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�. �. <br /> Pir. Larry L. Bramhall , President <br /> August 6, 1979 <br /> Page Two <br /> , <br /> 7he eonsCruction dra�•rings for the referenced apartments indicate typical <br /> wood frame ccostruction, except that windo�,is are ir;sulated glass <br /> (3/16"-:l/4"-3/16") . Because insulated glass prro vides somewhat better nuise � <br /> attenuation than a single thickness of 3/16" glass, we feel certain the <br /> pr•oposed construction ��iill meet the 20 dBA noise reduction requirement. This, <br /> of course, assumes that the windows are closed and tigfitly sealed. (The <br /> windows, even when closed, are the primary noise transinission path from <br /> outside to inside.; <br /> If you have any questions regarding this evaluation, please contact us. <br /> Sincerely yours, <br /> TOldNE, RICHARDS & CHAUDIERE, iIV <br /> � ���� <br /> � <br /> Ray L. Ricftards <br /> Vice-President <br /> RLR/js <br />