VELUX CVU & ISU Electric Curved Glass Flat Roof Window

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).

 

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

 

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.