All About Insulated Glass Units
7016619712 • February 3, 2025

ALL ABOUT INSULATED GLASS 

Have you noticed you look through your window and the view is foggy but outside it’s a beautiful

clear day? Have you noticed a milky streak that you’ve attempted to clean countless times and

nothing works? More than likely what you are experiencing is a failed insulated (dual pane)

glass unit. The lifespan of a typical unit is anywhere from 10 – 20 years. Our goal is always to

provide you with excellent customer service and all the information you need to make an

informed decision. Below you will find how an insulated glass unit is constructed and also why

can cause a unit to fail.



Construction of Insulated Glass Units (IGUs)


An Insulated Glass Unit (IGU), often referred to as double glazing or triple glazing, consists of

multiple panes of glass separated by a spacer to create a sealed cavity. This construction

improves thermal and sound insulation. Here is how they are typically constructed:


1. Glass Panes

 

  •  IGUs use two or more glass panes (e.g., clear, tinted, or Low-E coated glass).
  •  The panes are separated to create an insulating air or gas-filled space.

 

2. Spacer

 

  •  A spacer, usually made of aluminum or stainless steel, separates the panes and

 

maintains uniform spacing.

 

  •  It is filled with a desiccant material to absorb moisture and prevent condensation inside

 

the sealed space.


3. Sealant

 

  •  The spacer and glass edges are sealed using dual-seal systems:
  • Primary Seal: Polyisobutylene (PIB) to prevent gas leakage and moisture  ingress.

 

 

  • Secondary Seal: Silicone or polysulfide for structural integrity and protection

 

against external elements.


4. Insulating Gas

 

  •  The cavity between the panes is filled with air or insulating gases like argon, krypton, or

 

xenon to enhance thermal performance.


5. Edge Treatment

 

  • Some IGUs have Low-E coatings or films applied to one or more panes to improve

 

thermal efficiency by reflecting heat while allowing visible light to pass.


Why Insulated Glass Units Fail

Despite their durability, IGUs can fail over time due to various reasons. Common failure

mechanisms include:

1. Seal Failure

  • Causes:
  • UV radiation degrades the sealant over time.


  • Thermal expansion and contraction stress the sealant.
  • Poor installation or manufacturing defects.
  • Effects:
  • Moisture enters the cavity, causing fogging or condensation.
  • The insulating gas escapes, reducing thermal efficiency.


2. Spacer Corrosion

  • Metallic spacers can corrode if exposed to moisture, compromising the structural

integrity and seal.


3. Desiccant Saturation

  • Over time, the desiccant in the spacer may become saturated with moisture, allowing

condensation inside the unit.


4. Thermal Stress

  • Uneven heating and cooling of the glass can cause stress cracks, leading to seal failure

or breakage.


5. Mechanical Damage

  • Impact or improper handling during installation or cleaning can damage the glass or

seals.


6. Poor Manufacturing

  • Low-quality materials or poor workmanship can lead to improper sealing or weak

spacers, reducing the lifespan of the unit.


7. Age and Wear

  • Over time, natural aging processes cause the materials to degrade, typically after 10–20

years.


Prevention and Mitigation

  • Use high-quality materials and reputable manufacturers.
  • Ensure proper installation with adequate allowances for expansion and contraction.
  • Regularly inspect windows for early signs of seal degradation or fogging.
  • Opt for modern IGUs with advanced sealants, warm-edge spacers, and high-

performance coatings for longevity.


Most customers think that it is going to be a huge expense or that they have to change out the

entire window, 90% of the time this is not the case. Changing a unit is typically quick and less

invasive to your living or work space. Give us a call or send us an email and one of our

experienced Project Managers can provide you with an estimate.


Golden West Glass --- Serving the North Bay Since 1978

5 Signs It’s Time to Replace Your Windows (And How It Saves You Money)

By 7016619712 • March 21, 2025
Windows play a crucial role in your home's comfort, energy efficiency, and aesthetic appeal. But like any part of your home, they don’t last forever. Ignoring signs of aging or failing windows can lead to higher energy bills, reduced comfort, and even safety concerns. How do you know it’s time to replace your windows? Here are five telltale signs to watch for — and how upgrading can actually save you money in the long run. 1. Drafts and Poor Insulation Have you noticed a chill near your windows during the winter or heat seeping through in the summer? Drafts are a common sign that your windows are no longer insulating properly. Why This Matters: Drafty windows make your heating and cooling systems work harder, driving up energy costs. Upgrading to energy-efficient, insulated glass windows can reduce energy bills by as much as 30% annually, according to the U.S. Department of Energy. 2. Condensation Between the Panes If you’re seeing fog or condensation trapped between the glass panes, it’s a sign that the seal on your insulated glass unit (IGU) has failed. Why This Matters: A broken seal means your window is no longer effectively insulating. Beyond the unsightly fog, this issue compromises energy efficiency. Replacing the affected windows restores clarity and keeps your home comfortable. 3. Cracks, Chips, or Broken Glass Cracks and chips not only look bad but can also be a safety hazard, especially for families with children or pets. Why This Matters: Damaged windows can worsen over time, making them more prone to breaking. Replacing cracked or chipped glass ensures your home stays safe and secure while maintaining its curb appeal. 4. Rising Energy Bills Have you noticed your energy bills creeping up even though your usage hasn’t changed? Your windows might be to blame. Why This Matters: Old or inefficient windows allow heat to escape in the winter and enter in the summer, putting extra strain on your HVAC system. Installing modern, energy-efficient windows with Low-E coatings and gas fills (like argon or krypton) can significantly cut energy costs while improving indoor comfort. 5. Outdated Appearance Are your windows stuck in the past? Older windows with peeling frames, discolored glass, or dated designs can make your home look tired. Why This Matters: Replacing old windows can transform the look of your home, boosting curb appeal and property value. Sleek, modern designs offer style and functionality, making your house more attractive to potential buyers. How Replacing Your Windows Saves You Money Replacing windows may seem like a big investment, but the savings quickly add up: Lower Energy Bills: High-efficiency windows reduce heat loss and gain, cutting energy costs. Reduced Maintenance Costs: Modern windows are designed to last longer and require less upkeep. Increased Home Value: New windows are a sought-after feature for potential buyers, offering a great return on investment. Time to Take Action! If you’ve noticed any of these signs, it’s time to consult the experts. At Golden West Glass , we specialize in high-quality window replacement services designed to enhance comfort, save you money, and elevate your home’s appearance. Call us at 707-939-9604 or visit https://www.goldenwestglass.com/ to schedule your consultation. Don’t Wait — Act Now! Ignoring failing windows can cost you more in the long run. Upgrade your home with energy- efficient, beautiful windows that save you money and keep you comfortable year-round. Let’s make your home brighter, cozier, and more efficient — one window at a time!