Skylight Types
1. Curb Mounted Skylights
Installed on a box-like structure (the curb) that is built on the roof. This setup is suitable for roofs with a slope of less than 14 degrees. Curb-mounted skylights are popular because they can be installed on various roof types and are easier to replace without needing to alter the flashing, making them a versatile option. However, they might be less energy-efficient due to the lack of insulation other than the curb itself and can have a more noticeable profile on the roof.
- Slope Suitability: Suitable for low slope roofs, even below a 3/12 slope, which is less than the 14 degrees mentioned.
- Energy Efficiency Rating: 3/5. The efficiency can vary depending on the insulation and materials used for the curb, but generally, they might be less energy efficient due to potential for air infiltration around the curb.
- Installation Difficulty: 3/5. Requires building a curb and ensuring proper flashing and waterproofing, which can be moderately challenging.
2. Deck Mounted Skylights
directly installed onto the roof deck and are most suitable for roofs with slopes greater than 14 degrees. They are considered more modern, offering a lower profile that many homeowners find visually appealing. These skylights are closer to the roof, which can increase energy efficiency. However, they may require more precise installation compared to curb-mounted models.
- Slope Suitability: Best for slopes greater than 3/12, aligning with the 14-degree guideline. They sit flush with the roof, making them suitable for most pitched roofs.
- Energy Efficiency Rating: 4/5. Being closer to the roof surface reduces the potential for air leakage, improving thermal performance.
- Installation Difficulty: 4/5. The installation must be very precise
since these skylights integrate directly with the roof sheathing, which can be more challenging than curb-mounted installations.
3. Self-Flashing Skylights
Integrate the flashing within the skylight unit itself, eliminating the need for separate flashing during installation. This design can reduce the risk of leaks and improve energy efficiency due to the tighter fit in the roof opening. Self-flashing skylights tend to have a lower profile compared to curb-mounted options and are easier to install. However, precise measurements are crucial for proper fit, and they may be more suitable for new installations rather than replacements.
- Slope Suitability: Similar to deck-mounted skylights, they are suitable for slopes greater than 3/12. The built-in flashing design is meant for roofs with adequate pitch to ensure proper water drainage.
- Energy Efficiency Rating: 4/5. The integrated flashing design minimizes potential leakage points, enhancing energy efficiency.
- Installation Difficulty: 2/5. The all-in-one design simplifies installation, making it easier and less time-consuming compared to the other types, especially when precise measurements are taken.
Summary
- Curb Mounted Skylights offer flexibility for various roof slopes, including very low slopes, but may have a slightly lower energy efficiency rating due to the potential for air infiltration.
- Deck Mounted Skylights provide a sleek, low-profile look for roofs with adequate pitch and have good energy efficiency due to their close fit to the roof surface, but require careful, precise installation.
- Self-Flashing Skylights simplify the installation process with an integrated flashing design, suitable for pitched roofs and offering good energy efficiency with easier installation compared to deck-mounted options.
Choosing the right skylight involves considering the roof slope, energy efficiency needs, and the complexity of the installation process. Deck and self-flashing skylights are preferred for higher slopes for their aesthetic and efficiency, while curb-mounted skylights offer versatility for a broader range of slopes, including very low slopes.
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