Replacing a Dome with a Flat Glass Rooflight: A Complete Guide

Dome skylights have long been a popular choice for homes and commercial buildings because they allow natural light to flood interior spaces and are relatively inexpensive. However, they also have limitations, such as poor thermal performance, difficulty in cleaning, and dated aesthetics. As a result, many homeowners and designers are now opting to replace a dome with glass to improve energy efficiency, update style, and modernize interiors. 

Upgrading a skylight by replacing a dome with a flat glass rooflight offers multiple benefits. It improves the quality of daylight, integrates seamlessly with modern rooflines, reduces the risk of leaks, and enhances the overall visual appeal of a property. Approaches such as flat glass retrofit and installing a refurbishment kerb allow for these upgrades while maintaining structural integrity. For high-quality options and expert guidance, visit Skylights Roof Lanterns to explore their range of modern flat glass rooflights. 

Understanding the Benefits of Upgrading Skylights 

Replacing a dome with flat glass significantly enhances energy performance. Dome skylights generally have higher U-values, allowing more heat to escape in winter and excessive heat to enter in summer. Flat glass rooflights, particularly those with double or triple glazing and low-emissivity coatings, provide superior thermal insulation, reducing heating and cooling costs while improving comfort. 

Aesthetically, flat glass rooflights offer a clean, minimalist appearance that complements contemporary architecture. Unlike dome skylights, which protrude from the roof, flat glass rooflights can sit flush or slightly raised on a kerb, creating a more elegant integration with the building. They provide unobstructed views of the sky and suit a variety of interior styles, from open-plan homes to commercial spaces that require abundant daylight. 

Maintenance is another key advantage. Dome skylights often accumulate dirt, debris, and algae, making cleaning challenging. Flat glass rooflights have smooth surfaces and can be installed with easier access for cleaning, reducing long-term maintenance costs and ensuring optimal daylight over time. 

When to Consider a Dome-to-Glass Replacement 

Not all domes need replacement, but there are several scenarios in which upgrading is beneficial. A dome should be considered for replacement if it shows signs of cracking, discoloration, or leaking, or if energy efficiency is a priority. Replacing the dome may also be appropriate if the original skylight no longer matches the building’s aesthetic or if cleaning has become difficult or unsafe. A professional installer can assess whether a refurbishment kerb or structural modifications are needed to support the new flat glass rooflight. 

Flat Glass Retrofit Options 

Flat glass rooflights come in fixed or ventilated forms. Fixed rooflights maximize daylight while maintaining a sleek, modern profile, whereas ventilated designs allow airflow, improving indoor air quality and reducing condensation. For retrofitting onto an existing dome kerb, a refurbishment kerb can provide the structural support needed to install a flat glass unit without major modifications to the roof. Structural reinforcement may also be necessary for larger rooflights or older buildings to ensure stability and maintain waterproofing. 

Materials and Glazing Options 

The choice of frame and glazing material is critical to performance. Aluminium frames are strong, low-maintenance, and weather-resistant, while timber or composite frames may be chosen for specific aesthetic preferences. Laminated or toughened glass enhances safety, and double or triple glazing improves insulation. Coatings such as low-emissivity or solar-control glass, along with inert gas fillings, further increase thermal efficiency. High-quality seals and gaskets ensure that flat glass retrofits remain watertight over time. 

Design Considerations for Dome-to-Glass Replacement 

When replacing a dome with a flat glass rooflight, careful consideration must be given to size, placement, and integration with the roofline. Proper placement ensures even daylight distribution, reduces glare, and optimizes thermal performance. For large open-plan areas, multiple rooflights may provide better light distribution than a single large unit. The flat glass rooflight should integrate seamlessly with the existing roof, using a refurbishment kerb to sit flush or slightly raised, ensuring a watertight seal. Ventilation and safety are also important, and laminated or toughened glass can provide additional security, while some units may include integrated blinds or shading to control solar gain. For guidance on replacing or upgrading older units, see our dome rooflights collection for high-quality options. 

Installation Process 

The process of replacing a dome with flat glass begins with a thorough assessment of the existing dome, roof structure, and kerb to determine whether a refurbishment kerb is necessary. The old dome is carefully removed to prevent damage to the roof. A refurbishment kerb is then installed to provide proper support, followed by the placement of the flat glass unit with attention to seals, gaskets, and flashing. After installation, testing for leaks and ensuring proper alignment completes the process. Professional installation guarantees the rooflight’s performance, durability, and compliance with building regulations. 

Dome vs Flat Glass Rooflights 

A flat glass rooflight offers several advantages over a dome. Flat glass improves energy efficiency due to superior glazing and coatings, provides a modern and sleek appearance that integrates seamlessly with contemporary architecture, and is easier to maintain because of its smooth surface. Ventilation options are available for flat glass units, while domes often have limited airflow. Overall, flat glass rooflights offer better light distribution, longevity, and reduced maintenance compared to traditional domes. 

Benefits of Upgrading Skylights 

Upgrading from a dome to flat glass provides improved natural light, better energy performance, modern aesthetics, and easier maintenance. Flat glass retrofits can also incorporate features such as integrated blinds, shading, and ventilation, making them a versatile and functional choice for residential and commercial buildings alike. 

Maintenance Tips 

Flat glass rooflights require minimal maintenance. Regular cleaning with a soft cloth and mild detergent prevents dirt buildup. Seals and gaskets should be inspected periodically to maintain a watertight fit, and flashing should be checked to prevent leaks. Annual inspections by a professional installer ensure long-term durability and optimal performance. 

Applications 

Replacing domes with flat glass rooflights is suitable for a variety of settings, including residential homes, commercial offices, retail spaces, and public buildings. They are ideal for modern extensions or refurbishment projects where maintaining roofline aesthetics, improving daylight, and reducing maintenance are priorities. 

Cost Considerations 

The cost of a dome-to-glass replacement depends on the size of the rooflight, glazing type, frame material, and any structural modifications required. While initial costs may exceed maintaining an existing dome, the long-term benefits, including energy savings, reduced maintenance, and improved property value, often outweigh the upfront expense. 

Future Trends 

Replacing domes with flat glass rooflights reflects a broader trend in contemporary architecture, focusing on daylight optimization, sustainability, and modern design. Future developments may include smarter glazing technologies, better insulation, integrated ventilation, and advanced shading systems that enhance comfort and efficiency. 

Conclusion: 

Replacing a dome with a flat glass rooflight is an effective way to modernize interiors, improve energy efficiency, and enhance aesthetics. Careful consideration of design, structure, glazing, and professional installation ensures a durable, visually appealing, and functional upgrade. Flat glass retrofits offer long-term benefits, making them a preferred choice for residential and commercial refurbishment projects. 

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