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To combat a noise problem the type of frame being installed is also a factor, as some frames allow more air filtration and therefore more noise transfer.
Generally speaking, Awning or Casement Windows are far superior to Sliding or Double Hung Windows as they have inbuilt compression seals that virtually eliminate the passage of air.
Of course, it’s generally not possible to change the design of the windows unless all the windows are being replaced and the Owners agree.
In terms of the glass, double glazing is primarily designed for thermal insulation and only assists in the reduction of noise by virtue of the increased mass of glass [two panels instead on one].
A secondary window system can also be a very effective solution to noise and involves the installation of a second set of windows inside the existing, but the space between the external and internal windows must be 100mm for there to be a significant reduction in noise.
There are a number of types of Acoustic Laminated Glass that may be a better and more cost-effective solution to noise, however if you would like to increase your thermal comfort and decrease noise, then a well-sealed window incorporating double glazing of an appropriate thickness may be the best solution.
Clear Double Glazing will offer good thermal benefits in colder months, however if solar heat gain is an issue, then a double-glazed unit incorporating a Low-E Coating is a must.
As far as the type of framing material used uPVC is becoming increasingly popular, however Aluminium is still the primary material of choice.
Thermally broken Aluminium Windows are also available [at a cost] with the benefit being the reduction in heat transference through the frame, as Aluminium is a super conductor and while I would highly recommend this option is colder climates, it could be an overkill in some locations.
Replacement of windows is only an exempt development if your building has a current fire safety statement.
If you don't have a current fire safety statement you will need to submit a Development Application.
Once you lodge the Development Application council make the approval of the application conditional on necessary fire safety upgrades.
Additionally all Development Applications for work in excess of $50,000.00 will require a BASIX audit.
BASIX is the Building Sustainability Index and with respect to window replacement will look at the proposed glazing of the windows.
Some if not all of the windows will require improved glazing in order to comply with the BASIX requirements.
Improved glazing in Sydney would typically be glass with a Low E coating that will assist in the reduction of solar heat gain.