ISO 12354-2:2017 PDF

Overview

ISO 12354-2:2017 - Building acoustics - Estimation of acoustic performance of buildings from the performance of elements - Part 2: Impact sound insulation between rooms - specifies engineering calculation models to predict impact sound insulation in buildings. The standard links measurable element performance (laboratory or field data) with building-level predictions, covering direct and flanking transmission and providing both a detailed frequency‑band model and a simplified single‑number model for practical use.

Key facts:

• Frequency range for the detailed model: 1/3‑octave bands 100 Hz–3150 Hz (optionally extended to 50 Hz with adequate input data).
• Results can be converted to single‑number ratings in accordance with ISO 717‑2.
• The standard defines input quantities, application limits and methods to estimate uncertainty.

Key topics and technical requirements

• Calculation models:
  • Detailed model: band-by-band calculation using measured element data and theoretical propagation in structural elements; accounts for direct and indirect (flanking) transmission paths.
  • Simplified model: restricted application that calculates single‑number ratings directly from element ratings; uncertainty estimation follows methods in ISO 12354‑1:2017 Annex K.
• Input data and quantities: normalized and standardized impact sound pressure levels, reduction by floor coverings, flanking impact levels, mass per unit area and junction characteristics - all defined and referenced to laboratory or field measurement standards.
• Flanking transmission: explicit treatment of flanking elements and junctions; references to laboratory measurement methods for flanking (ISO 10848 series).
• Accuracy and limitations: the standard describes expected accuracy, limitations for atypical constructions, and the need to apply safety margins or additional checks based on local conditions.
• Annexes: informative guidance on low‑frequency extension (Annex E), floating floors (Annex C), stairs (Annex F), measurement examples (Annex G) and symbols.

Practical applications and users

ISO 12354‑2:2017 is used to:

• Predict impact sound insulation for dwellings, multi‑family buildings and similarly dimensioned constructions.
• Support design choices for floor assemblies, floor coverings, floating floors and junction details.
• Inform acoustic specifications, product development and regulatory compliance. Primary users:
• Acoustical consultants and engineers
• Building designers and architects
• Manufacturers of floor systems and resilient layers
• Code authorities and certification bodies
• Software developers producing prediction tools for building acoustics

Related standards

• ISO 12354‑1:2017 (airborne sound prediction & uncertainty)
• ISO 717‑2 (rating of impact sound insulation)
• ISO 10140‑3 (laboratory measurement of impact sound)
• ISO 16283‑2 (field measurement of impact sound)
• ISO 10848‑1/4 (flanking transmission measurement)

Keywords: ISO 12354-2:2017, building acoustics, impact sound insulation, flanking transmission, calculation models, ISO 717-2, normalized impact sound pressure level, tapping machine, frequency bands.