Standards Articles
ANSI S12.60: Classroom Acoustic Performance Requirements
Complete guide to ANSI S12.60-2010 classroom acoustics — RT60 limits, background noise criteria, room volume thresholds, and compliance strategies.
ASHRAE Noise Criteria for HVAC Systems: NC, RC, and Design Limits
Master ASHRAE HVAC noise criteria — NC curves, RC Mark II method, design limits by room type, duct noise calculation, and common specification errors.
BB93: Acoustic Design of Schools — Complete Compliance Guide
Master BB93:2015 acoustic design of schools — RT60 limits, indoor ambient noise levels, sound insulation, and the performance standards approach.
BS 8233:2014 Sound Insulation & Noise Reduction — The Definitive Guide
Complete guide to BS 8233:2014 sound insulation and noise reduction for buildings — indoor ambient noise levels, criteria tables, and field compliance.
DIN 18041: German Acoustic Quality Classes A, B, C Explained
Complete guide to DIN 18041 acoustic quality classes — Class A (music), B (speech), C (communication). Room types, RT60 targets, and compliance.
IEC 60268-16: Measuring Speech Intelligibility (STI/STIPA)
A practical guide to IEC 60268-16 speech intelligibility measurement — STI and STIPA methods explained, equipment requirements, field measurement procedures, and common interpretation errors.
ISO 3382: The Complete Guide to Room Acoustic Measurement
Master ISO 3382 room acoustic measurement — RT60, EDT, C50, C80 parameters explained with field examples, equipment lists, and common pitfalls.
ISO 354: How Acoustic Materials Are Tested — And Why NRC Can Lie
The truth about ISO 354 reverberation room testing — how absorption coefficients are measured, why NRC values above 1.0 exist, and how to avoid specification errors.
ISO 717: Sound Insulation Rating Systems (Rw, STC, Dnt,w) Decoded
Decode ISO 717 sound insulation ratings — how Rw, STC, DnT,w, and L'nT,w are calculated, why lab and field values differ, and how to avoid the flanking transmission trap.
NBR 15575: Brazilian Building Acoustic Performance Standard
Understanding Brazil's NBR 15575 acoustic requirements — minimum, intermediate and superior performance levels, measurement methods, and residential building compliance.
NCC Section J & AS/NZS 2107: Australian Acoustic Requirements
Complete guide to Australian acoustic standards — NCC 2022 sound insulation, AS/NZS 2107 design sound levels, DTS vs performance paths, and compliance.
WELL v2 Feature S01 (Sound): The Calculation Method Explained
How to calculate WELL v2 Sound Feature S01 compliance — RT60 targets, background noise, STC requirements, and the performance verification path.
Acoustic Regulations by Country — 12 Nations Compared | AcousPlan
Acoustic building regulations compared across 12 countries: UK, US, Germany, France, Australia, Brazil, Sweden, Singapore, Japan, Canada, India, UAE — standards, metrics, and minimums.
Approved Document E — UK Sound Insulation Requirements Guide | AcousPlan
Approved Document E guide: DnT,w and L'nT,w targets for new-build and conversions, pre-completion testing requirements, Robust Details scheme, and common compliance failures.
BREEAM HEA 05 Acoustic Performance — Requirements & Credits Guide | AcousPlan
BREEAM HEA 05 acoustic requirements: up to 3 credits for noise levels, sound insulation, and RT60. Credit thresholds, evidence requirements, and compliance strategy guide.
EN 12354 Building Acoustics — Prediction Methods for Sound Insulation | AcousPlan
EN 12354 building acoustics standard guide: Parts 1–6 explained, flanking transmission prediction, input data requirements, and how software implements EN 12354 calculations.
IBC Acoustic Requirements — STC & IIC Minimums for US Buildings | AcousPlan
IBC 2021 Section 1207 acoustic requirements: STC 50 between dwelling units, IIC 50 for impact noise, state amendments, hotel and mixed-use requirements, compliance failures.
AS 2107 Australia: Recommended Design Sound Levels — Complete Reference
AS/NZS 2107:2016 specifies recommended background noise levels for all major Australian building types. This complete reference covers every room category, measurement method, and relationship to NCC 2022 compliance.
ASHRAE HVAC Noise Control: Handbook Chapter Summary for Acoustic Designers
ASHRAE HVAC Applications Chapter 49 is the authoritative guide for mechanical noise control in buildings. This summary covers RC/NC curve criteria, duct noise calculation, equipment selection, and silencer design for acoustic designers.
ASTM C423 Absorption Testing: Test Method, Mounting Types, and Why Results Vary
ASTM C423 is the US standard for measuring sound absorption coefficients in a reverberation room. This guide explains the test method, mounting types A–J, NRC calculation, and why the same product can yield very different results.
DIN 4109 German Sound Insulation: Requirements, Calculation Methods, and Compliance
DIN 4109:2018 is Germany's mandatory building acoustics standard covering airborne and impact sound insulation for residential, educational, and office buildings. This guide covers every requirement table and calculation procedure.
ASTM E492 Impact Insulation Class (IIC): Test Method, Rating Procedure, and Compliance
ASTM E492 defines the laboratory test method for Impact Insulation Class (IIC) of floor-ceiling assemblies. This guide covers the tapping machine procedure, IIC rating calculation, field vs. lab gaps, and code requirements.
ISO 16283 Field Sound Insulation: Complete Guide to Parts 1, 2, and 3
ISO 16283 replaces ISO 140 Parts 4, 5, and 7 for field sound insulation testing. This clause-by-clause guide covers airborne, impact, and facade measurement — with acceptance criteria and reporting requirements.
LEED v4.1 EQ Credit Acoustic Performance: Requirements, Paths, and Documentation
LEED v4.1 EQ Credit Acoustic Performance requires RT60, background noise, and sound isolation compliance. This guide covers all credit paths, point allocations, prerequisite vs. credit requirements, and documentation checklists.
NBR 15575 Brazil: Residential Acoustic Performance Requirements Explained
NBR 15575:2021 is the Brazilian performance standard for residential buildings, covering airborne sound insulation, impact noise, and background noise limits for facades and internal partitions across three performance levels.
NRA France: Nouvelle Réglementation Acoustique — Complete English Guide
The Nouvelle Réglementation Acoustique (NRA) is France's mandatory acoustic standard for new residential construction. This English guide covers all DnT,A and L'nT,w requirements, the arrêté du 30 juin 1999, and compliance verification.
WHO Environmental Noise Guidelines 2018: Thresholds, Evidence, and Design Implications
The WHO Environmental Noise Guidelines for the European Region (2018) set evidence-based exposure limits for road, rail, aircraft, wind turbine, and leisure noise. This guide explains every threshold and its health basis.
Approved Document E Acoustics — What Part E Actually Requires for New Buildings
Approved Document E specifies airborne sound insulation (DnT,w + Ctr ≥ 45 dB) and impact sound (L'nT,w ≤ 62 dB) for separating walls and floors in new dwellings. This guide covers every requirement, Robust Standard Details, pre-completion testing, and a worked example for a terraced house party wall.
AS/NZS 2107:2016 Acoustic Design Guide — Every Room Type, Every Australian Standard
AS/NZS 2107:2016 specifies recommended and maximum noise levels for over 40 room types in Australian buildings. This is the complete guide with every table, the relationship to NCC Volume 1, measurement methodology, and a worked example for a 100 m² Australian office fitout.
BB93 School Acoustic Design Guide 2015 — Every Classroom Type, Every Requirement
BB93:2015 specifies acoustic requirements for 14 distinct room types in UK schools — from standard classrooms (RT60 ≤ 0.6s) to SEN rooms (≤ 0.4s). This is the complete guide with every table, every IANL limit, compliance evidence, and a worked example for a new-build primary school.
BREEAM Hea 05 Acoustic Performance — How to Earn All 4 Credits
BREEAM Hea 05 awards up to 4 credits for acoustic performance in offices, schools, hospitals, and residential buildings. Only 12% of BREEAM Excellent projects earn all 4 credits. This guide covers every credit level, evidence requirements, and a worked example for a BREEAM Excellent office.
DIN 18041:2016 Complete Guide — Quality Classes, Room Groups, Calculation Method
DIN 18041:2016 classifies rooms into 5 quality classes (A1–A5) with volume-dependent RT60 targets. This complete guide covers every quality class, the calculation method per §6, comparison with ISO 3382, and a worked example for a 200 m³ German classroom.
Green Star IEQ-4 Acoustic Comfort Credits — Complete Guide for Australian Projects
Green Star Design & As Built v1.3 awards up to 3 points for acoustic comfort under IEQ-4. This guide covers every credit pathway, AS/NZS 2107 integration, NCC Section F5 requirements, and a worked example for a 5 Star Green Star office in Sydney.
HTM 08-01 Healthcare Acoustic Design — NHS Requirements for Every Room Type
HTM 08-01 specifies acoustic performance requirements for NHS healthcare premises — from hospital wards (NR 35–40) to operating theatres (NR 35) to MRI suites. This guide covers every room type, speech privacy considerations, sound insulation, and a worked example for an NHS outpatient clinic.
ISO 3382-1 for Concert Halls: Every Parameter, Every Measurement Method, Every Target
ISO 3382-1:2009 defines 10 room acoustic parameters for performance spaces — T30, EDT, C80, D50, Ts, G, LF, IACC, and more. This guide covers every parameter's definition, JND, measurement setup, and target ranges for symphonic halls, chamber music, and opera houses.
LEED v4.1 EQ Acoustic Performance Credit — Complete Guide to Earning 2 Points
The LEED v4.1 EQ Acoustic Performance credit awards up to 2 points for background noise control, RT60 compliance, and sound insulation. This guide covers every requirement path, NC curve calculations, documentation needs, and a worked example for a 3-storey office targeting LEED Gold.
NABERS IEQ Acoustic Performance — Design Guide for Australian Office Buildings
NABERS Indoor Environment (IE) ratings assess acoustic performance as one of four comfort pillars in Australian office buildings. This guide covers the acoustic assessment methodology, star rating thresholds, the relationship to AS/NZS 2107, and a worked example for a 2,000 m² Sydney CBD office.
ANSI/ASA S12.60 Complete Guide: American Classroom Acoustics Standard
ANSI S12.60-2010 is the American standard for classroom acoustics, specifying maximum RT60 (0.6s), maximum background noise (35 dBA), and minimum STI (0.60). Here is every requirement explained with calculation examples, compliance methods, and how it compares to BB93 and DIN 18041.
BB93:2015 Complete Guide: UK School Acoustics Standard
Building Bulletin 93 (BB93:2015) sets the acoustic requirements for all school buildings in England and Wales. It specifies RT60 limits, background noise levels (BNL), and sound insulation — all mandatory under Building Regulations. Here is every requirement, room type, and compliance method.
IEC 60268-16 Complete Guide: Speech Transmission Index (STI) Standard
IEC 60268-16:2020 defines the Speech Transmission Index — the definitive metric for speech intelligibility in rooms. Here is every aspect of the standard explained: the STI calculation method, STIPA measurement procedure, quality scale, and how building codes worldwide use it.
ISO 3382 Complete Guide: Room Acoustics Measurement and Parameters
ISO 3382 is the international standard for measuring and evaluating room acoustics. Part 1 covers performance spaces, Part 2 covers ordinary rooms, Part 3 covers open plan offices. Here is every parameter, measurement method, and requirement explained — with the specific clause references you need for compliance documentation.
WELL v2 Feature 74 (Sound) Complete Guide: Every Requirement, Threshold, and Compliance Path
WELL v2 Feature 74 has three parts: Sound Mapping (RT60), Sound Barriers (background noise), and Sound Masking (speech privacy/STI). Here is every threshold, every space type, every measurement condition, and the compliance pathway for each part — from precondition to optimization.
WELL v2 Feature 74 Decoded: Every Acoustic Requirement, Every Calculation, Every Clause
WELL Building Standard v2 Feature 74 has three parts with different requirements for RT60, background noise, and speech privacy. Most WELL assessors fail Part 3 because the speech privacy STI calculation is never written down in one place — until now.