Worked Example: Hospital Reception — Waiting Area Acoustics
RT60 calculation for a hospital reception and waiting area. Vinyl flooring and glazed entrance create challenges that Armstrong ceiling tiles and limited wall panels address, achieving compliance within the generous hospital target.
A 240 m³ hospital ward designed to BS-8233 requires RT60 ≤ 1s. With Armstrong Ultima+ on the ceiling and Fabric-wrapped panel 50mm on walls, the calculated RT60 is 0.45s — PASS.
Room Setup
Total surface area: 269.2 m². Calculation method: Sabine equation (ISO 3382-2:2008 Annex A).
Surface Materials
| Surface | Material | Area (m²) | NRC |
|---|---|---|---|
| ceiling | Armstrong Ultima+ | 80.0 | 0.80 |
| walls-main | Painted plaster | 78.0 | 0.04 |
| walls-treatment | Fabric-wrapped panel 50mm | 12.0 | 0.80 |
| floor | Vinyl/linoleum floor | 80.0 | 0.03 |
| windows | Double glazing 6mm | 12.0 | 0.04 |
| door | Solid timber door | 7.2 | 0.08 |
Absorption coefficients sourced from manufacturer datasheets and ISO 354 test reports. Browse the full acoustic materials database.
Step-by-Step Calculation
- 1
Room Volume
V = L × W × H = 10 × 8 × 3 = 240 m³
- 2
Total Surface Area
Stotal = 80.0 + 78.0 + 12.0 + 80.0 + 12.0 + 7.2 = 269.2 m²
- 3
Absorption per Surface at 500 Hz
ceiling: 80.0 m² × 0.85 = 68.00 Sabins
walls-main: 78.0 m² × 0.04 = 3.12 Sabins
walls-treatment: 12.0 m² × 0.78 = 9.36 Sabins
floor: 80.0 m² × 0.03 = 2.40 Sabins
windows: 12.0 m² × 0.04 = 0.48 Sabins
door: 7.2 m² × 0.08 = 0.58 Sabins
- 4
Total Absorption at 500 Hz
Atotal = 68.00 + 3.12 + 9.36 + 2.40 + 0.48 + 0.58 = 83.94 Sabins
- 5
Sabine RT60 at 500 Hz
RT60 = 0.161 × V / A = 0.161 × 240 / 83.94 = 0.46s
- 6
Compare to Target
Mid-frequency RT60 (avg of 500, 1k, 2k Hz) = 0.45s. Target: ≤ 1s per BS-8233. Verdict: PASS
Octave Band Results
| Frequency | 125Hz | 250Hz | 500Hz | 1kHz | 2kHz | 4kHz |
|---|---|---|---|---|---|---|
| Total Absorption (Sabins) | 27.0 | 60.5 | 83.9 | 90.2 | 86.7 | 82.9 |
| RT60 (s) | 1.43 | 0.64 | 0.46 | 0.43 | 0.45 | 0.47 |
| Target (s) | — | — | 1.00 | 1.00 | 1.00 | — |
| Verdict | — | — | PASS | PASS | PASS | — |
Compliance Verdict
Reference: BS 8233:2014 Table 4; HTM 08-01
Hospital reception areas need controlled RT60 for clear announcements and speech privacy at the desk. Vinyl flooring is mandated for wheelchair access and infection control. The 1.0s target is achievable with ceiling-only treatment in most cases.
STI result: 0.66 (per IEC 60268-16:2020)
Cost Estimate
Costs are indicative and vary by region, supplier, and installation complexity. For a detailed cost breakdown, use the AcousPlan calculator.
Open the AcousPlan calculator pre-loaded with the exact room dimensions (10m × 8m × 3m) and RT60 target (1s).
Open CalculatorField Story
Reception staff at a district general hospital report that patients cannot hear their names being called, leading to missed appointments and frustration. The reception area has vinyl flooring, a large glazed entrance, and plaster walls displaying NHS information posters. An acoustic ceiling was installed during the last refurbishment, but only limited wall treatment was included. Elderly patients with age-related hearing loss are disproportionately affected. The acoustic consultant recommends additional fabric panels above the seating area and an induction loop system for hearing aid users, bringing the acoustic environment to a comfortable standard for all visitors.
Frequently Asked Questions
What RT60 does a Hospital Reception — Waiting Area Acoustics achieve?
With the specified materials and dimensions (10m x 8m x 3m, volume 240m3), the calculated mid-frequency RT60 is 0.45s using the Sabine equation. The target under BS-8233 is 1s or less. The result is a PASS.
What materials are used in this healthcare acoustic example?
This example uses Armstrong Ultima+ on the ceiling (NRC 0.8), Painted plaster on the walls-main (NRC 0.04), Fabric-wrapped panel 50mm on the walls-treatment (NRC 0.8), Vinyl/linoleum floor on the floor (NRC 0.03), Double glazing 6mm on the windows (NRC 0.04), Solid timber door on the door (NRC 0.08). The total absorption at 500 Hz is 83.9 Sabins.
How much does acoustic treatment cost for this room?
The estimated treatment cost is £4,416 for 92 m2 of absorptive material at approximately £48/m2. Actual costs vary by region, supplier, and installation complexity.
Related Examples
Hospital Ward — BS 8233 Patient Recovery
GP Consulting Room — Speech Privacy Design
Operating Theatre — Cleanroom Acoustic Design
Dental Surgery — Acoustic Treatment for Anxiety
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All calculations are advisory and based on the Sabine equation (ISO 3382-2:2008 Annex A). Results require professional verification for compliance submissions. Absorption coefficients are sourced from manufacturer datasheets and ISO 354 test reports.