STC CHART
In the following charts all plasterboard joins and edges are sealed with an appropriate acoustic sealant. The figures given below are based on all surfaces being sealed to airtight.
TIMBER STUD
STC RATING
 
Standard stud wall with one layer of 16mm (5/8") Plasterboard

No Insulation 28

Typical wall construction with 1 layer of 16mm(5/8") Plasterboard on each side of 95x35mm (4 x 11/2") timber studs.

No Insulation 35

With Insulation 38

Typical wall construction with 2 layers of 16mm(5/8") Plasterboard on each side of 95x35mm (4 x 11/2") timber studs.

No Insulation 41

With Insulation 45

The Flexible Channel

Single 95x35mm (4"x2")Stud wall with 1 layer of 16mm (5/8") Plaster board on one side and 1 layer of 16mm on the other side on a horizontal flexible channel at 600mm (2ft) centres screwed to the stud.

No Insulation 40

With Insulation 47

This is how a rondo channel connects to a timber frame and the plasterboard connects to the rondo channel

Staggered stud wall construction with 1 layer of 16mm(5/8") Plasterboard on studs of 95x35mm (4 x 11/2") on a 120mm (4 3/4")common base.

No Insulation 42

With Insulation 48

Staggered stud wall construction with 2 layers of 16mm(5/8") Plasterboard on studs of 95x35mm (4 x 11/2") on a 120mm (4 3/4")common base.

No Insulation 50

With Insulation 54

Staggered stud wall construction with 3 layers of 16mm(5/8") Plasterboard on studs of 95x35mm (4 x 11/2") on a 120mm (4 3/4")common base.

No Insulation 56

With Insulation 61

BRICK VENEER
The typical Brick Veneer construction with a layer of 10mm (3/8") plasterboard. This is the standard Australian house construction.

 

No Insulation 53

With Insulation 55

Brick Veneer construction with a layer of 16mm (5/8") plasterboard.

No Insulation 54

With Insulation 56

STEEL STUD

1 layer of 16mm (5/8") plasterboard each side of a steel stud.
Stud sizes

  • 51mm
  • 64mm
  • 76mm
  • 92mm
  • 150mm

No Insulation

  • 37
  • 38
  • 39
  • -
  • 42

With Insulation

  • 42
  • 42
  • 43
  • 46
  • 46

2 layers of 16mm (5/8") plasterboard each side of a steel stud.
Stud sizes

  • 51mm
  • 64mm
  • 76mm
  • 92mm
  • 150mm.

No Insulation

  • 46
  • 46
  • 48
  • 48
  • 51

With Insulation

  • 51
  • 52
  • 53
  • 53
  • 55

3 layers of 16mm (5/8") plasterboard each side of a steel stud.
Stud sizes

  • 51mm
  • 64mm
  • 76mm
  • 92mm
  • 150mm.

No Insulation

  • 50
  • 51
  • 52
  • 53
  • 55

With Insulation

  • 54
  • 55
  • 56
  • 57
  • 58

1 layer of 16mm (5/8") plasterboard each side of a staggered steel stud.

No Insulation

  • 41

With Insulation

  • 47
2 layers of 16mm (5/8") plasterboard each side of a staggered steel stud.

No Insulation

  • 52

With Insulation

  • 58
3 layers of 16mm (5/8") plasterboard each side of a staggered steel stud.

No Insulation

  • 55

With Insulation

  • 60
Double steel studs opposite each other with 2 layers of 16mm (5/8") plaster board on each side.(Insulation is 125mm (5") glass wool 25kg/m2)

No Insulation 55

With Insulation 59

Single 150mm (6") Steel stud with 3 layers of 13mm (1/2") plasterboard on one side and on the other side another 3 layers on a flexible channel screwed horizontally onto the steel stud. (Insulation is 125mm (5") glass wool 25kg/m2)

No Insulation 55

With Insulation 64

BRICK and CONCRETE BLOCK
Standard house brick unrendered.
39
House brick rendered both sides (13mm (1/2") 1:1:6,Cement:Lime:Sand)
45
8" Concrete Block, hollow core, no wall finish
45
8" Concrete Block , hollow core, painted 2 coats, 2 sides
48
CEILINGS

1 x Layer of 16mm (5/8") Plasterboard fixed to a flexible channel fixed at 400mm (16") centres.

(a) 45

(b) 49

(c) 45

2 x Layers of 16mm (5/8") Plasterboard fixed to a flexible channel fixed at 400mm (16") centres.

(a) 56

(b) 58

(c) 55

3 x Layers of 16mm (5/8") Plasterboard fixed to a flexible channel fixed at 400mm (16") centres.

(a) 56

(b) 59

(c) 55

   
Go to Boral's plasterboard web site
I am indebted to the people at Boral for their excellent web page and the TecSYS CDROM they sent me free for the figures presented above for plasterboard installations.