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Wall System STC 84

WALL SYSTEM STC 84
Construction Assembly
ITEM A: 200 mm steel C-Channels, 2.0 mm thick used as horizontal girths, fixed to structural columns at 300 mm vertical centres.
ITEM B: 1 layer of 16 mm plasterboard fixed to one flange of Item A
ITEM C: 92 mm Rondo steel studs, at 600 mm staggered centres, resilient rubber mounted to both faces of Item A. One set of studs is fixed through 16 mm plasterboard (Item B)
ITEM D: Both faces of 16 mm plasterboard (Item B) are sprayed with nominal 50 mm thick ENVIROSPRAY 300.
ITEM E: After adequate curing time for applied ENVIROSPRAY 300 (Item D), 3 layers of 16 mm plasterboard are fixed to both sides of 92 mm staggered studs (Item C)

  • Test Conducted at National Acoustic Laboratories – Sydney
  • Test Report No : ATF 409

Wall System STC 81

WALL SYSTEM STC 81
Construction Assembly
ITEM A: 200 mm steel C-Channels, 2.0 mm thick used as horizontal girths, fixed to structural columns at 300 mm vertical centres.
ITEM B: 1 layer of 16 mm plasterboard fixed to one flange of Item A
ITEM C: 92 mm Rondo steel studs, at 600 mm staggered centres, resilient rubber mounted to both faces of Item A. One set of studs is fixed through 16 mm plasterboard (Item B)
ITEM D: Both faces of 16 mm plasterboard (Item B) are sprayed with nominal 50 mm thick ENVIROSPRAY 300.
ITEM E: After adequate curing time for applied ENVIROSPRAY 300 (Item D), 2 layers of 16 mm plasterboard are fixed to both sides of 92 mm staggered studs (Item C)

  • Test Conducted at National Acoustic Laboratories – Sydney
  • Test Report No : ATF 408
Wall System STC 81

WALL SYSTEM – STC 77

WALL SYSTEM – STC 77
Construction Assembly
ITEM A: Masonry wall constructed from 390(L) x 90(W) x 190(H) Boral Besser blocks
ITEM B: 92 mm Rondo steel studs, at 600 mm staggered centres, resilient rubber mounted to both faces of Item A.
ITEM C: Both faces of masonry wall (Item A) are sprayed with nominal 40mm thick ENVIROSPRAY 300
ITEM D: After adequate curing time for applied ENVIROSPRAY 300 (Item C), 1 layers of jointed 13 mm plasterboard is fixed to both sides of 92 mm staggered studs (Item B)

  • Test Conducted at National Acoustic Laboratories – Sydney
  • Test Report No : ATF 236

WALL SYSTEM – STC 66

WALL SYSTEM – STC 66
Construction Assembly
ITEM A: 0.6mm BMT Colorbond metal external cladding is fixed to 28mm furring channels, themselves fixed to 200 mm C-Channels horizontal girths. Girths are spaced at 600 vertical centres.
ITEM B: Internal face of metal cladding is sprayed with nominal 100mm thick ENVIROSPRAY 300
ITEM C: Structural adequacy is provided by 360UB structural steel columns located within air space of 628mm between external cladding and internal face of Hebel block wall (Item D).
ITEM D: 150 mm thick Hebel aerated concrete wall, density 600 kg/m3, mechanically tied to steel columns (Item C)

  • Test Conducted at National Acoustic Laboratories – Sydney
  • Test Report No : E 2691
WALL SYSTEM – STC 66

WALL SYSTEM – STC 47

 WALL SYSTEM – STC 47
Construction Assembly
ITEM A: Standard 13 mm plasterboard fixed to 64 mm Rondo studs at 600 centres.
ITEM B: ENVIROSPRAY 300, density 55 kg/m3 is spray applied to the inside face of plasterboard. Services located within the wall cavity may be installed prior or after the application of ENVIROSPRAY 300. The sprayed insulation is mechanically screeded to obtain a flat flush finish for easy fixing of Item C.
ITEM C: After adequate curing time, a final 13 mm plasterboard skin is fixed to the steel studs and set / jointed for a final finish.

  • Test Conducted at National Acoustic Laboratories – Sydney
  • Test Report No : E 2691
THIS ASSEMBLY IS RATED TO FIRE RATING LEVEL 1.5 HRS (90/90/90)

To obtain a Fire Rating Level 2 Hrs (120/120/120) use 92 mm steel studs instead of 64mm, and replace 13 mm plasterboard with 16 mm plasterboard.

  • Test Conducted at CSIRO – North Ryde
  • Test Report No : FSV 0231

WALL SYSTEM – STC 36

WALL SYSTEM – STC 36
Construction Assembly

Nominal 90 mm thick ENVIROSPRAY 300, density 40 kg/m3 is spray applied to the inside face of 10 mm, set & jointed plasterboard. Steel studs are at 600mm centres.


  • Test Conducted by Curtin Consultancy – Perth
  • Test Report No : 400-093
WALL SYSTEM – STC 36

WALL SYSTEM – STC 32

WALL SYSTEM – STC 32
Construction Assembly

Nominal 100 mm thick ENVIROSPRAY 300, density 80 kg/m3 is spray applied to the inside face of 0.6 mm BMT Colorbond “Custom Orb” metal cladding or roofing. Custom Orb is screw fixed to purlins at 1200mm centres.


  • Test Conducted by National Acoustic Laboratories
  • Test Report No : ATF 686

WALL SYSTEM – STC 28

WALL SYSTEM – STC 28
Construction Assembly

Nominal 50 mm thick ENVIROSPRAY 300, density 80 kg/m3 is spray applied to the inside face of 0.6 mm BMT Colorbond “Custom Orb” metal cladding or roofing. Custom Orb is screw fixed to purlins at 1200mm centres.


  • Test Conducted by National Acoustic Laboratories
  • Test Report No : ATF 686
Rain Noise Attenuation > 17dB(A)

Rain Noise Attenuation Test Conducted by Acoustic Dynamics – Sydney

WALL SYSTEM – STC 28