Style No.

Section / Construction

Noise Transmission Levels

Typical 1/2" Type X Gypsum Board

STC 5/8" Type X Gypsum Board

1

34

36

• 2 X 4" studs spaced at 16" or 24" o.c.
• 3-1/2" thick absorptive material
• layer of gypsum board on both sides

2

38

38

• 2 X 4" studs spaced at 16" or 24" o.c.
• 3-1/2" thick absorptive material
• 2 layers of gypsum board on both sides

3

43

48

• 2 X 4" studs spaced at 24" o.c.
• 3-1/2" thick absorptive material
• resilient metal channels on one side spaced 16" or 24" o.c.
• 1 layer of gypsum board on both sides

4

53

54

• 2 X 4" studs spaced at 24" o.c.
• 3-1/2" thick absorptive material
• resilient metal channels on one side spaced 16" or 24" o.c.
• 1 layer of gypsum board on resilient metal channel side.
• 2 layers of gypsum board on other side

5

1 - layer of 3-1/2" absorptive material on one side

2 - layers of 2-1/2" absorptive material on both sides

45

47

• 2 rows of staggered studs spaced at 16" or 24" o.c. on a common 2 X 6" plate
• 3-1/2" thick absorptive material on one side or 2-1/2" thick material on both sides
• 1 layer of gypsum board on both sides

6

1 - layer of 3-1/2" absorptive material on one side

2 - layers of 2-1/2" absorptive material on both sides

50

52

• 2 rows of staggered studs spaced at 16" or 24" o.c. on a common 2 X 6" plate
• 3-1/2" thick absorptive material on one side or 2-1/2" thick material on both sides
• 1 layer of gypsum board on one side
• 2 layers of gypsum board on other side

7

1 - layer of 3-1/2" absorptive material on one side

2 - layers of 2-1/2" absorptive material on both sides

55

56

• 2 rows of staggered studs spaced at 16" or 24" o.c. on a common 2 X 6" plate
• 3-1/2" thick absorptive material on one side or 2-1/2" thick material on both sides
• 2 layers of gypsum board on both sides