifications, material submittals, product data sheets, and quality assurance documentation. ASTM C957/C957M is also useful when comparing membrane products that claim similar waterproofing and wear-layer performance, helping teams align material selection with the intended application method and service conditions.

Why ASTM C957/C957M matters

ASTM C957/C957M matters because it gives buyers and specifiers a clear reference for evaluating a specialized waterproofing membrane system. By using a recognized ASTM standard, project teams can improve consistency in procurement, reduce ambiguity in performance claims, and support more reliable quality control. The standard also helps narrow product comparisons to materials that are intended to meet the same technical framework, which can reduce installation risk and support better long-term service expectations.

• High-solids, cold liquid-applied membrane
• Elastomeric waterproofing system
• Integral wearing surface
• Specification and procurement reference
• Quality control and product comparison