SIST EN ISO 10848-4:2018 PDF

Overview

EN ISO 10848-4:2017 - "Acoustics - Laboratory and field measurement of flanking transmission … Part 4: Application to junctions with at least one Type A element" - specifies measurement methods to characterise flanking transmission for airborne, impact and building service equipment sound where at least one element in the tested junction is a Type A element (see ISO 10848‑1). The standard covers both laboratory tests (with suppressed external flanking paths) and field measurements (in situ performance where full suppression is usually not possible). Results support product comparison, specification limits and input to prediction methods such as ISO 12354‑1 and ISO 12354‑2.

Key topics and technical requirements

• Performance metric: the primary quantity is the vibration reduction index (Kij) - a direction-averaged velocity level difference across the junction normalized to junction length and equivalent absorption lengths of the elements.
• Measurement environments:
  • Laboratory measurements: quantify junction performance with suppressed flanking transmission from the test structure.
  • Field measurements: describe in‑situ performance of the installed junction; results are representative of that particular building structure.
• Instrumentation & procedures: instrumentation and general test procedures conform to ISO 10848‑1 (Clause 5 and Clause 6 references). Structural reverberation time and velocity-level measurements are required.
• Type A element considerations:
  • Boundary conditions strongly influence behaviour.
  • Modal analysis parameters (mode count, modal density) and the modal overlap factor (M) are important for measurement accuracy. The standard requires checking modal overlap to ensure reliable results.
• Reporting & use of results: test reports must describe building connections for field tests. Measured data can be used to compare products, set requirements or feed prediction models.

Applications and users

• Practical uses:
  • Designing and validating junctions between floors, walls and building services to limit flanking transmission.
  • Supplying input data for acoustic prediction models (ISO 12354 series) used in building performance assessments.
  • Product development and third‑party acoustic testing of partitions, junction details and building elements.
• Typical users:
  • Acoustic consultants and building‑acoustics engineers
  • Accredited test laboratories and manufacturers of building elements
  • Specifiers, façade and partition designers, and compliance assessors

Related standards

• ISO 10848‑1:2017 (frame document and instrumentation/procedure requirements)
• ISO 12354‑1 / ISO 12354‑2 (prediction of airborne and impact sound insulation)
• ISO 12999‑1 (measurement uncertainty in building acoustics)

Keywords: EN ISO 10848-4:2017, flanking transmission, building acoustics, vibration reduction index, Type A element, laboratory and field measurements, sound insulation, ISO 12354.