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Sound Transmission Class


Definition

STC is expressed in decibels (dB) and is used to measure a building material's ability to reduce sound. A higher STC rating translates into more reduction in sound. Laboratory testing is used to measure the resistance of partitions such as walls, windows, or doors to the passage of sound.

The material with the lowest resistance to the passage of sound limits a partition's STC value. Poor construction practices can also nullify a partition's sound reduction properties. Cracks due to improperly fitted doors or windows can be a prime source of sound leakage.


STC values

Western Reflections conducted third party IAS-accredited lab testing on a range of 22" x 64" doorglass configurations. These sound transmission loss tests were conducted in accordance with ASTM E 90. The Sound Transmission Class (STC) rating was calculated in accordance with ASTM E 413. Test results and benchmark values are presented below.


Western Reflections Craftsman door glass

Family Configuration STC Comment Date tested Test report expiration
Decorative Decorative glass
with caming
31 Third party tested
(692 K) Adobe PDF
4/6/11 4/6/15
1-lights,
grilles
between
glass,
external
grilles
1/2" IG, clear glass 1-light,
1/4" air space, intercept spacer
27 Third party tested
(692 K) Adobe PDF
4/6/11 4/6/15
1/2" IG, clear glass, external grille,
1/4" air space, intercept spacer
27 Third party tested
(774 K) Adobe PDF
8/29/11 8/29/15
1" IG, clear glass 1-light,
3/4" air space, intercept spacer
28 Third party tested
(692 K) Adobe PDF
4/6/11 4/6/15
1" IG, clear glass, grilles between glass,
3/4" air space, intercept spacer
29 Third party tested
(774 K) Adobe PDF
8/29/11 8/29/15
Simulated divided light,
grilles between glass with external grilles,
3/4" air space, intercept spacer
30 Third party tested
(774 K) Adobe PDF
8/29/11 8/29/15
Severe
weather
Severe weather,
1-light door glass
37 Third party tested
(692 K) Adobe PDF
4/6/11 4/6/15
Severe weather,
decorative door glass
38 Third party tested
(692 K) Adobe PDF
4/6/11 4/6/15
Blinds Grilles between glass blind,
with box alum spacers,
slats lowered and closed
36 Third party tested
(774 K) Adobe PDF
8/29/11 8/29/15
Abel patio door blind,
box aluminum spacer,
slats lowered and closed
32 Third party tested
(774 K) Adobe PDF
8/29/11 8/29/15
Door and
window
reference
information
3' x 7' steel door,
1-3/4" thick with polyurethane core
26 From HUD Noise
Notebook*
30" x 48" aluminum clad casement window,
1" IG with 1/8" panels
29 From HUD Noise
Notebook*
* Source: HUD Noise Notebook chapter 4 supplement, Sound Transmission Class guidance


 
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