Knowledge Centre

To describe the performance of glass, it is important to understand the following attributes.

  • Visible light transmittance - the percentage of visible light transmitted through the glass. The higher the number, the more light. It does not determine the colour of the glass.
  • SHGC (solar heat gain coefficient) – the proportion of directly transmitted and absorbed solar energy that enters into the building’s interior. The lower the number, the better solar control. For example, if the direct solar energy on a hot day is 785 watts/m2 and Viridian SuperGreen™ was used with a SHGC of 0.51, then the solar energy reaching indoors is 785 x 0.51 = 400 watts. Approximately half of the sun’s heat is eliminated.
  • U Value – this is the measurement of air-to-air thermal conductance, or insulation between indoors and outdoors, through the glass. The lower the number, the better the insulation. For example, clear glass has a U Value of 5.8 W/m2 °C. If the indoor temperature was 24°C and the external temperature 34°C (a difference of 10°C) then 10°C multiplied by the U Value 5.8 equals 58 watts/m2 of heat that would be transferred between the exterior and interior.

Source: Viridian

What is Low-Emissivity?

Emissivity measures the rate a product emits absorbed heat. The lower the number, the more efficiently the glass reduces heat gain or heat loss, which means a lower U Value and better insulation. For comparison, normal glass has an emissivity of 0.84 and EnergyTech and SolTech is 0.17, which means only 17% of heat absorbed is re-emitted. Likewise, if a solar control glass is used, it acts as a barrier to the absorbed heat in the glass, passing to inside the building. For buildings that require passive heat gains, it allows direct solar radiation to pass through the glass and then traps it inside. So in combination with the correct selection of solar control or thermal insulation glass, EnergyTech and SolTech reduce energy use.

Low E glass

These glasses enhance insulation, and provide additional solar control when combined with a solar control glass, in either a single glass, a laminate, and/or an insulating glass unit. Low E glass has either a pyrolitic or Airco coating that reduces the emissivity of the glass surface. This means the glass provides greater insulation by reflecting heat. For improved solar control it is also a second line of defence. Heat absorbed by the solar control glass is reflected back out by the Low-Emissivity coating to provide even better solar control. Low E coatings are useful for reducing solar heat gains and also heat loss.

Source: Viridian

The following glass types can be used to control noise:

  • Thick glass – the greater the thickness the better the noise reduction for low frequencies such as traffic noise. However, standard glass has a coincidence dip when the glass vibrates at the same frequency as the noise source. This is dependent on glass thickness but generally occurs at higher frequencies.
  • Laminated glass – the interlayer is particularly effective at dampening which provides superior sound reduction over the same thickness monolithic glass. Further, the dampening effect of laminated glass reduces the coincidence dip at these higher frequencies and therefore is a solution for aircraft and voice noise.
  • Double glazing – standard insulating glass units do not provide good noise reduction. For insulating glass units to be effective, an air gap of 50mm to 100mm needs to be provided. However, the incorporation of one or two panels of laminated glass, a glass of differing thickness or VLam Hush into the unit provides excellent results.

The National Construction Code of Australia basic balustrade fall height requirement is as follows:

“Any access way or landing area where there is a fall distance of 1 metre or more above the surrounding ground level requires a barrier (Balustrading) to protect people from falling over the edge. The minimum height of a balustrade is 1 metre and if protecting a pool area, access would need to be 1.2 metres.”

The common different types of glass permitted for use in balustrades include:

  • Laminated safety glass

    Comprises two pieces of normal glass adhered to a plastic interlayer. When laminated safety glass is broken the shattered pieces tend to remain affixed to the plastic interlayer creating a ‘spider web’ effect. As long as the impact is not severe enough to pierce or dislodge the glazing the broken glass tends to remain in place. A minimum thickness of 6mm is permitted for infill panels, 8mm for structural panels and is not advised for structural cantilever panels.

  • Toughened safety glass

    Generally four to five times stronger than ordinary glass and in the event of breakage the glass fractures into small harmless fragments and will no longer support a load or act as a barrier. Consequently, toughened glass that is not fully framed is likely to fall from its fixings and would not prevent the penetration of the impacting object (or person) possibly to a level below. A minimum thickness of 6mm is permitted for infill panels, 8mm for structural panels and 10mm for structural cantilever panels.

  • Toughened laminated glass

    A combination of toughened single pieces of glass that have been laminated. The benefit of toughened laminated glass is its strength and performance under impact. It is capable of withstanding large loads and in the event of being broken the resulting fragments will be retained by the interlayer. When properly glazed, it normally will remain in place which enhances safety and security. A mini-mum thickness of 8mm is permitted for infill panels, 8mm for structural panels and 10mm for structural cantilever panels.


To avoid causing damage to the glass when cleaning, steer clear of these cleaning mistakes:

  • Do not use cleaners which contain Hydrofluoric or Phosphoric acid as they are corrosive to the glass surface.
  • Do not clean the glass when the glass is hot or in direct sunlight.
  • Do not allow cleaning solutions to contact the edges of Laminated glass, Insulating Glass Units or Mirrors.
  • Do not store or place other material in contact with the glass. (This can damage the glass or create a heat trap leading to thermal breakage).
  • Abrasive cleaners, powder based cleaners, scouring pads or other harsh materials should not be used to clean windows or other glass products.
  • Avoid causing extreme temperature changes to the glass as this may lead to thermal fracture of the glass, i.e. do not splash hot water on cold glass or freezing water on hot glass.
  • Some tapes or adhesives can stain or damage glass surfaces. Avoid using such materials unless they are known to be easily removed.

Mirrors require special cleaning care. To clean mirrors, simply wipe over the surface with a few drops of methylated spirits on a damp cloth. Polish surface dry with a lint free cloth. Some proprietary glass cleaners, if used to excess, can cause damage to the silvering as can excessive amounts of water. Make certain when cleaning the face of the mirror that there is no contact with the silver backing, particularly at the edge of the glass and be careful to keep any moisture away from the paint backing of the mirror. Do everything possible to ensure that the cleaning cloths used are free of any abrasives.

There are generally three components to be considered when solving a noise problem. These are the external noise, the noise reduction of the wall (windows and glazing) and the resulting noise in the room. The process of design requires that the external noise level is determined by measurement and the desired internal noise level is decided. The design exercise is then to construct the wall in order to reduce the external noise level to that desired in the room – where the external noise is known from measurements and the internal noise level is recommended (ISO 140). For glass, this would involve subtracting the Rw value of the external noise level from the desired internal level to determine the type of glass required.

The source of the noise may be higher at certain frequencies. Typically, suburban traffic noise is a low frequency noise, while aircraft produce a high frequency noise.

A detailed solution would involve measuring the nature and intensity of the offending sound and choosing a glass product which would reduce the intensity sufficiently at all frequencies. It should be noted that glass is only one part of the room and all other components must be assessed as well. Example: For a living room on a busy street, the required glass Rw value is 75dB (busy street) – 40dB (living room) = 35dB (glass).

For details on recommended interior noise levels and sound insulation data, see Viridian’s guide.

If you work in glass and glazing, be aware of common hazards and how to avoid injury.

Common hazards include:

  • Loading and unloading glass from shipping containers, particularly those with closed tops
  • Loading and unloading vehicles or timber packaging, where glass may have moved during freight
  • Being hit by falling glass due to unsafe lifting techniques
  • Not using appropriate Personal Protective Equipment (PPE)
  • Moving, handling and storing glass sheets.

Tips to stay safe when storing and handling glass sheets:

  • Never restrain glass by hand
  • Use the right mechanical lifting aids
  • Keep the work area tidy
  • Have a lifting plan
  • Stand clear of glass sheets when moving them
  • Use a suitable trolley or A Frame
  • Activate trolley brakes and remove restraints when loading and unloading
  • Avoid accessing sheets from the middle of the stack
  • Educate workers
  • Wear appropriate PPE.

For more tips on the safe handling of glass, watch this video from WorkCover NSW.

Are you using the right protective gear at all times? The Australian Glass and Glazing Association recommend the following minimum personal protective equipment (PPE) for glazing processes and activities.

Transporting and Receiving Glass Products

Minimum PPE protection should include eye, foot, wrist, hand and body protection.

Glass Processing

Minimum PPE protection should include eye, foot, wrist, hand and body protection


Minimum PPE protection should include eye, foot, wrist and hand protection.

Toughening Process

Minimum PPE protection should include eye, foot, wrist, hand and body protection. Laminate, Heat Soak, IGU Processing, Painting, Additional Processing Minimum PPE protection should include eye, foot, wrist and hand protection.

On Site Glazing

Minimum PPE protection should include eye, foot, wrist, hand and body protection.


Before unloading glass, it is essential you consider the following safety factors.

  • Licenced trained operators only to operate equipment (forklift, crane, dogman etc)
  • All equipment must be suited to the task, including load capacities.
  • Storage equipment to have correct angle.
  • Load restraints (clamps, binders etc) only to be removed when safe to do so.
  • All storage, unload areas should be free from slip/trip hazards.
  • All vehicles should be guided into a safe unload position.
  • Clear access and egress to load.
  • All loads should be inspected for any damage or load shifts prior to unloading
  • Load and unload floor surface to be level and suited to withstand the load.
  • Truck must remain level during unloading. Hydraulic ramps on truck or other methods may be required.
  • Glass should be unloaded evenly


There are a number of considerations for storing glass safely.

  • All storage areas should be free from slip/trip hazards.
  • Restrain glass in windy conditions.
  • When storing glass on trolleys in a ‘static position’, ensure trolley-braking devices are engaged and restraining bars are used.
  • Ensure there is a minimum of 600mm clearance between storage racks.
  • Ensure adequate clearance between the edge of the storage rack and building walls – minimum 800mm.
  • Glass stored on frames should be evenly loaded on both sides of the frame.
  • Never stack glass against walls.
  • Any cases of glass or end caps stored in a vertical position need to be appropriately restrained, e.g. inverted T’s or case props.
  • Conduct regular inspections of blocks and cases in storage for any previously unknown damage to sheets.
  • Ensure employees are properly trained in correct storage techniques.


Before attempting your next caulking project, read Red Devil’s handy tips.

  1. Start with the right tools

    Your project will run more smoothly if you keep these items handy:

    • Sponge
    • Paper towels
    • Small bucket of water
    • Mild bathroom cleaner
    • Caulk smoother
    • 5-in-1 Tool or utility knife (for removing old caulking)
  2. Prep your surface

    Making sure that the surface you are going to caulk is clean and well-prepared is essential to achieving good adhesion and a smooth bead. Here are a few helpful hints in preparing the surface:

    • Clean off any dust or dirt particles with water. Do not use soap.
    • Using a Red Devil 5-in-1 tool or utility knife, remove any remnants of old caulking. New caulk will not adhere well to acrylic caulk that has been cured - and will not stick at all to cured silicone caulk.
    • After you have removed most of the old caulk with a blade (being careful not to scratch the surface), clean any remaining residue with a mild abrasive or rubbing alcohol.
    • If the surface is mildewed, use a concentrated mildew killer after removing the old caulk.
  3. Ensure your product is fresh

    Caulk has a shelf life of one to two years. To ensure that your caulk is fresh enough to work properly, test it on a non-porous surface before you begin your project. Make sure that the caulk sticks, comes out of the cartridge smoothly, and most importantly, that it cures in the time it is supposed to.

  4. Know how much you need for the job

    One standard cartridge contains enough caulk to cover 26 linear feet (7.92m) with a 1/4" x 1/4" (6x6mm) bead.

  5. The best filling techniques

    • The best fill is usually achieved by pushing the caulk out into the gap in a forward motion. However, in some cases (particularly where the side materials are rough or uneven) a pulling motion may work better, as the cartridge will be less likely to get snagged along the joint.
    • It's better to apply a thin bead of caulk and add a little more if necessary than to apply too much and attempt to remove the excess.
    • If you plan to paint over the caulk, a white caulk is a better choice than a clear paintable caulk, which takes longer to cure and is more likely to shrink.

Visit Viridian Trade Centre for a range of Red Devil tools and consumables.


Dust and debris can accumulate in your power tools causing malfunctions if left unchecked.

To avoid this, always use a rag to wipe them clean after a job, before storing them. Periodically give your power tools a deeper clean by using a damp cloth. You can get into exhausts and other hard to clean places with a lightly oiled cotton swab or slender tools. An air compressor is a useful tool in blowing dirt and dust from the vents and crevices of your power tools.

Simply visit the team at your local Viridian Trade Centre and complete the credit application form. See in store for full Terms & Conditions.

Viridian Trade Centre operates under 30-days from statement terms.

Viridian Trade Centre welcomes all major credit cards (excluding Diners Card), Eftpos, Electronic Transfers and Cash.

Feel free to contact your local Viridian Trade Centre with any Sales enquiries, and we will get you in touch with the right representative to your needs.

Yes we do. Contact your local store to find out how we can help you with hire needs.

Unfortunately, Viridian Trade Centre does not offer Gift Vouchers.

Currently, you cannot order stock online through the trade centre, but there are future plans to offer this. Watch this space!

Depending on the size of the order we aim to provide a turnaround time of 24 hours on glass processing.

We offer cut-to-size, polishing and washing services, as well as drilling holes and many other requests. Chat with the team today to see if we can help with your next job!

Of course! Our Rosebery sites currently delivers within the South Sydney region. Please contact us if you are outside of this area, and we’ll work out how we can best help!

We do not currently have any advertised positions, however we are always happy to receive applicants! Feel free to send through your resume to

At Viridian Trade Centre we have access to Viridian’s full range of products. Whilst we do keep a stock of a huge range on site at Rosebery, we can also order any additional stock you may require.