SIST EN ISO 12354-4:2017 PDF

Overview

EN ISO 12354-4:2017 (ISO 12354-4:2017) - Building acoustics - Estimation of acoustic performance of buildings from the performance of elements - Part 4: Transmission of indoor sound to the outside - specifies a calculation model to estimate the sound power level radiated by a building envelope due to airborne sound inside. The model uses measured indoor sound pressure levels and measured element transmission data (façades, windows, openings, transfer elements) to derive the sound radiation from the envelope. These results form the basis for assessing exterior sound levels from a building when combined with other sound sources.

Key topics and technical requirements

• Calculation model & principles: framework for converting indoor sound pressure levels and element transmission properties into equivalent substitute point sound sources on the building envelope.
• Element characterization: use of measured data such as sound reduction index (R) and element normalized level difference (Dn,e) for façades, windows, ducts and openings.
• Determination of sound power: procedures to compute the sound power level for envelope segments and openings, and to apply directivity correction (Dc) for radiation patterns.
• Limitations & accuracy: scope excludes prediction of indoor sound pressure from source descriptions and detailed outdoor sound propagation (Annex E gives a simplified outdoor propagation approach for simple conditions).
• Supporting material: normative references (e.g., ISO 10140-1, ISO 16283-3, ISO 7235), lists of symbols, guidance on interior sound fields, directivity, single-number ratings and a worked calculation example.

Practical applications

• Estimate noise emissions from buildings (façade/window transmission) for environmental impact assessments.
• Support façade and window design decisions to reduce noise radiation to outdoor areas.
• Provide input sound power levels for outdoor noise propagation models and community noise assessments (used together with propagation standards).
• Aid compliance documentation for building regulations and planning consents where façade noise emission is a factor.
• Form the basis for software tools and application documents used by acoustical consultants.

Who should use this standard

• Acoustical consultants and engineers
• Façade and window manufacturers
• Architects and building designers concerned with noise control
• Environmental planners and authorities
• Developers of acoustic prediction software

Related standards

• ISO 10140-1 - Laboratory measurement of sound insulation of building elements
• ISO 16283-3 - Field measurement of airborne sound insulation of façades
• ISO 7235 - Measurement procedures for ducted silencers and air-terminals

EN ISO 12354-4:2017 is intended for acoustical experts and for development of tools and application documents to support building design and environmental noise assessment.