Environmental Engineering Reference
In-Depth Information
6.2.9 Acoustical Control
6.2.9.1 Exterior Sound
Wall
and roof-ceiling assemblies that are part of the
building envelope
shall
have a composite outdoor-indoor transmission class (OITC) rating of 40 or
greater or a composite sound transmission class (STC) rating of 50 or greater,
and
fenestration
that is part of the
building envelope
shall have an OITC or STC
rating of 30 or greater for any of the following conditions:
1. Buildings within 300 m of
expressways
2. Buildings within 8 km of airports serving more than 10,000 com-
mercial jets per year
3. Where
yearly average day-night average sound levels
at the property line
exceed 65 decibels
Exceptions to that are buildings that may have to adhere to functional and
operational requirements such as factories, stadiums, storage, enclosed park-
ing structures and utility buildings.
6.2.9.2 Interior Sound
Interior
wall
and floor/ceiling assemblies separating interior rooms and
spaces shall be designed in accordance with all of the following:
1.
Wall
and floor-ceiling assemblies separating adjacent
dwelling units
,
dwelling units
and public spaces, adjacent tenant spaces, tenant spaces
and public places, and adjacent
classrooms
shall have a composite
STC rating of 50 or greater.
2.
Wall
and floor-ceiling assemblies separating hotel rooms, motel
rooms and patient rooms in nursing homes and hospitals shall have
a composite STC rating of 45 or greater.
3.
Wall
and floor-ceiling assemblies separating
classrooms
from rest
rooms and showers shall have a composite STC rating of 53 or
greater.
4.
Wall
and floor-ceiling assemblies separating
classrooms
from music
rooms, mechanical rooms, cafeteria, gymnasiums and indoor swim-
ming pools shall have a composite STC rating of 60 or greater.
6.2.9.3 OITC and STC
OITC values for assemblies and components shall be determined in accor-
dance with ASTM E1332. STC values for assemblies and components shall
be determined in accordance with ASTM E90 and ASTM E413.
