| Acoustical Performance of Glass and Wall Constructions |
|---|
 | Overall
Thickness |
Inside | Construction
Space | Outside | STC
Value | ISO
RW 3 |
|---|
Single
Laminated
Glass 1 |
1/4" (7.24 mm) | 1/8" | 0.030 P.V.B. | 1/8" | 35 | 35 |
|---|
| 3/8" (9.53 mm) | 1/4" | 0.030 P.V.B. | 1/8" | 36 | 36 |
| 3/8" (10.5 mm) | 1/4" | 0.060 P.V.B. | 1/8" | 37 | 37 |
| 1/2" (12.1 mm) | 1/4" | 0.030 P.V.B. | 1/4" | 38 | 38 |
| 1/2" (12.9 mm) | 1/4" | 0.060 P.V.B. | 1/4" | 39 | 39 |
| 5/8" (16.2 mm) | 3/8" | 0.030 P.V.B. | 1/4" | 40 | 40 |
| 3/4" (19.9 mm) | 1/2" | 0.060 P.V.B. | 1/4" | 41 | 41 |
Laminated-
Insulating
Glass 2 |
1" (26.1 mm) | 1/4" laminate | 1/2", Air | 1/4" | 39 | 39 |
|---|
| 15/16" (24.6 mm) | 1/4" laminate | 1/2", Air | 3/16" | 39 | 39 |
| 1-1/8" (29.3 mm) | 3/8" laminate | 1/2", Air | 1/4" | 40 | 40 |
| 1-7/16" (37.3 mm) | 1/4" laminate | 1", Air | 3/16" | 42 | 42 |
| 2-7/16" (62.7 mm) | 1/4" laminate | 2", Air | 3/16" | 45 | 45 |
| 4-1/2" (113.5 mm) | 1/4" laminate | 4", Air | 3/16" | 48 | 48 |
| 4-5/8" (119.1 mm) | 1/2" laminate | 4", Air | 3/16" | 49 | 49 |
| 1" (27.9 mm) | 1/4" laminate | 1/2", Air | 1/4" laminate | 42 | 42 |
| 4-3/4" (120.7 mm) | 1/2" laminate | 4", Air | 1/4" laminate | 51 | 51 |
Airspaced
Glass 1 |
1/2" (14.5 mm) | 1/8" | 1/4", Air | 1/8" | 28 | 30 4 |
|---|
| 1" (27.9 mm) | 1/4" | 1/2", Air | 1/4" | 35 | 35 |
| 11/2" (40.6 mm) | 1/4" | 1", Air | 1/4" | 37 | 37 |
Monolithic
Glass 1 |
1/4" (5.59 mm) | 1/4" | - | - | 31 | 32 5 |
|---|
| 1/2" (12.4 mm) | 1/2" | - | - | 36 | 37 6 |
| Walls 1 |
1/2" Gypsum board (both sides) screwed to 3-5/8" metal studs | 36 | 36 |
|---|
| 4" Face brick, mortared together | 45 | 45 |
| 6" Lightweight concrete block, two coats of paint each side | 46 | 46 |
| 4" Hollow lightweight masonry block, plastered on both side | 48 | 48 |
| 8" Dense concrete block wall, two coats of paint each side | 52 | 52 |
| Double layer of gypsum wall board, both sides, 3-5/8" metal studs, 3" sound attenuation blanket |
54 | 54 |
1 Tested under ASTM E90, panels caulked in place with wooden stops and glazing putty.
2 Tested under ASTM E90, laminated outside pane consisted of either 1/8"-0.030" P.V.B. -1/8" (total 1/4" thick), 1/4"-0.030" P.V.B. -1/8" (total 3/8" thick), 1/4"-0.030" P.V.B. -1/4" (total 1/2" thick), 1/4"-0.030" P.V.B. -1/2" (total 3/4" thick), panels caulked in place in single frame with wooden stops and glazing putty. Units with less than 1" airspace were factory sealed. All other units were constructed in place.
3 Weighted Sound Reduction Index (Rw) in accordance with ISO 717/3
4 Deviates below Rw 30 contour by 10 dB at 400 Hz
5 Deviates below Rw 32 contour by 9 dB at 2,500 Hz
6 Deviates below Rw 37 contour by 9 dB at 1,200 Hz
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