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r <br /> . � �..,. <br /> hir. Larry L. Bramliall , President ' <br /> August 6, 1979 <br /> Page Two , <br /> The construction drawin9s for the referenced apartments indicate typical <br /> wood frame construction, except that windows are insulated glass <br /> (3/16"-1/4"-3/16"). Beca�se insulated glass provides somewhat better noise <br /> attenuation than a single thickness of 3/16" glass, we feel certain the <br /> proposed construction will meet tlie 20 d4A noise reduction requirement. This, <br /> of course, assumes that the windows are closed and tightly sealed. (The <br /> windows, even wlien closed, are tfi^ primary noise transmission path from <br /> outside to inside.) <br /> If you have any questions regarding this evaluation, please contact us. <br /> Sincerely yours, <br /> TOWNE, RICHARDS & CHAUD[ERE, IN . <br /> � ��� � <br /> �'� <br /> Roy L. Richards <br /> Vice-President <br /> RLF/is <br /> � <br />