SIST EN ISO 717-2:2021 PDF

Overview

EN ISO 717-2:2020 - Acoustics: Impact sound insulation specifies how to convert frequency‑dependent impact sound measurement results into standardized single‑number ratings for buildings and building elements. It defines the single‑number quantities used to rate impact (footstep) sound, gives the rules to derive them from laboratory and field measurements, and provides procedures for evaluating how floor coverings and floating floors reduce impact sound. This document is part of the ISO 717 series and is intended to simplify acoustic requirements in building codes and specifications.

Key topics and requirements

• Single‑number quantities: Defines the single‑number rating for impact sound insulation as the value of a reference curve at 500 Hz after the required shifting and then reduced by 5 dB (per the standard definition). An additional evaluation in 0.1 dB steps is indicated when needed to express measurement uncertainty.
• Measurement input bands: Rules for deriving ratings from frequency‑dependent results measured in one‑third‑octave bands (ISO 10140-3, ISO 16283-2) and from octave bands when octave‑band field measurements are used (as allowed in ISO 16283-2).
• Floor coverings and floating floors: Defines single‑number quantities for impact sound reduction produced by coverings or floating floors based on ISO 10140-3 laboratory results and specifies calculation procedures.
• Weighted reduction for lightweight floors: A dedicated procedure to evaluate how coverings reduce impact sound on lightweight floor constructions.
• Spectrum adaptation term (CI): Defines how to account for the unweighted impact sound spectrum (typical walking noise) by applying a spectrum adaptation term where relevant.
• Annexes:
  • Annex A: Rating over an enlarged frequency range (informative)
  • Annex B: Method for bare heavy floors in combination with coverings (informative)
  • Annex C: Example calculations (informative)
  • Annex D: Rating method for heavy and soft impact sources (normative) - new in this edition

Practical applications and users

• Who uses it: Acoustical consultants, building acoustics engineers, test laboratories, manufacturers of floor systems and floor coverings, architects, and authorities writing building codes and specifications.
• Use cases:
  • Producing standardized impact sound ratings for product data sheets and comparison.
  • Specifying acoustic performance requirements in building contracts and codes.
  • Converting laboratory or field measurement results into single‑number values for compliance checks and design decisions.
  • Evaluating the effectiveness of floor coverings or floating floors on different supporting constructions.

Related standards

• ISO 10140-3 (laboratory measurement of impact sound insulation)
• ISO 16283-2 (field measurement of impact sound insulation)
• ISO 10140-1 / -5, ISO 12999-1 (measurement application, facility requirements, uncertainty)

Keywords: EN ISO 717-2:2020, impact sound insulation, sound insulation rating, building acoustics, floor coverings, weighted reduction, ISO 10140-3, ISO 16283-2.