At Andrew Wright Glass, we manufacture and supply high-quality double glazed units (DGUs) designed to withstand Scotland’s challenging weather. Whether you’re looking for energy-efficient glass, noise reduction, or custom features like Georgian bars, our products are crafted to the highest standards. Below, we answer the most common questions about double glazed units to help you make an informed decision.
What is a double glazed unit?
A double glazed unit (DGU) consists of two panes of glass separated by a spacer bar and sealed to create an insulating gap. This gap is filled with air or gas to improve thermal efficiency and reduce noise transmission. Unlike full window replacements, DGUs can be installed into existing frames, making them a cost-effective way to upgrade insulation.
Studies show that upgrading to double glazing can reduce heat loss by up to 50% and cut energy bills by up to 20%.
What gases are used in double glazed units?
The most common gas used in Andrew Wright Glass DGUs is argon gas, which improves insulation by reducing heat transfer. Krypton and xenon are also options for superior performance, often used in triple glazing. These gases slow down thermal movement, keeping homes warmer in winter and cooler in summer—a vital benefit in Scotland’s ever-changing climate.
Argon-filled double glazing is the more affordable option in comparison to Krypton and Xenon and can improve thermal efficiency by up to 30% compared to air-filled units.
How are double glazed units made?
At Andrew Wright Glass, our DGUs are manufactured using precision machinery:
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- Cutting – Glass is cut to size.
- Spacer Bar Installation – Warm edge spacers are inserted.
- Gas Filling – Argon or krypton gas is injected for insulation.
- Sealing – Units are hermetically sealed for longevity.
- Quality Testing – Every unit is tested to ensure compliance with British Standards, ensuring U-values as low as 1.2 W/m²K.
Frequently Asked Questions About Double Glazed Units:
How long do double glazed units last?
With proper installation, our DGUs last 20–30 years, thanks to high-quality sealing and materials. Regular maintenance and avoiding physical damage can extend their lifespan even further.
Can you recycle double glazed units?
Yes! Double glazed units are recyclable, with the glass and spacer bars being repurposed for new products. Many glass processors and waste management companies offer specialised recycling services to ensure materials are disposed of responsibly and sustainably.
Do double glazed units provide soundproofing?
Yes! Double glazed units significantly reduce noise pollution by creating a barrier between external sounds and your home. Acoustic glass and laminated glass further enhance soundproofing, reducing external noise by up to 39dB. This makes DGUs ideal for homes near busy roads, airports, or city centres.
What is a warm edge spacer, and why does it matter?
A warm edge spacer is a non-metallic or low-conductivity material used between the panes to reduce heat transfer and minimise condensation. Our Andrew Wright Glass DGUs feature warm edge technology, which can improve thermal efficiency by up to 65% compared to standard aluminium spacers, helping to lower heating bills.
Are double glazed units vacuum sealed?
No, double glazed units are not vacuum sealed but rather gas-filled and hermetically sealed to prevent gas leakage and moisture ingress.
How thick should a double glazed unit be?
The standard thickness for DGUs is 28mm (4mm glass – 20mm spacer – 4mm glass). However, we manufacture units in various thicknesses, from 14mm to 44mm, depending on insulation, security, and noise reduction needs. Thicker units can reduce external noise by up to 40% compared to standard single glazing.
Are double glazed units toughened?
Standard DGUs are made from float glass, but we also offer toughened glass DGUs, which are required in doors, low-level windows, and safety-sensitive areas. Toughened glass is up to five times stronger than standard glass and is designed to shatter into small, harmless pieces upon impact.
Can double glazed units shatter?
Yes, but only under extreme pressure or impact. Toughened or laminated DGUs are more resistant to breakage, making them ideal for high-security applications
Can a failed double glazed unit be repaired?
No, once the seal has failed, the unit must be replaced. Some companies offer mist removal services, but this is only a temporary fix. The best solution is a new DGU to restore energy efficiency. We manufacture custom replacement DGUs to fit existing frames perfectly, helping homeowners maintain A-rated energy efficiency. This also goes for the commonly asked question ‘Can a double glazed unit be regassed?’ and again the answer is no, once this has failed the unit must be replaced.
What causes double glazed units to fail?
Common reasons include seal failure, poor manufacturing, extreme weather exposure, and incorrect installation. Investing in high-quality BSI-certified DGUs like those from Andrew Wright Glass significantly reduces the risk of failure.
What causes condensation inside a double glazed unit?
Condensation inside the panes happens when the unit’s seal fails, allowing moisture to enter. This is known as blown or misted glass, meaning the insulating properties are lost. Poor installation, prolonged exposure to harsh weather, or low-quality manufacturing can accelerate seal failure. Andrew Wright Glass manufactures DGUs with high-quality seals to prevent this, ensuring longevity and performance.
What types of glass can be used in a double glazed unit?
At Andrew Wright Glass, we offer a variety of glass types, including:
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Clear float glass – Standard for general applications.
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Low-E glass – Reduces heat loss, ideal for energy efficiency.
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Toughened glass – Five times stronger than standard glass, ideal for security and safety.
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Laminated glass – Provides extra security and noise reduction, reducing external noise by up to 39dB.
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Acoustic glass – Ideal for reducing outside noise, great for city homes or properties near busy roads.
With decades of experience, Andrew Wright Glass is a trusted name in double glazed unit manufacturing in Scotland. We offer:
✔ Custom-made DGUs for trade and domestic customers
✔ Energy-efficient and durable solutions with U-values as low as 1.2 W/m²K
✔ Competitive pricing and expert advice tailored to Scotland’s weather conditions