Global Media Education - SAE Institute
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 |
  |
|
| 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.
|
No Insulation
|
With Insulation
|
 |
|
2 layers of 16mm (5/8") plasterboard each side of a steel stud.
|
No Insulation
|
With Insulation
|
 |
|
3 layers of 16mm (5/8") plasterboard each side of a steel stud.
|
No Insulation
|
With Insulation
|
 |
|
1 layer of 16mm (5/8") plasterboard each side of a staggered steel stud. |
No Insulation
|
With Insulation
|
 |
| 2 layers of 16mm (5/8") plasterboard each side of a staggered steel stud. |
No Insulation
|
With Insulation
|
 |
| 3 layers of 16mm (5/8") plasterboard each side of a staggered steel stud. |
No Insulation
|
With Insulation
|
 |
| 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 | |||
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1 x Layer of 16mm (5/8") Plasterboard fixed to a flexible channel fixed at 400mm (16") centres. (a) 45 (b) 49 (c) 45 |
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2 x Layers of 16mm (5/8") Plasterboard fixed to a flexible channel fixed at 400mm (16") centres. (a) 56 (b) 58 (c) 55 |
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3 x Layers of 16mm (5/8") Plasterboard fixed to a flexible channel fixed at 400mm (16") centres. (a) 56 (b) 59 (c) 55 |
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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. | ||