Overview
ISO 19323:2018 - Timber structures - Joist hangers - Test methods defines standardized laboratory procedures to measure the mechanical performance of preformed three‑dimensional joist hangers. The standard covers methods to determine vertical load, axial (tension) load, torsional moment capacity and deflection characteristics for hangers used primarily to secure one timber member to another (headers may be timber, concrete or masonry). It focuses on test setups, specimen preparation, instrumentation and reporting to ensure repeatable, comparable results.
Key topics and technical requirements
- Test types specified
- Vertical load test (peak load and deflection behaviour)
- Tension/axial load test
- Torsional load test (moment and rotation measurements)
- Cyclic vertical load test
- Materials & specimen preparation
- Test apparatus & measurement
- Calibrated testing machines and force measurement per ISO 7500‑1
- Displacement transducers and defined test fixtures for consistent load application
- Sampling, failure modes and reporting
- Guidance on specimen selection, minimum waiting period after assembly, and avoiding timber defects at hanger locations
- Detailed test-report requirements to document loads, deflections, rotations and material properties
- Limitations & notes
- Structural steel headers are not covered
- Consideration of rotation of the supported member about its longitudinal axis as a secondary mechanism
Practical applications and intended users
ISO 19323 is essential for:
- Joist hanger manufacturers - product development, performance validation and production quality control
- Independent testing laboratories - performing standardized tests for certification and compliance
- Structural engineers and specifiers - obtaining reliable capacity and stiffness data for design and connection selection
- Certification bodies and building authorities - harmonized evidence for product approval, labeling and code compliance
- Forensic analysts - reproducing failure modes and load capacities in investigations
Typical uses include design verification, selection of appropriate hangers and fasteners, preparation of product data for technical approvals, and comparative testing across models.
Related standards (normative references)
Relevant referenced standards include ISO 8970, ISO 13061‑1 / ISO 13061‑2, ISO 1920‑4 / ISO 1920‑6, ISO 9652‑4, ISO 10984‑1 / ISO 10984‑2, ISO 7500‑1 and test-method guidance for materials and instrumentation. These provide complementary procedures for timber, concrete/masonry, fasteners and equipment calibration.