Classroom Acoustic Design in United States — 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 United States
Regulation: WELL v2 Feature 74
RT60 target: ≤ 0.6s
Background noise limit: ≤ 35 dBA
STI requirement: ≥ 0.60
Local note: 85 WELL-certified schools in US as of 2026.
How to Calculate WELL v2 Feature 74 Compliance for a Classroom in United States
- 1
Identify the applicable United States standard and target
Look up WELL v2 Feature 74 for classroom spaces in United States. 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 United States is $25,000–$38,000 per classroom.
Cost of Compliance in United States
Treatment Cost Range
$25,000–$38,000 per classroom
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 United States
| Requirement | WELL v2 Feature 74 | ANSI S12.60 |
|---|---|---|
| RT60 Target | ≤ 0.6s | ≤ 0.6s unoccupied |
| Background Noise | ≤ 35 dBA | ≤ 35 dBA |
| STI | ≥ 0.60 | ≥ 0.60 |
| Cost Range | $25,000–$38,000 per classroom | $22,000–$32,000 per classroom |
Frequently Asked Questions
What RT60 does WELL v2 Feature 74 require for a classroom in United States?
WELL v2 Feature 74 requires a reverberation time of ≤ 0.6s for classroom spaces in United States. WELL v2 Feature 74. Measurement should be performed per ISO 3382-2 methodology.
What is the background noise limit for a classroom in United States?
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 United States?
Typical acoustic treatment for a classroom in United States costs $25,000–$38,000 per classroom. Costs vary based on finish quality, room size, and existing conditions.
Calculate WELL v2 Feature 74 Compliance for Your Classroom in United States
Enter your room dimensions, select materials, and instantly verify compliance against WELL v2 Feature 74. Free, no signup required.
Open Free RT60 Calculator