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Window Sound Transmission Class Ratings

S.T.C rating
Sound
Transmission
rating
Higher rating is better

Pricing on
36" X   54"
with Basic installation

Glass
thickness
Inside
light
Glass
thickness
Outside lite Low-E lite

U-values
go up as
glass thickness increases

18-20      Old single pane window N/A 3/32-3/16 N/A 1.30 U-factor

27          Standard low-E
          insulated double pane glass

$ 395. Without additional sound reduction. Still reduces sound by almost 1/2 over single pane glass!

3/32 3/32 .30 U-factor
3D Max
29           1/8 upgrade insulated                                  double pane glass $ 410. 1/8 1/8 .30 U-factor
31 $ 456. 3/16 3/16 .29. U-factor
33             Best Value $ 450. 3/16 1/8

Altering glass thickness
helps break up sound waves.
.30 U-factor

not yet rated $ 550. 1/8 1/4  
not yet rated $ 437. 1/4 1/8  
33 $ 562. 7/32 laminated 1/4  
35 $ 617. 7/32 laminated 3/16  
not rated $ 736. 7/32 laminated 1/4  
35 $ 726. 7/32 laminated 7/32 laminated  
Milgard Quite Line Window
Tripple pane ( Double Hung )
pricing on
36" X 54" ( Double Hung )
with Basic installation
Glass
thickness
inside
light
Glass
thickness
Outside lite
Low-E lite


Glass
thickness
Middle
lite

 

41 $ 880. 1/8 1/8 1/8   .20 U-factor
44 $ 895. 1/8 3/16 1/8
45 $ 1026. 1/8 7/32 laminated 1/8
45 $ 921. 3/16 1/8 1/8
46 $ 1161. 7/32 laminated 7/32 laminated 1/8