S.T.C.ratings

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