Plasterboard Non-Perforated (10 mm), No Insulation, No MLV
The same build measured twice on different days.
Tests
2
Repeat Test
Rw range
23–24dB
spread 1 dB
Highest Rw
24dB
22 Sep 2026 (Project074)
Largest ΔRw vs first
+2dB
22 Sep 2026 (Project074)
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 | |
|---|---|---|---|---|---|---|---|---|
| 25 Aug 2026 (Project069) | Project069 | 23 | −1 | −1 | ref. | +23 | 20.8 | |
| 22 Sep 2026 (Project074) | Project074 | 24 | 0 | −1 | +2 | +24 | 22.2 |
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.