Frameless vs Framed Rooflights: Which One Is Right for You?
When choosing a rooflight for your home, one of the biggest decisions is whether to go for a framed or frameless design. While frameless rooflights offer a modern, seamless appearance, framed options provide additional structural support and long-term durability.
To help you make an informed decision, let’s explore the key differences between the two.
- Design
- Frameless Rooflights: These have no border, lower profile and create a clean and contemporary aesthetic. The glass panels sit directly on top of the upstand/kerb with large portion of the glass overhanging. There is no mechanical fixing to secure the glass to the upstand.
- Framed Rooflights: These feature an aluminium or steel frame around the perimeter, holding the glass securely in place. The frame is usually hidden internally, but it plays a crucial role in protecting the unit from external elements and provides support to underside of the glass.
- Structural Integrity
- Frameless Rooflights: These rely on adhesives and sealants instead of a rigid frame. Over time, exposure to weather can weaken these bonds and damage to structure leading to potential leaks in the roof. There have even been cases where frameless rooflights have detached in extreme conditions.
- Framed Rooflights: Rooflights that are fixed within a frame are excellent at preventing leakage. Water on the glass runs off the side of the frame onto the roof, where it is then removed by the roof’s gutter. Additionally, the chance of water seeping under the glass or frame is greatly minimized, as the frame protects the sides of the upstand.
3. Weatherproofing & Water Resistance
- Frameless Rooflights: The lack of a frame means that silicone seals are directly exposed to rain, UV rays, and temperature changes. Over time, this exposure can lead to seal failure, leaks, and water ingress, requiring frequent maintenance.
- Framed Rooflights: The integrated frame acts as a protective barrier against rain and wind, improving weather resistance. Many high-quality framed rooflights include drainage systems to channel water away effectively.
4. Thermal Performance & Energy Efficiency
- Frameless Rooflights: Since there is no frame to provide insulation, heat loss can be greater. Some designs also suffer from cold bridging, which can lead to internal condensation issues.
- Framed Rooflights: Rooflight Frames which are designed with thermal breaks, helping to reduce heat loss. This improves insulation, keeping your home warmer in winter and cooler in summer, which can lower energy bills.
5. Manufacturing Cost
- Frameless Rooflights: Frameless rooflights typically come at a lower initial price compared to framed options. Since they don’t have a frame, the manufacturing process is generally simpler, which reduces production costs. This makes them an attractive choice for homeowners seeking a modern, minimalist design on a budget. However, it’s important to note that while the upfront cost is lower, frameless rooflights can come with hidden long-term costs.
Frameless rooflights rely on adhesives and sealants to hold the glass in place, and over time, exposure to weather conditions like UV rays, rain, and temperature changes can weaken these bonds. This not only increases the risk of leaks but could also lead to the glass detaching in extreme conditions, potentially damaging the roof structure. Furthermore, frameless designs often lack the structural support provided by a frame, which can lead to load-bearing issues, especially if the rooflight is large or subjected to heavy rainfall or snow. These structural vulnerabilities can increase the risk of breakage or failure, leading to costly repairs or even the need for full replacements in the future.
- Framed Rooflights: Framed rooflights tend to come at a higher initial price point due to the materials used for the frame and the extra design and manufacturing work involved. Frames made from materials like aluminum or steel provide additional strength and structural support, making these rooflights more durable and long-lasting. The added frame helps secure the glass in place, reducing the risk of detachment or damage under extreme weather conditions, such as heavy rain, snow, or strong winds. This enhanced structural integrity contributes to the higher upfront cost but provides significant value over time.
6. Compliance with UK Building Regulations
- Frameless Rooflights: Some frameless designs may struggle to meet these standards, particularly in terms of structural integrity and thermal efficiency. In most cases, frameless rooflights are offered in a triple-glazed option to achieve low U-values and compensate for heat loss. Even though the triple-glazed option may seem like a great deal, in many cases, it performs worse than some double-glazed units.
- Framed Rooflights: These are more likely to meet Part L (thermal efficiency) and Part Q (security) of UK building regulations, ensuring long-term compliance.
Which One Should You Choose?
If you’re looking for a stylish and budget-friendly way to bring more natural light into your home, frameless rooflights are a great option. They offer a sleek, modern look while keeping costs down.
On the other hand, if durability, weatherproofing, and energy efficiency are your top priorities, framed rooflights might be the better choice in the long run. They provide extra protection against the elements and can help with insulation, making them a solid investment for your home.
