VELUX Fixed ISU Curved Glass Flat Roof Window with CFU Base
Stylish, Maintenance-Free Roof Window for Flat Roofs (0–15° Pitch)
The VELUX Fixed Curved Glass Rooflight (ISU Top + CFU Base) is a sleek and durable fixed roof window, ideal for adding natural light to flat roof spaces. Its modern, curved glass design not only looks stunning but is also practical — allowing rainwater to run off naturally, even at pitches as low as 0°.
Key Features:
For Flat Roofs (0–15° Pitch): Perfect for extensions, bathrooms, hallways, and more
Two-Part Design: Includes CFU fixed base unit + ISU curved glass top
Curved Glass Top: Frameless design for rainwater runoff and a modern finish
Double or Triple Glazing: Choose the performance you need
Low Maintenance: Self-cleaning curved glass with UV protection
Multiple Sizes Available: Fits small rooms to large open-plan areas
10-Year Warranty: Long-lasting VELUX quality assurance
Product Benefits:
Uninterrupted Natural Light: Frameless curved glass edge brings in more daylight
No Standing Water: Curved design helps water drain away, even on flat roofs
Energy Efficient: Choose double or triple glazing for excellent insulation
Safe & Secure: Laminated inner pane for added safety
Architectural Appeal: A stylish upgrade from traditional domes or flat rooflights
Technical Performance
|
Feature
|
Double Glazing (ISD)
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Triple Glazing (IST)
|
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Thermal Insulation (Uw)
|
1.2 W/m²K
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0.95 W/m²K
|
|
Noise Reduction
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36 dB
|
42 dB
|
|
Glass Composition
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Outer toughened, inner laminated
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Outer toughened, inner laminated
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Solar Heat Gain (g-value)
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0.52
|
0.37
|
|
Light Transmission
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~69%
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~63%
|
|
Reaction to Fire (EN 13501-)
|
Broof (t1)
|
Broof (t1)
|
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What’s Included:
CFU Fixed Base Unit
ISU Curved Glass Top Unit
Installation instructions
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 Available Sizes:
A wide range of standard sizes is available. Select your size from the drop-down menu above to suit your space.
Perfect For:
Flat roof home extensions
Kitchens, bathrooms, and stairwells
Contemporary residential and commercial designs
Projects needing a modern, low-maintenance rooflight
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Bring light and style to your flat roof project with the VELUX Fixed ISU Curved Glass Rooflight – order now with fast delivery and full warranty support.
