Classroom Acoustic Design in France — NRA 2000 Requirements
Primary and secondary school classrooms, lecture rooms. Typical volume: 150-300 m³.
What NRA 2000 Requires for a Classroom in France
Regulation: Arrêté du 25 avril 2003 — ERP acoustics
RT60 target: ≤ 0.6s
Background noise limit: ≤ 35 dBA
Local note: French education buildings (ERP) have specific RT60 targets by room type.
How to Calculate NRA 2000 Compliance for a Classroom in France
- 1
Identify the applicable France standard and target
Look up NRA 2000 for classroom spaces in France. The RT60 target is ≤ 0.6s. Arrêté du 25 avril 2003 — ERP acoustics.
- 2
Measure or model the room geometry
Record the length, width, and height of the room to calculate the volume. A typical classroom has a volume of 150-300 m³.
- 3
List all surfaces and their absorption coefficients
For each surface (floor, ceiling, walls, windows, doors), find the absorption coefficient at each octave band frequency (125 Hz to 4 kHz) from ISO 354 test data or a materials database.
- 4
Calculate total absorption and apply the Sabine or Eyring equation
Sum all surface absorption values: A = sum of (alpha x area). Then apply T60 = 0.161 x V / A (Sabine) or T60 = -0.161 x V / (S x ln(1 - alpha_avg)) (Eyring). Use Eyring when average alpha exceeds 0.20.
- 5
Compare result against NRA 2000 and specify treatment
If the calculated RT60 exceeds the target of ≤ 0.6s, specify additional absorption. Typical treatment cost in France is €17,000–€25,000.
Cost of Compliance in France
Treatment Cost Range
€17,000–€25,000
Currency: €
What Affects Cost
- • Room volume and surface area
- • Target standard strictness
- • Existing acoustic conditions
- • Finish and material quality
Frequently Asked Questions
What RT60 does NRA 2000 require for a classroom in France?
NRA 2000 requires a reverberation time of ≤ 0.6s for classroom spaces in France. Arrêté du 25 avril 2003 — ERP acoustics. Measurement should be performed per ISO 3382-2 methodology.
What is the background noise limit for a classroom in France?
The background noise limit is ≤ 35 dBA under NRA 2000. This typically refers to HVAC and building services noise measured with the room unoccupied.
How much does acoustic treatment cost for a classroom in France?
Typical acoustic treatment for a classroom in France costs €17,000–€25,000. Costs vary based on finish quality, room size, and existing conditions.
Calculate NRA 2000 Compliance for Your Classroom in France
Enter your room dimensions, select materials, and instantly verify compliance against NRA 2000. Free, no signup required.
Open Free RT60 Calculator