DG-1110-3-119
Design Guide: Band Training Facilities
March 1983
Practical Approaches for Accoustic Construction
This discussion presents approaches and details for sound-
A. Individual Practice Rooms
isolating construction in the form of discussions of spe-
Individual Practice Rooms, from 65 to 125 square feet
cific room types. But the methods described for a specific
in area, may have background noise up to NC-35 (see Para-
space are applicable generally to isolation problems of
graph 3-5.A), yet sound produced in the rooms may reach
similar scope. Throughout this discussion, refer to Table
90dB. Thus, by first approximation, the barrier between adja-
5-1, which indicates the performance that can be expected
cent practice rooms should reduce the sound by at least
of well-sealed barriers of the respective types. Also see
55 dB, or should be rated STC 55. This does not guaran-
Tables 5-2 and 5-3, which suggest constructions adequate
tee inaudibility, which would require an "overdesign" by
for different room types and combinations of materials, dis-
10 to 15 dB, but it does represent a reasonable goal.
cussed in detail below.
Table 5-1 Typical Performance Ranges of Sound Isolating Constructions
STC*
Floor-Ceiling** Constructions:
Wood joist floors without ceiling
20-30
Same with rigidly attached ceiling
30-40
45-55
Same with resiliently attached ceiling
Concrete slabs/decks without ceiling
35-55
Same with suspended ceiling
50-65
Double (floated) concrete slabs
55-70
Double concrete slabs with suspended ceiling
65-80
Wall Constructions:
30-40
Simple stud walls, with gypsum wallboard
45-55
Double stud walls, with gypsum wallboard
30-45
Demountable partitions, with gypsum wallboard
35-55
Simple masonry walls
Same with resiliently furred skins of gypsum wallboard
50-65
Double (tieless) masonry walls
60-75
Doors and Windows:
10
Hollow core door and wood frame
15-25
Solid core or hollow metal ungasketed doors
Fully gasketed (acoustical) doors
30-50
Tandem doors in common wall
35-55
Tandem doors in sound lock
40-70
Typical single glazing or thermal double glazing
25-35
Special laminated acoustical glazing
35-45
Well-separated double glazing
40-55
*Note the limits of Sound Transmission Class (STC) measurements as a guide to performance in
band facilities, as discussed in 3-5.A. See discussion of specific room types in this chapter for
recommended STC levels.
* *All ceilings solid plaster or gypsum board; not acoustic tile which is inherently porous.
5-2
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