Glass STC Comparison Guide
Analyses of acoustic problems involve measuring the level and frequency of all the noise components and determining their modification by the glazing at all frequencies, in order to derive a residual transmitted spectrum. This may then be judged against notional targets or criteria. These procedures are time consuming and may involve expertise.
| Glass Type & Thickness |
STC
Rating |
||
| 3mm Float 1/8" Float |
23.5db
|
15%
|
26
|
| 4mm Float 3/32" Float |
23.5db
|
15%
|
26
|
| 5mm Float 3/16" Float |
23.5db
|
15%
|
29
|
| 6mm Float 1/4" Float |
26.5db
|
15%
|
29
|
| 8mm Float 5/16" Float |
28.8db
|
15%
|
29
|
| 10mm Float 3/8" Float |
29.7db
|
20%
|
30
|
| 12mm Float 1/2" Float |
31.5db
|
29%
|
33
|
| 15mm Float 5/8" Float |
34.5db
|
42%
|
30
|
| 19mm Float 3/4" Float |
34.6db
|
43%
|
33
|
| 22mm Float 7/8" Float |
35.4db
|
46%
|
32
|
| 25mm Float 1" Float |
35.4db
|
46%
|
32
|
| Nominal Glass Thickness |
IG Unit Make-up
|
STC
Rating |
|
| 25mm IGU 1" IGU |
6mm G + 12mm AS + 6mm G
1/4" G + 1/2" AS + 1/4" G |
32
|
|
| 27mm IGU 1 1/16" IGU |
6mm G + 12mm AS + 3-1.52-3mm LG
1/4" G + 1/2" AS + 1/8-.060-1/8" LG |
35
|
|
| 30mm IGU 1 3/16" IGU |
6mm G + 12mm AS + 5-1.52-5mm LG
1/4" G + 1/2" AS + 3/16-.060-3/16" LG |
37
|
|
| 33mm IGU 1 5/16" IGU |
6mm G + 12mm AS + 6-1.52-6mm LG
1/4" G + 1/2" AS + 1/4-.060-1/4" LG |
38
|
|
| Nominal Glass Thickness |
Laminated Glass Make-up
|
STC
Rating |
|
| 6.76mm LG 1/4" LG |
3mm G + 0.76mm PVB + 3mm G
1/8" G + .030" PVB + 1/8" G |
34-36
|
|
| 7.14mm LG 1/4" LG |
3mm G + 1.14mm PVB + 3mm G
1/8" G + .045" PVB + 1/8" G |
36
|
|
| 7.52mm LG 1/4" LG |
3mm G + 1.52mm PVB + 3mm G
1/8" G + .060" PVB + 1/8" G |
34
|
|
| 9.76mm LG 3/8" LG |
3mm G + 0.76mm PVB + 6mm G
1/8" G + .030" PVB + 1/4" G |
36
|
|
| 12.76mm LG 1/2" LG |
6mm G + 0.76mm PVB + 6mm G
1/4" G + .030" PVB + 1/4" G |
37-39
|
|
| 13.14mm LG 1/2" LG |
6mm G + 1.14mm PVB + 6mm G
1/4" G + .045" PVB + 1/4" G |
37-39
|
|
| 13.52mm LG 1/2" LG |
6mm G + 1.52mm PVB + 6mm G
1/4" G + .060" PVB + 1/4" G |
38
|
|
| 16.76mm LG 5/8" LG |
6mm G + 0.76mm PVB + 10mm G
1/4" G + .030" PVB + 3/8" G |
38
|
|
MEAN SOUND INSULATION r
values of the measured sound insulation of the glazing. Because of the slight difference between the British Standard and American Standard frequency ranges (namely a shift upwards by a third octave in American data compared with British) there may be a small discrepancy in their comparison. Typically, the American Rm is I dB higher than the corresponding British Rm derived from the same data.
mm
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