ASTM C957/C957M-17(2024)

Overview

ASTM C957/C957M-17(2024), titled Standard Specification for High-Solids Content, Cold Liquid-Applied Elastomeric Waterproofing Membrane with Integral Wearing Surface, provides requirements and test methods for cold liquid-applied elastomeric membranes used to waterproof building decks not subjected to hydrostatic pressure. This specification focuses on membrane systems with an integral wearing surface, commonly utilized for both pedestrian and vehicular traffic, as well as in high-abrasion settings. Its objective is to ensure quality and performance for membranes that must maintain watertight seals in demanding environments.

Key aspects include defining material properties, thicknesses, test methods for performance, and application guidelines. The standard is governed by ASTM Committee D08 on Roofing and Waterproofing and adheres to internationally recognized standardization principles.

Key Topics

• Scope and Purpose
  • Outlines required properties for cold liquid-applied elastomeric waterproofing membranes with an integral wearing surface.
  • Applicable to pedestrian and vehicular traffic areas and high-abrasion applications.
• Material Composition and Application
  • Membrane systems may be single or multi-component and typically consist of one or more coats.
  • The base coat provides the primary waterproofing function, while top coats add resistance to wear and environmental exposure.
  • Aggregates can be included to improve wear and skid resistance.
• Physical and Mechanical Requirements
  • Membranes must cure into an elastomeric film that seals against water penetration, even in the presence of minor substrate cracks.
  • Required minimum dry film thickness for tested performance is 0.5 mm [0.020 in.].
• Performance Testing
  • Test methods cover weight loss, crack bridging at low temperatures, adhesion-in-peel (to substrates like cement mortar and plywood), chemical and weathering resistance, tensile and elongation retention, abrasion resistance, and stability.
  • Specific attention given to adhesion after water exposure and resistance to chemicals such as ethylene glycol and mineral spirits.
• Safety and Units
  • The standard includes a safety caveat for users to establish appropriate health, safety, and environmental practices.
  • Values are provided in both SI and inch-pound units; users must not mix the two measurement systems.

Applications

The high-solids content, cold liquid-applied elastomeric waterproofing membranes specified in ASTM C957/C957M-17(2024) are essential in the following areas:

• Building Decks: Waterproofing solutions for exposed decks, including areas supporting foot and vehicle traffic, such as parking structures and pedestrian walkways.
• High-Abrasion Environments: Suitable for locations requiring a wear-resistant surface that also provides durable waterproofing.
• New Construction and Renovation: Used in both new structures and the refurbishment of existing surfaces needing a waterproof yet robust membrane.
• Customizable Systems: Adaptable to various substrate types (such as cement mortar or plywood) and application thicknesses, as established by the membrane manufacturer.

The specification does not address skid resistance or fire retardance; however, these performance criteria may be relevant for specific projects or regulatory requirements.

Related Standards

ASTM C957/C957M-17(2024) references several related ASTM standards to ensure comprehensive assessment of membrane materials:

• ASTM C501: Test Method for Relative Resistance to Wear of Unglazed Ceramic Tile by the Taber Abraser
• ASTM C794: Test Method for Adhesion-in-Peel of Elastomeric Joint Sealants
• ASTM C1305/C1305M: Test Method for Crack Bridging Ability of Liquid-Applied Waterproofing Membrane
• ASTM C1442: Practice for Conducting Tests on Sealants Using Artificial Weathering Apparatus
• ASTM D412: Test Methods for Vulcanized Rubber and Thermoplastic Elastomers-Tension
• ASTM D471: Test Method for Rubber Property-Effect of Liquids
• ASTM D2370: Test Method for Tensile Properties of Organic Coatings

Additional references and comprehensive definitions are provided through related ASTM terminology standards.

Keywords: high-solids elastomeric membrane, liquid-applied waterproofing, integral wearing surface, ASTM C957/C957M, building deck waterproofing, abrasion resistance, high-abrasion waterproofing systems, cold-applied membrane, membrane waterproofing standard