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Sound control is most efficient when two or more methods are used together. There are many possible combinations of these six techniques. How does one choose which to use?
The table below lists typical STC values for a variety of construction types. It also shows the improvement in noise reduction provided by the different sound control options, using as a baseline the most basic wall construction of studs and drywall with no caulking. Notice that a wall with an STC value of 50 ( studs, drywall, resilient channels, sound control insulation ) provides four times more sound reduction than the basic wall with an STC value of 30.
Type of Construction
STC Value
Improvement
Studs/ Drywall/ No Caulking
30 (MAX)
1 (baseline)
All remaining Types include Caulking
Studs- Drywall
35
1.42
Studs- Double Drywall One Side
37
1.63
Studs- Drywall-Sound Control Insulation
39
1.87
Studs- Double Drywall One Side - SC Insulation
41
2.15
Studs- Drywall- Resilient Channels
42
2.3
Studs- Double Drywall One Side -Resilient Channels
45
2.84
Studs- Drywall- Resilient Channels -SC Insulation
50
4.0
Staggered Studs- Drywall- SC Insulation
51
4.3
Studs-Double Drywall 1side-Res Channel-SC Insul.
52
4.6
Staggered Studs-Double Drywall 1Side-SC Insul.
53
4.94
Double Wall- Double Sound Control Insulation
59
7.46
Remember that STC values are based on the number of decibels of transmitted sound reduced by the wall. Just as a 50 dB sound is four times louder than a 30 dB sound, a 50 STC wall is four times quieter than a 30 STC wall.
Using the values shown in this table and factoring in costs and construction time, three sound control combinations stand out as the most logical choices:
1) Studs, drywall, caulking, sound control insulation;
