Style No.

Section / Construction

Noise Transmission Levels

Typical 1/2" Type X Gypsum Board

STC 5/8" Type X Gypsum Board

8

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

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

54

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
• 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

9

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

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

60

62

• 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
• resilient metal channels on one side spaced 16" or 24" o.c
• 2 layers of gypsum board on both sides

10

57

57

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

11

50

50

• 2 X 3 non-load bearing steel studs spaced at 24" o.c.
• 2-1/2" thick absorptive material
• 2 layers of gypsum board on one side
• 1 layer of gypsum board on one side

12

51

53

• 2 X 4 non-load bearing steel studs spaced at 24" o.c.
• 2-1/2" thick absorptive material
• 2 layers of gypsum board on one side
• 1 layer of gypsum board on one side

13

54

55

• 2 X 6 non-load bearing steel studs spaced at 24" o.c.
• 2-1/2" thick absorptive material
• 2 layers of gypsum board on one side
• 1 layer of gypsum board on one side