ASTM C1063-23 PDF

Overview

ASTM C1063-23, published by ASTM International, sets forth the minimum technical requirements and best practices for the installation of lathing and furring systems to support Portland cement-based plaster in both interior and exterior applications. These systems are crucial in ensuring the stability, durability, and performance of plaster finishes on a variety of substrates in residential, commercial, and institutional construction. The standard covers specifications for the use of metal plaster bases, accessories, channels, hangers, fasteners, and installation methods to ensure the integrity and longevity of the finished assembly.

Key Topics

• Material Requirements: The standard outlines acceptable materials for lathing and furring systems, such as galvanized expanded metal lath, welded and woven wire lath, steel and PVC accessories, rods, channel runners, hangers, nails, screws, and clips.
• Material Handling: Clear guidance is provided on the delivery, storage, and protection of lathing and furring materials to prevent corrosion, damage, or contamination before and during installation.
• Substrate Preparation: Criteria for substrate flatness, stability, moisture content, and marking requirements are included to ensure optimal adhesion and performance of the plaster finish.
• Installation Practices: The document covers procedures for installing furring on walls and suspended ceilings, attachment of plaster bases and accessories, proper lapping and securing of metal lath, spacing and positioning of fasteners, and the use of control and expansion joints.
• Accessory Application: Detailed requirements for installing essential lathing accessories include weep screeds for drainage, casing beads, internal and external corner reinforcements, control joints, and expansion joints.
• Fire and Sound Performance: Directions for compliance with applicable fire resistance and sound control requirements, referring to established test methods and standards.

Applications

The practical value of ASTM C1063-23 lies in its wide range of applications for modern building construction:

• Residential and Commercial Buildings: Ensures uniform quality and safety in the installation of cement-based plaster systems on walls and ceilings, both inside and outside buildings.
• New Construction and Renovation: Provides guidelines useful for both new projects and the repair or retrofit of existing structures to ensure compliance and long-term durability.
• Moisture and Drainage Management: Offers best practices for water-resistive barriers and the integration of accessories that facilitate drainage, reducing the risk of water intrusion and structural damage.
• Structural Movement Accommodation: Recommends the use and placement of control and expansion joints to manage building movement and prevent unintended plaster cracking.
• Specialty Environments: Applicable for buildings in environments exposed to salt air, industrial pollution, high humidity, or moisture, where material selection and installation details are critical for lasting performance.
• Compliance and Inspection: The specification enables architects, contractors, builders, and inspectors to standardize the quality and approach for cement plaster lath installations, reducing errors and improving inspection efficiency.

Related Standards

Several other ASTM and industry standards are referenced or closely related to ASTM C1063-23, including:

• ASTM C926: Specification for the application of Portland cement-based plaster, frequently used alongside C1063 for comprehensive system performance.
• ASTM C847: Specification for metal lath, governing the manufacturing and properties of metal plaster bases.
• ASTM C933 and C1032: Specifications for welded and woven wire plaster bases.
• ASTM C1280: Requirements for exterior gypsum panel products used as sheathing.
• ASTM C1861: Specification for lathing and furring accessories and fasteners.
• ASTM E90: Standard test method for sound transmission loss, pertinent for sound-rated assemblies.
• PS 1 and PS 2: DOC Voluntary Product Standards for structural plywood and wood-based panels.
• ANSI/AWC NDS: National Design Specification for Wood Construction, relevant for wood framing systems.

By following the requirements in ASTM C1063-23, construction professionals enable high-quality, durable, and code-compliant installations of Portland cement plaster systems, ensuring reliable building envelope performance.