Classroom Acoustic Design in India — WELL v2 Feature 74 Requirements
Primary and secondary school classrooms, lecture rooms. Typical volume: 150-300 m³.
What WELL v2 Feature 74 Requires for a Classroom in India
Regulation: WELL v2 Feature 74
RT60 target: ≤ 0.6s
Background noise limit: ≤ 35 dBA
STI requirement: ≥ 0.60
Local note: Indian international schools increasingly pursue WELL/IGBC certification.
How to Calculate WELL v2 Feature 74 Compliance for a Classroom in India
- 1
Identify the applicable India standard and target
Look up WELL v2 Feature 74 for classroom spaces in India. The RT60 target is ≤ 0.6s. WELL v2 Feature 74.
- 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 WELL v2 Feature 74 and specify treatment
If the calculated RT60 exceeds the target of ≤ 0.6s, specify additional absorption. Typical treatment cost in India is ₹18,000–₹28,000/m².
Cost of Compliance in India
Treatment Cost Range
₹18,000–₹28,000/m²
Currency: ₹
What Affects Cost
- • Room volume and surface area
- • Target standard strictness
- • Existing acoustic conditions
- • Finish and material quality
How WELL v2 Feature 74 Differs from Other Standards for Classroom in India
| Requirement | WELL v2 Feature 74 | NBC 2016 |
|---|---|---|
| RT60 Target | ≤ 0.6s | 0.4–0.6s |
| Background Noise | ≤ 35 dBA | 30–35 dBA |
| STI | ≥ 0.60 | Not specified |
| Cost Range | ₹18,000–₹28,000/m² | ₹14,000–₹22,000/m² |
Frequently Asked Questions
What RT60 does WELL v2 Feature 74 require for a classroom in India?
WELL v2 Feature 74 requires a reverberation time of ≤ 0.6s for classroom spaces in India. WELL v2 Feature 74. Measurement should be performed per ISO 3382-2 methodology.
What is the background noise limit for a classroom in India?
The background noise limit is ≤ 35 dBA under WELL v2 Feature 74. This typically refers to HVAC and building services noise measured with the room unoccupied.
How much does acoustic treatment cost for a classroom in India?
Typical acoustic treatment for a classroom in India costs ₹18,000–₹28,000/m². Costs vary based on finish quality, room size, and existing conditions.
Calculate WELL v2 Feature 74 Compliance for Your Classroom in India
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