Plasterboard, Glass Wool 100 mm R5, No MLV
Same material, insulation and MLV, perforation geometry varied.
Tests
5
Effect of Hole Shape
Rw range
12–18dB
spread 6 dB
Highest Rw
18dB
PB Slots (13.1%)
Largest ΔRw vs first
+4dB
PB Slots (13.1%)
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 | |
|---|---|---|---|---|---|---|---|---|
| PB 6 mm Round (No Scrim) (10.4%) | Project005 | 12 | −1 | −3 | ref. | +11 | 10.3 | |
| PB 12 mm Round (17.7%) | Project023 | 17 | −1 | −2 | +3 | +16 | 14.7 | |
| PB 15 mm Round (19.6%) | Project017 | 16 | −1 | −2 | +2 | +15 | 13.8 | |
| PB 12 mm Hexagon (23.9%) | Project034 | 17 | −1 | −2 | +3 | +16 | 14.9 | |
| PB Slots (13.1%) | Project028 | 18 | −1 | −3 | +4 | +17 | 15.6 |
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.