VELUX Electric ISU Curved Glass Flat Roof Window with CVU Base
Smart, High-Performance Flat Roof Window for 0–15° Roof Pitches
The VELUX Electric ISU Curved Glass Flat Roof Window with CVU Base is a premium daylighting and ventilation solution designed specifically for flat roofs with pitches between 0–15°. Offering a sleek, curved glass finish and fully electric operation, it’s ideal for modern extensions, renovations, and compliant new builds.
Curved Glass Top – Engineered for Water Drainage on Flat Roofs
The ISU Curved Glass Top Unit features a frameless, curved edge design that promotes natural water run-off, even on roofs with zero pitch. The glass surface is also treated with a dirt-repellent coating, reducing maintenance over time.
Perfect for use with felt, GRP, or Liquid roofing materials, it provides a clean, contemporary external appearance without compromising performance.
Double or Triple Glazing Options
Double Glazed – Delivers excellent U-values and daylight performance for general applications.
Triple Glazed – Offers enhanced energy efficiency and acoustic insulation, suited for bedrooms or urban environments.
All versions include a laminated inner pane for safety and compliance with Building Regulations (including Part Q where required).
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Two-Part Modular System for Simplified Install
CVU Electric Base Unit – Pre-wired motor with integrated actuator
ISU Curved Glass Top Unit – Installs securely to the base for a watertight, airtight seal
The modular design allows for faster on-site handling and installation, saving time and labour.
Rain Sensor Included as Standard
Every electric CVU base unit comes with a built-in rain sensor. This feature automatically closes the window when rain is detected – protecting interiors from water ingress when no one is home.
Trade Benefits of Rain Sensor Integration:
Eliminates the need for external wiring or add-ons
Reassures clients of weather protection and system reliability
Adds value in kitchen, bathroom, and living space installations
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Smart Home Compatibility & App Control
The electric base is fully compatible with VELUX Intelligent Home Control systems:
Operate via the VELUX App (iOS & Android)
Integrates with VELUX ACTIVE indoor climate control
Enables scheduled ventilation and smart automation
Ideal for smart home upgrades or client remote access needs.
Available in a Wide Range of Sizes
Offered in multiple dimensions to fit bathrooms, kitchens, stairwells, and open-plan spaces. All options are compliant with VELUX standards for thermal performance, airtightness, and acoustic control.
10-Year Manufacturer’s Warranty
The complete system is backed by a 10-year VELUX warranty, giving you and your clients long-term peace of mind.
Key Features
Suitable for flat roofs (0–15° pitch)
Curved glass top with natural drainage
Double or triple glazing options
Two-part design for simplified installation
Pre-installed rain sensor for automatic closure
Fully compatible with VELUX App and smart control
Wide size range to suit any project
10-year warranty on the full system
Choose the VELUX ISU Curved Glass Flat Roof Window with CVU Base for your next flat roof installation – a smart, efficient solution that blends performance, convenience, and clean architectural design.
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