The Science of Sound Reduction Made Easy
Noise levels are measured as sound
pressure levels, expressed as decibels (dB) 0 dB being the lowest threshold of
human hearing up to 140dB resulting in inner ear damage and pain.
exposure at 90 dB (a heavy truck at 40km/h at a distance of 7m) or above is hazardous
to human hearing.
The internationally used rating of Sound Transmission
Class (STC) is used to evaluate the acoustical integrity of various building elements
such as windows, doors, walls, floors and ceilings.
The STC rating of some
of the most common building elements are detailed below
270mm thick double-skin (cavity) brick wall
Conventional brick veneer
Pitched roof clad with tiles over 10mm plasterboard
glass in a typical non acoustic window
hollow core door
You can now see that the weakest
acoustic link in a typical building is the windows and doors.
of the Sound Barrier System inside existing noise-affected windows and doors the
STC rating will increase to STC 42-44 (dependant on configuration and glass thickness)
resulting in the windows/doors performing at an equal or better STC rating than
the walls. In most cases completely solving your noise problem.
A 10 dB(A)
improvement in the STC rating equates to halving the perceived noise level. Therefore,
installation of Sound Barrier windows and doors inside your existing windows and
doors will provide an improvement from STC 20 to STC 42-44. Or, in other words,
better than halving and halving again current noise transmission through the window
or door opening. NOISE REDUCTION OF GREATER THAN 75%.
and doors ranging from STC 30 to STC 50+ are also available. Please contact us
to discuss your specific requirements.
Here are a selection of our CSIRO test results:
- CSIRO Test Result - Doors(click here)
- CSIRO Test Result - Windows(click here)