Deck Mounted vs Curb Mounted Skylights: Which is the Best Option for Your Home?

Choosing the right skylight is not just about bringing in natural light.
It directly affects energy efficiency, installation cost, and long-term performance.

Two main types dominate the market: deck mounted skylights and curb mounted skylights.
Each serves a specific purpose depending on your roof type and project needs.

This guide explains the differences clearly, with verified and practical information.

What Are Deck Mounted Skylights?

Deck mounted skylights are installed directly onto the roof deck, sitting flush with the roofing material.
They are commonly used on pitched roofs.

These skylights are designed with integrated flashing systems, often supplied by brands like VELUX, which helps create a tight seal against water and air.

Key Benefits

• Better energy efficiency due to tighter sealing
• Low-profile appearance that blends into the roofline
• Reduced exposure to wind uplift
• Clean, modern finish

What Are Curb Mounted Skylights?

Curb mounted skylights are installed on a raised frame (curb) built above the roof surface.
They are widely used on flat or low-slope roofs.

Manufacturers like FAKRO often design curb-mounted systems for flexibility and ease of installation.

Key Benefits

• Ideal for flat and low-pitch roofs
• Easier to replace (the curb remains in place)
• Greater flexibility in sizing and retrofitting
• Better water drainage on flat surfaces

Key Differences Between Deck Mounted and Curb Mounted Skylights

The main differences come down to installation method, roof compatibility, and performance.

Installation Style

• Deck mounted: Installed flush with the roof deck
• Curb mounted: Installed on a raised frame

Roof Compatibility

• Deck mounted: Best for pitched roofs
• Curb mounted: Best for flat or low-slope roofs

Appearance

• Deck mounted: Sleek and modern
• Curb mounted: Bulkier and more noticeable

Maintenance and Replacement

• Deck mounted: More complex to replace
• Curb mounted: Easier to swap out

Installation Considerations

Proper installation is critical for both types.

Deck Mounted Skylights

• Require accurate roof cutting
• Depend on flashing systems for waterproofing
• Typically installed during new builds or major roof work

Curb Mounted Skylights

• Require building or using a pre-made curb
• Easier to install on existing flat roofs
• Common in commercial and retrofit projects

Hiring experienced installers reduces the risk of leaks and improves performance.

Which Skylight Is Best for Your Home?

Choose deck mounted skylights if:

• You have a pitched roof
• You want a sleek, low-profile design
• Energy efficiency is a priority

Choose curb mounted skylights if:

• You have a flat or low-slope roof
• You need easier installation or replacement
• You are upgrading or retrofitting an existing roof