SOUND TRANSMISSION LTR 2/1988 150 LINCOLN ST., BOSTON, MASSACHUSETTS 02111 617-423-5807
22 February 1988
Ms. Jessica B. Herbert, President
Loring Development Corporation
95 Federal Street '
Salem, MA 01970 = -
Subject: Sound Transmission Compliance
The Cogswell Condominium, Five School St., Salem, MA
Dear ,Jessica:
This letter concerns your lender's recent request for confirmation of the
sound transmission rating between the eight (8) residential condominium
units at The Cogswell Condominium.
There are two (2) basic demising conditions between units at The Cogswell
Condominium:
1. Between Walls:
A. At Units 1,23 & 4, the units are separated from each other and
from the egress stairway enclosure by 12" thick brick walls with
2x4 stud walls faced with 5/8" gypsum wallboard on both sides;
B. At Units 5,67 & 8, the units are separated by 2x6 stud walls
with 5/8" gypsum wallboard both sides and one layer of 1/2"
sound board ("Deciban") on one side of each demising partition,
continuous between floors.
2. Between Floors:
A. All floors are constructed of 3x 14 timbers at close centers (16"
typical) with 3/4" wood subfloor and 3/4" wood finish flooring,
over which has typically been applied an additional layer of
underlayment, pad and carpet.
B. In some areas, of dropped ceilings, there is additional 2x6
framing and a 5/8" layer of gypsum ceiling board.
The project has been designed and constructed in accordance with the
Massachusetts State Building Code (Fourth Edition). Linder Section 522.0, it
provides for sound transmission control in residential buildings, requiring an
(Continued)
Loring Development Corporation
22 February 1988, Page Two
STC Rating of 45 for airborne and structureborne noise between units.
In my professional opinion, as Architect of Record for the project, the sound
transmission abatement provisions made at The Cogswell Condominium meet
or exceed the Code requirements. I do not anticipate any complaints from
unit owners with regard to this matter and expect that they will experience
the quiet enjoyment of their units which is the intent of the Code.
Very truly yours,
T
Rogetered
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XC: Mr. Steven Gauthier, Licensed Builder
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VIA EXPRESS MAIL
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