ISO 10848-3:2017

Overview

ISO 10848-3:2017 - Acoustics - Laboratory and field measurement of flanking transmission - Part 3 - defines measurement methods for Type B elements when the junction between elements has a substantial influence on sound transmission. It complements the frame document ISO 10848‑1 by specifying both laboratory and field procedures to quantify flanking transmission for airborne, impact and building‑service‑equipment sound paths where the junction behaviour is decisive.

Key outcomes of the standard include measured quantities such as normalized flanking level difference (Dn,f,ij), normalized flanking impact sound pressure level (Ln,f,ij), normalized flanking equipment sound pressure level (Lne0,f,ij) and the normalized direction‑average vibration level difference (Dv,ij,n). Results are intended for product comparison, specification of requirements, or as input to prediction methods (for example ISO 12354‑1 and ISO 12354‑2).

Key topics and requirements

• Scope and application: Applies to structurally connected Type B elements as defined in ISO 10848‑1; covers laboratory tests with suppressed unwanted flanking and field tests that characterise in‑situ performance.
• Measured quantities: Dn,f,ij, Ln,f,ij, Lne0,f,ij and Dv,ij,n are expressed in decibels and depend on element dimensions and junction length (reference length l0 = 1 m; reference absorption area A0 = 10 m2).
• Instrumentation and excitation: Uses airborne excitation, a standardised tapping machine or a calibrated structure‑borne source; instrumentation must meet ISO 10848‑1 requirements.
• Test arrangement: Laboratory facilities follow ISO 10848‑1; field tests require documentation of the connected building structure. Minimum room volume for sound pressure measurements is 25 m3.
• Shielding and installation: Shielding techniques are required for airborne excitation and receiving‑room measurements; soft resilient interfaces prevent unwanted vibration transfer at boundaries.
• Procedures, precision and reporting: Frequency ranges and detailed procedures reference ISO 10848‑1. Results must be reported for all measured frequencies (one‑third‑octave) with graphical presentation (log‑frequency scale; recommended plotting: 5 mm per one‑third octave and 20 mm per 10 dB).

Practical applications and users

• Who uses it: acoustical test laboratories, building acoustics consultants, façade and floor system manufacturers, HVAC/equipment manufacturers, specifiers and regulatory bodies.
• Use cases:
  • Compare product junction performance (lab tests) and verify in‑situ behaviour (field tests).
  • Provide input data for sound insulation prediction models (ISO 12354 series).
  • Support specifications, contract requirements and compliance testing for building acoustic performance.

Related standards

• ISO 10848‑1 (frame document)
• ISO 12354‑1 and ISO 12354‑2 (prediction of sound insulation)
• ISO 717‑1 / ISO 717‑2 (rating of sound insulation)
• ISO 12999‑1 (measurement uncertainties)
• ISO 10140 series (report forms and procedures)

Keywords: ISO 10848-3:2017, flanking transmission, Type B elements, junction, building acoustics, normalized flanking level difference, laboratory and field measurement.