Frequently Asked Questions (FAQs):

Welcome to our FAQ page! Here, we have gathered answers to the most commonly asked questions about double glazing, uPVC windows, our products, and more. Whether you’re curious about the benefits of double glazing, the durability of uPVC, or the warranty coverage, you’ll find the information you need. Take a moment to explore our FAQs below, and if you have any additional questions, please feel free to contact our knowledgeable team. We are here to assist you in making informed decisions about your window and door solutions.

Frequently Asked Questions (FAQs)

Your Queries, Answered

Double glazing refers to a window or door construction technique where two glass panes are separated by a gap, leaving a small space between them. The gap is typically filled with air or sometimes an inert gas, such as argon, to improve the insulation properties. This construction creates a more energy-efficient barrier compared to single-glazed windows.

uPVC stands for “unplasticised polyvinyl chloride,” and it is a type of rigid plastic commonly used in the construction industry, particularly for windows, doors, and other building components. Unlike traditional PVC, which contains plasticizers to make it flexible, uPVC is “unplasticised,” meaning it does not contain these additives and remains rigid.

uPVC is popular for various reasons, including its durability, low maintenance requirements, and energy efficiency. Some key features and benefits of uPVC include:

  1. Weather Resistance: uPVC is highly resistant to weathering, including sunlight, rain, and temperature fluctuations. It does not rot, corrode, or warp, making it well-suited for outdoor applications.

  2. Energy Efficiency: uPVC has excellent insulation properties, which help reduce heat transfer through windows and doors. When used in conjunction with double or triple glazing, it can contribute to energy savings and improved thermal comfort in buildings.

  3. Low Maintenance: uPVC is relatively easy to clean and maintain. It does not require painting or sealing, and it can be kept looking new with simple cleaning using mild soapy water.

  4. Longevity: uPVC is a durable material that can last for many years without significant degradation. It resists pests, such as termites, which can be a concern with traditional wooden frames.

  5. Recyclability: uPVC is recyclable, which is beneficial for sustainability and environmental considerations.

  6. Affordability: uPVC is often more cost-effective than other materials like wood or aluminum, making it a popular choice for budget-conscious projects.

uPVC is widely used in the manufacturing of window frames, doors, conservatories, and other building elements due to its favorable properties. It is available in various colors and finishes, providing versatility in design choices for construction projects.

The uPVC used in Australia is UV treated to withstand our climate, making it a reliable option for homeowners.

  1. Energy Efficiency: Provides excellent insulation, reducing heating and cooling costs.
  2. Durability: Resistant to weathering, UV rays, and harsh climates.
  3. Low Maintenance: No painting or sealing required; easy to clean.
  4. Noise Reduction: Offers good sound insulation for a quieter indoor environment.
  5. Termite & Corrosion Resistance: Not susceptible to termites and doesn’t corrode.
  6. Aesthetics: Available in various styles and colors to match home designs.
  7. Sustainable & Affordable: Recyclable material and cost-effective option.

Overall, uPVC windows combine energy efficiency, durability, and aesthetic appeal, making them an excellent choice for Australian homes, especially in varying climates and coastal areas.

A U-value, also known as thermal transmittance, is a measure of how effective a building material or assembly is as an insulator. It quantifies the rate of heat transfer through a specific material or construction, indicating how well it can resist the flow of heat.

The U-value is typically used to assess the thermal performance of elements such as walls, roofs, floors, doors, and windows. It is expressed in units of watts per square meter kelvin (W/m²K).

The lower the U-value, the better the material or assembly is at preventing heat transfer, and thus, it offers better insulation properties. 

By using materials and components with low U-values, builders and architects can improve the overall energy efficiency of a structure and reduce the amount of energy required for heating and cooling, leading to cost savings and reduced environmental impact.

We offer a range of standard color options, including white, cream, ash black, silver, grey aluminum, anthracite grey, golden oak, and nut tree. Additionally, we provide dual-color options, with white on the inside and a different color on the exterior. We also offer premium colors at an additional cost.

Yes, double glazing can significantly reduce noise from outside sources and provide a quieter indoor environment. The two layers of glass with an air or gas-filled gap in between act as a barrier to sound transmission, making it more difficult for external noises to penetrate into the interior of a building.

The sound reduction capabilities of double glazing depend on various factors, including the thickness of the glass panes, the width of the gap between them, and the specific frequency of the noise. Generally, the wider the gap and the thicker the glass, the better the sound insulation.

While double glazing is not entirely soundproof, it can effectively dampen noise from traffic, construction, or other external disturbances, creating a more peaceful and comfortable living or working environment inside the building. For even higher levels of sound insulation, some specialized acoustic glass options are available, which can further enhance noise reduction capabilities.

Forever Green Windows offers a comprehensive 10-year warranty that covers frames, glass, and hardware. Our flyscreens come with a one-year warranty.

  • Over 55 years combined experience
  • 10 years guarantee for uPVC profile frames 
  • 10 years guarantee for faults or failure of double glazed units
  • 10 years guarantee for all window hardware

The typical manufacturing time for our windows is between 4 to 8 weeks, depending on the current schedule and project requirements.

Forever Green Windows is a supply only company however if installation is needed, we have a network of experienced installers at the ready.

We do offer a partial installation service for new builds. This type of service can provide flexibility for the builder. The builder can install the reveals, frames, and flashing. Once that has been completed Forever Green Windows takes over the glazing of the windows and doors, as well as fitting the flyscreens and the handles.

This ensures that the critical components related to functionality are properly installed by the window professionals.

If you have any questions regarding the installation process, please contact Gary Saunders to discuss.

We recommend using a mild soapy detergent to clean the frames and glass of your windows. Avoid using abrasive cleaners that can damage the uPVC material. It is also advisable to lubricate the moving parts of the hardware components every few months for smooth operation.

Yes, the majority of our windows and doors have been tested and meet BAL ratings up to BAL-40, ensuring they comply with the required standards for bushfire attack levels. BAL stands for Bushire Attack Level. The BAL assessment is a means on measuring the severity of a building’s potential exposure to three different ways a bushfire can attack a property:  

They are: Ember attack, radiant heat, and direct flame contact.
There are 6 levels of BAL rating:

  • BAL – Low –Lowest Risk – There is insufficient risk to warrant specific construction requirements
  • BAL – 12.5 – Low Risk – Ember attack
  • BAL – 19  –  Moderate Risk – Increasing levels of ember attack and burning debris ignited by wind-borne embers together with increasing heat flux between 12.5 and 19 kW m2
  • BAL – 29 – High Risk – Increasing levels of ember attack and burning debris ignited by wind-borne embers together with increasing heat flux between 19 and 29 kW m2
  • BAL – 40 – Very High Risk – Increasing levels of ember attack and burning debris ignited by wind-borne embers together with increasing heat flux with the increased likelihood of exposure to flames
  • BAL- FZ (Flame Zone) – Extremely High Risk – Direct exposure to flames from fire front in addition to heat flux and ember attack.


At Forever Green windows the majority of our windows and door have undergone testing and achieved ratings of varying ratings and up to BAL-40. To achieve either of these ratings our frames are reinforced with steel and the external flyscreens are metal mesh. Please ask one of our team members about complying with your BAL rating today.

No, at Forever Green Windows, we prioritise energy efficiency and we believe in providing windows and doors that offer optimal thermal protection and insulation.

We proudly service the Southern Highlands, Western Sydney, Blue Mountains, Sutherland Shire, Wollongong and South Sydney.

Double glazing adds value to your home in multiple ways. As global energy requirements evolve, homeowners are increasingly opting for double glazing to lower energy costs. This energy efficiency improvement becomes an attractive selling point for potential buyers, making your property more desirable and valuable in the long term.

The lifespan of double glazing can vary depending on several factors, including the quality of the materials, the manufacturing process, and the environmental conditions to which the windows are exposed. Generally, well-maintained and high-quality double glazing can last for around 20 to 35 years or even longer.

Deceuninck is a renowned global manufacturer of uPVC windows and doors with over 80 years of industry experience. Their long-standing expertise has earned them trust in the Australian market.

Operating in 91 countries, including Australia, Deceuninck’s widespread presence and extensive global operations showcase their reliability and capability. With 35 affiliates and a workforce of over 3500 employees, they have the resources and manpower to maintain high-quality standards.

Established in Belgium in 1937, Deceuninck has emerged as a leader in the industry due to their commitment to innovation, energy efficiency, and durability. Their products undergo rigorous testing to ensure they meet industry standards for performance and safety.

As a testament to their confidence in Deceuninck’s uPVC window and door profiles, Forever Green Windows proudly manufactures and resells their products. By partnering with Deceuninck, Forever Green Windows can offer customers premium-quality, reliable, and energy-efficient solutions for their homes and businesses.

We manufacture all windows in our Gregory Hills warehouse, where everything is made to order using state-of-the-art manufacturing equipment. 

Experience the Forever Green Windows Difference

Discover the Forever Green Windows difference for yourself. Contact us today for a personalized consultation and let us help you transform your home with our premium double-glazed windows and doors.
The Australian made logo.
Forever Green Windows is an Australian Owned Business and all our products are manufactured in Australia.