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Materials and data

Acoustic materials and assemblies

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BimCraft Rooms › Acoustics: a BRAS floor and ceiling picked for a room, each labelled estimated or measured
BimCraft Rooms › Acoustics: a BRAS floor and ceiling picked for a room, each labelled estimated or measured
The finish list with the add-on on: the built-in typical values, then the BRAS sets
The finish list with the add-on on: the built-in typical values, then the BRAS sets

Overview

Acoustic materials adds 53 sets of sound absorption and scattering values, 125 Hz to 4 kHz, to BimCraft's room acoustics material lists. Each set says whether it is measured or estimated and where it came from. They come from the BRAS benchmark (TU Berlin and RWTH Aachen, CC BY-SA 4.0). Sound reduction values for walls and floors (R, STC, IIC) are not in this version.

Who it’s for

  • Acousticians and architects who want room results based on cited material data.
  • Anyone who needs to see where a number came from before they use it.

What you can do

  • Pick any of the 53 sets in BimCraft's Rooms › Acoustics material lists: concrete, plaster, windows, floors, ceilings, seating, wall panels, an absorber, MDF sheets, a ceiling tile and anechoic-chamber tiles.
  • See for each set whether it is measured (impedance tube or in-situ) or estimated for the benchmark rooms, and the scattering values next to the absorption.
  • Switch it off to go back to the short built-in list.

Methods and standards

BRAS gives third-octave values. Each of the six octave bands the engine uses is the mean of its three third-octaves (125 Hz is 100, 125 and 160 Hz, and so on). Nothing else is changed. The set's origin text is BRAS's own.

Data and sources

Data and sources. BRAS, the Benchmark for Room Acoustical Simulation, 'Surface descriptions': Aspöck, Brinkmann, Ackermann, Opdam, Vorländer and Weinzierl, TU Berlin DepositOnce, https://depositonce.tu-berlin.de/items/38410727-febb-4769-8002-9c710ba393c4, licence CC BY-SA 4.0 (the data file stays under it). Paper: Brinkmann et al., 'A benchmark for room acoustical simulation. Concept and database', Applied Acoustics 176 (2021). 5 sets are measured and 48 are estimated or fitted to a measured reverberation time for BRAS's own rooms. The list of sources is also in the add-on's DATA-SOURCES.md.

Verification

tools/acoustics-test/materials-pack-test.mjs checks that every set has six absorption and six scattering values between 0 and 1, a basis, an origin and the source, and that the engine reverberation reads them. It checks the data's shape, not the physics: BRAS's own room-set values were mostly estimated by its authors.

Limits

A design aid, not a certified measurement. The room-set values describe BRAS's benchmark rooms and not the actual products. Impedance-tube values are normal incidence, not the random-incidence ISO 354 value. No sound reduction (R, STC, IIC) data yet: no openly licensed laboratory table was found, and the engine's mass-law estimates stay marked estimated. We do not hold the liability for a design: have a licensed acoustician or engineer review your drawings and results.

Files and formats

materials.json (the sets, with source and basis on each), main.js (adds them to the material list), DATA-SOURCES.md, LICENSE (Apache-2.0 for the code).

Get started

  1. Add it from the Library, then switch it on in Settings › Add-ons in BimCraft.
  2. Open Rooms › Acoustics and pick a set from a material list; the label ends with [measured] or [estimated].

Languages

No languages are listed for this add-on yet. Its maker may add some.

Works in

EditionWorksNote
Browser (/use) (yours) Added on demand Fetched the first time you use it, then kept for offline use.
Studio from getcadcraft.com Added on demand Fetched the first time you use it, then kept for offline use.
Microsoft Store Added on demand Fetched the first time you use it, then kept for offline use.
Google Play Added on demand Fetched the first time you use it, then kept for offline use.
iPad and iPhone (App Store) Added on demand Fetched the first time you use it, then kept for offline use.
Custom build Added on demand Fetched the first time you use it, then kept for offline use.

Comes with

Adding it brings these too. Engines are shared: each downloads once for every add-on that uses it.

Needed by: Acoustical engineering.

Versions

VersionChannelDateWhat changed
0.1.1stableOctober 31, 2026Signed and published.
0.1.0stableOctober 31, 2026Signed and published.

Licence and maker

CadCraft (CadCraft, first-party). Licence: Apache-2.0. Dependencies carry their own licences, listed on their pages.