PVB vs SGP Laminated Glass for Rooflights: What’s the Best Choice for Your Project?
When picking laminated glass for your rooflights or structural glazing, one of the biggest choices is the type of interlayer to use. The two most common options are PVB (Polyvinyl Butyral) and SGP (SentryGlas Plus). Each works best in different situations depending on what you need — whether that’s budget, strength, safety, or how it looks.
This article will explain the differences between PVB and SGP glass so you can decide which suits your project. Whether you’re working with a rooflight company, planning overhead glazing, or designing structural glass features, understanding these materials will help you get the best results.
What Are PVB and SGP Interlayers?
PVB is the traditional interlayer used in laminated glass. It’s been around for decades and is known for being clear and sticky. You’ll find PVB in car windshields, interior glass walls, and many rooflight glazing panels.
SGP is a newer, tougher interlayer made by DuPont. It’s much stronger and stiffer than PVB. Because of this, SGP is often used in demanding structural glazing projects like frameless balustrades or overhead glazing where strength matters most.
How Do They Compare?
PVB: Reliable and Flexible
PVB works well for everyday rooflights and indoor glazing. It holds broken glass together to keep people safe if it cracks. But it doesn’t add much strength to the glass itself. It’s mostly about safety and looks.
SGP: Strong and Stiff
SGP is five times stronger and one hundred times stiffer than PVB. This means you can use thinner glass without losing strength. It’s perfect for structural glazing, heavy-duty rooflights, or any overhead glazing where safety and durability are key.
What About Durability?
PVB can struggle with moisture. If your rooflights or glazing face humid or wet conditions, PVB may cloud up or separate over time. That’s not good for outdoor use or places exposed to weather.
SGP handles moisture, UV rays, and temperature changes much better. It stays clear and strong for longer, making it ideal for outdoor rooflights, overhead glazing, and buildings near the coast.
Cost Differences
PVB is affordable and great for projects on a budget. It’s the common choice when strength is less critical.
SGP costs more — usually three to five times as much. But the extra price gets you stronger, longer-lasting glass. For structural glazing or high-end rooflight projects, this can be worth the investment.
Where Are They Used?
PVB Laminated Glass:
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Car windshields
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Interior glass walls and doors
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Commercial windows in mild climates
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Decorative glass and some skylights
SGP Laminated Glass:
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Structural glass facades and curtain walls
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Frameless glass balustrades
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Glass staircases, floors, and bridges
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Security glazing like bullet or blast resistant glass
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Rooflights and overhead glazing needing extra strength
Quick Look: Pros and Cons
| Feature | PVB Laminated Glass | SGP Laminated Glass |
|---|---|---|
| Strength | Standard safety glass | High structural strength |
| Rigidity | Flexible | Very stiff |
| Weather Resistance | Moderate, can delaminate | Excellent, moisture resistant |
| Clarity Over Time | May yellow or cloud | Stays clear longer |
| Cost | Affordable | Expensive |
| Best For | Interiors, rooflights in mild conditions | Structural, outdoor, security glazing |
Final Thoughts
If your project is mostly indoors or on a budget, PVB laminated glass will do the job well. It’s been trusted for years and works great for most rooflights and structural glazing inside buildings.
But if you need strong, durable glass that will last outdoors or support heavy loads, SGP is the smarter choice. It costs more but delivers better safety, strength, and clarity — perfect for high-end rooflights or overhead glazing.
Need Help Deciding?
Choosing the right glass can be tricky. A good rooflight company or glazing specialist can help you pick the best laminated glass for your project. Reach out to get expert advice tailored to your needs.
