Stramit® Acoustic Panel System



  • Suits most architectural styles
  • Range of profiles available
  • Can be used vertically and horizontally
  • Manufactured from high tensile steel for high strength and low weight
  • Simple to install
  • Exceptional sound reduction performance
  • High sound absorption with NRC's in excess of 0.93
  • Tested in accordance with AS I 045 for sound absorption 


Stramit® Acoustic Panelsare suitable for applications such as school halls, gymnasiums, terminal buildings, open-sided covered walkways or wherever noise reduction is required.


Stramit® Acoustic Panels are cold roll formed cladding sheets produced from pre-perforated Colorbond materials. Steel is G550 base material (G550 MPa minimum yield stress) with a Zincalume® (AZ 150 coating, in accordance with AS 1397), plus an off white Colorbond® finish coat. Standard steel thickness is 0.42mm BMT (base material thickness). Other materials such as unpainted Zincalume®or galvanised steel, stainless steel, aluminium and copper can be roll formed subject to enquiry.


Stramit standard perforations cover approximately 11% of the cladding surface. Holes are 2.4mm in diameter and are pitched symmetrically across the sheet. This layout gives the best balance between appearance, ease of installation cladding performance and noise reduction. Should other hole patterns be required please contact your local Stramit Technical Services Manager.


Stramit has in-house purpose built testing equipment used to design, develop and improve products for the Australian market. In addition, Stramit products are tested or witnessed by independent organisations. Sound absorption tests on Stramit® Acoustic Panelshave been conducted by National Acoustic Laboratories using the reverberation chamber method in accordance with AS1045. Results of these tests are shown in the graphs on subsequent pages. Should further information be required, please contact your local Stramit Technical Services Manager.


Many internal applications for Stramit® Acoustic Panels will be relatively benign. In applications of high humidity (eg pools) or having a corrosive atmosphere contact Stramit to discuss the optimum material choice. 

Covered external applications, particularly walls, may be subject to dust, salt and other wind-blown pollutants. As these are 'unwashed' (by rainwater) areas careful choice of materials is needed. Talk to your local Stramit Technical Services Manager for advice.

Architectural Specification

A suggested specification is:

The internal wall/ceiling shall be Stramit® Acoustic Panelsin the profile. Sheeting material shall be protected steel sheet to Australian Standard AS 1397 with a minimum yield stress of 550MPa (Grade 550) and an AZ 150 zinc-aluminium coating with an Off White oven baked paint film. The sheeting shall be fixed to the structure in accordance with the manufacturers instructions. All sheeting shall be fixed in a workman like manner, leaving the job clean and with minor blemishes touched up with paint supplied by the manufacturer. All insulation/absorbing materials shall match the Stramit specification contained in the Stramit technical brochure. Please note: Not all profiles will be available from all Stramit branches. Please contact your local Stramit office for product availability.



Performance Variations

The tests described within these product pages used:

  • Stramit® Corrugated or Stramit® Longspan perforated sheet
  • Insulation Solutions Sonobatt type I glasswool insulation with a density of 32kg/m3
  • With or without a 75mm air gap between the perforated sheet and the insulation
  • Any variation to these specifications could result in a change in acoustic performance. Generally a NRC over 0.6 will give a noticeable increase in acoustic comfort, while NRC's over 0.8 are excellent
  • As a guide the following changes will affect the NRC values given in the graphs
  • Use of 75mm air gaps increase NRC by 0.02
  • Use of 75mm Sonobatt will increase NRC by 0.1
  • Stramit Monoclad® or Stramit K-Panel® Perforated Sheets will reduce NRC by 0.1
  • Use of 50mm Sonomatt (14kg/m3) reduces NRC by 0.2.

These variations are approximate only and have been determined from previous Insulation Solutions test results.

Thermal Performance

 In addition to the glasswool acoustic properties, this system also provides reasonable thermal performance. 50mm Sonobatt insulation provides a thermal resistance rating of approximately R = 1.5. Designers should be aware of this and if condensation is anticipated, adequate ventilation and/or vapour barriers should be provided to protect the acoustic panels.


Acoustic panels may be subjected to loads from impact or limited by acceptable deflection. Maximum recommended spans in millimeters for each profile are as shown in the following table. For most expected applications the panels will not be subjected to wind or foot traffic loading. However if either should be applicable refer to the profile specific Product Technical Manual for these capacities. 

Areas of Walls
Possible Impact
Areas of Walls

Acoustic Performance Graphs

The following graphs give the performance levels obtained with the absorption material (the glasswool blanket) immediately behind the acoustic panel. Improved figures are possible if the panel and glasswool blanket are separated with a 75mm air gap. Contact your Stramit Technical Services Manager for details.




Stramit® Acoustic Panelsare installed using typical cladding fixing methods. Designers need to determine the best way of holding the glasswool blankets in place (either against or 75mm away from the back of the panel) to suit the structure or method of construction concerned.

Good Practice

Stramit recommends that good trade practice be followed when installing this product, such as that found in Australian Standards Handbook HB39.


Stramit® Acoustic Panelscan be easily cut, where required, using a power saw with a steel cutting blade or a power nibble and for localised cutting, tin snips. Avoid the use of abrasive discs as these can cause burred edges and coating damage. Please dispose of any off-cuts carefully.




Prices on Stramit® Acoustic Panelscan be obtained from your nearest Stramit location or distributor of Stramit products. As Stramit does not provide an installation service, ask your tradesperson for a supply and fix price. Contact your nearest Stramit location for the names of trades persons in your area.


Stramit® Acoustic Panelsare supplied cut-to-length. When designing or transporting long products ensure that the length is within the limit of the local Transport Authority regulations. The manufacturing tolerance on the length of product supplied is +0, -15mm.


Stramit® Acoustic Panelscan be ordered directly, through distributors, or supplied and fixed from a cladding contractor.


Stramit® Acoustic Panels should be handled with care at all times to preserve the quality of the finish. Packs should always be kept dry and stored above ground level while on site. If, however, the sheets have become wet, then they
should be separated, wiped and placed in the open to promote drying.




Should it become necessary to wash Stramit® Acoustic Panelsfollow the procedure below:   

1. Wash the surface with a mild solution of pure soap or non-abrasive, non-toxic, kitchen detergent in warm water using a sponge, soft cloth or soft bristle nylon brush.   
2. Thoroughly rinse with clean water immediately after cleaning.
  WARNING - Never use abrasive or solvent type cleaners (e.g. turps, petrol, thinners or kerosene) on Colorbond®.

Further Information

Additional information on Stramit® Acoustic Panels is available from your local Stramit office including details on curved corrugated acoustic material. 

As well as the standard range of Product Technical Manuals, Installation leaflets, Case Studies and other promotional literature, Stramit has a series of Guides to aid design. 
These include:     

  • Concealed Fixed Decking
  • Roof Slope Guide
  • FootTraffic Guide
  • Roof System Selection Guide
  • Bullnosing, Curving and Crimping
  • Cyclonic Areas
  • Spring Curving Guide 

Please contact your nearest Stramit location for any of these guides or other literature.

Other Products

Stramit offers a wide range of building products including:

  • Purlins and girts
  • Formwork decking
  • Roof and wall sheeting
  • Lightweight structural sections
  • Truss components
  • Gutters and downpipes
  • Fascias
  • Custom flashings
  • Insulating products
  • Fasteners 


In preparing this document reference has been made to:     

  • Standards Australia Handbook - HB39
    (Installation code for metal roof and wall cladding)
  • BlueScope Steel - Technical Bulletin TB-4
    (Maintenance of Colorbond® prepainted steel roofing)
  • BlueScope Steel -Technical Bulletin TB-I
    (Steel roofing and walling products - selection guide).


Product Availability 


Y - Yes     N - No     S - Subject to project size