Plasterboard 12 mm Round, No Insulation, No MLV
The same build measured twice on different days.
Tests
2
Repeat Test
Rw range
7–8dB
spread 1 dB
Highest Rw
8dB
22 Sep 2026 (Project071)
Largest ΔRw vs first
+1dB
22 Sep 2026 (Project071)
Sound reduction index
R′ from the 2270, re-referenced to the 0.9216 m² specimen area (−0.35 dB). Grey lines: reference bounds.
Single-number ratings
Open in explorer| Varies | Test | Rw | C | Ctr | ΔRw vs first | ΔRw vs open | Mean R | |
|---|---|---|---|---|---|---|---|---|
| 3 Jul 2026 (Project003) | Project003 | 7 | 0 | 0 | ref. | +7 | 8.3 | |
| 22 Sep 2026 (Project071) | Project071 | 8 | 0 | 0 | +1 | +8 | 8.6 |
Rw, C and Ctr per ISO 717-1 over 100–3150 Hz. ΔRw fits the reference curve to the band-by-band difference curve, which is not the same number as subtracting two separately rounded Rw values. Mean R is the arithmetic mean over the 16 rating bands.