Re: Sound Class Transmission Rating
From: Richard L Kohlhaas (
Date: Sun, 8 Mar 2015 16:47:38 -0700 (PDT)
At Casa Verde, our duplex units are separated vertically by two 2x4 walls, with 
open space between them from attic to basement.  

Works great.  Next to us is a family with two children, one of which studied 
French horn,  and 
two dogs.  We never hear a thing.  

The design was done by Synergy Design, Matt Worswick.

Dick Kohlhaas <rlkohl [at]>
Board Member, Cohousing Association of the US
Resident of  Colorado Springs Cohousing Community at Casa Verde Commons
Completed March 2003. 34 units on 4 acres

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