Super Soundproofing Community Forum

Soundproofing Forum Topics => Soundproofing Windows and Doors => Topic started by: Slin on August 22, 2018, 03:21:34 PM

Title: Bedroom window facing train tracks
Post by: Slin on August 22, 2018, 03:21:34 PM
Hello, Randy,
My bedroom window is quite large and it is facing train tracks.  When the train passes it register 67
Decibel inside using iPhone decible meter.  I need to reduce it down to 40’s. 
I already have my wall “floated” on isolation clips, hat channels, and quietrock plus batt.
The window is 58” by 45” Milguard double pane slider.
I have at least 3.5” air space between exterior Milguard and second new window.
City does not like second window because it reduces egress. 
It is a rental property and I am obligated to make it “quiet”.  Shall I go against the City and install a secondary glaze or buy an Quietline?

Title: Re: Bedroom window facing train tracks
Post by: Randy S on August 23, 2018, 03:28:19 PM
Slin,

67dba down to 40's is quite a bit of reduction through a window... you might have to do both to get that value.

If you do the 3/8" acrylic insert on a magnetic system you can get around 10db reduction.

I can not tell you to go against the city but if you have to get into the 40's I do not see any option besides doing the quietline and the second insert..not going to be cheap and no guarantees. If you already have a Tuscany series window you might only see 5-6 db in additional reduction.

I would have to say that the city must understand the difficulty level here based on the source.

Randy S.