ASTM D4068-17(2022) PDF

Overview

ASTM D4068-17(2022) is the authoritative standard specification developed by ASTM International for flexible chlorinated polyethylene (CPE) sheeting used as concealed water-containment membranes. These CPE membranes are essential in construction scenarios susceptible to secondary damage from water leaks and where long-term reliable performance is required. Notably, the standard applies to installations where the membrane becomes inaccessible after the initial construction, such as fountains, pools, planters, shower pans, and tile tubs. ASTM D4068 does not cover membranes intended for applications exposed to direct sunlight or ultraviolet (UV) light.

Key Topics

• Material Requirements: The sheeting must be predominantly composed of CPE resin made from linear polyethylene, ensuring an amorphous structure for flexibility and resilience. Manufacturing defects like pinholes, blisters, and foreign particles must be absent.
• Recycled Materials: The use of recycled materials is permitted, provided they meet all specified requirements. Water-soluble components are strictly prohibited to maintain membrane integrity.
• Physical Properties: Standardized tests cover key material properties including:
  • Tensile strength and ultimate elongation
  • Tear resistance and puncture resistance
  • Bonded seam strength
  • Low-temperature flexibility and chemical resistance
  • Resistance to microorganisms and hydrostatic pressure
  • Dimensional tolerances, thickness consistency, and pinhole absence
• Testing and Quality Control: Detailed procedures ensure quality and performance, with ongoing quality assurance and sampling expected at regular intervals.
• Workmanship and Marking: Finished CPE sheeting must be homogeneous, monolithic, have straight, clean edges, and bear clear, durable markings for identification.

Applications

ASTM D4068 specified CPE sheeting plays a crucial role in diverse water-containment applications where leakage can result in costly secondary damage and where accessing the membrane for repair or inspection is not feasible post-installation. Common applications include:

• Swimming Pools: Provides a waterproof barrier beneath tile or other finishes.
• Fountains and Water Features: Ensures long-term containment of water, preventing leaks that may damage structures or landscaping.
• Planted Areas (Planters): Acts as a root and moisture barrier, protecting underlying structures from water intrusion.
• Shower and Safe Pans, Tile Tubs: Used beneath finished surfaces to direct any leaked water toward drains, reducing risk of moisture damage in residential and commercial bathrooms.

The standard's focus on long-term performance makes these membranes ideal for high-risk or high-value structures where water containment is critical.

Related Standards

For a comprehensive approach to plastic sheeting selection and water-containment membrane installation, consider these related ASTM standards:

• ASTM D412 – Test Methods for Tension of Vulcanized Rubber and Thermoplastic Elastomers
• ASTM D543 – Practices for Chemical Resistance of Plastics
• ASTM D618 – Conditioning Plastics for Testing
• ASTM D751 – Test Methods for Coated Fabrics
• ASTM D1004 – Tests for Tear Resistance of Plastic Film and Sheeting
• ASTM D1203 – Tests for Volatile Loss from Plastics
• ASTM D2136 – Low-Temperature Bend Test for Coated Fabrics

While there is no direct ISO equivalent, these ASTM standards provide a robust framework for quality assurance and performance verification in water-containment construction.

By following ASTM D4068, manufacturers, designers, and specifiers can ensure that concealed water-containment membranes provide durable, reliable protection against leaks, safeguarding property and maintaining structural integrity over time. This standard is vital for ensuring quality and efficiency in the construction industry’s water-proofing practices.