Plasterboard 12 mm Round, No Insulation, No MLV
The same perforated board with and without its scrim backing.
Tests
2
Effect of Scrim
Rw range
3–7dB
spread 4 dB
Highest Rw
7dB
Scrim
Largest ΔRw vs first
+4dB
Scrim
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 | |
|---|---|---|---|---|---|---|---|---|
| No Scrim | Project072 | 3 | 0 | 0 | ref. | +3 | 3.0 | |
| Scrim | Project003 | 7 | 0 | 0 | +4 | +7 | 8.3 |
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.