VELUX Fixed Polycarbonate Dome With 30cm Base Unit – For Warm Roof Installation
Maximise daylight and thermal efficiency on your flat roof with the VELUX Fixed Polycarbonate Dome with 30cm Base Unit — purpose-built for warm roof constructions. Combining high-quality polycarbonate glazing with a thermally advanced 30cm PVC upstand, this fixed dome is ideal for residential, commercial, and public buildings that require maximum insulation and energy performance.
Key Features & Benefits
Specifically Designed for Warm Roof Installations: The 30cm high upstand accommodates insulation above the roof deck, ensuring airtight and thermally efficient integration.
Abundant Natural Daylight: Delivers bright, even light into interior spaces, reducing the need for artificial lighting and improving wellbeing.
Double or Triple Skin Glazing Options: Choose double skin for standard thermal performance, or triple skin for enhanced U-values and energy efficiency.
UV-Stabilised Polycarbonate Dome: Lightweight, highly impact-resistant, and resistant to yellowing or weather damage over time.
Low Maintenance: Smooth, dirt-resistant surfaces reduce the need for cleaning and upkeep.
Fixed & Secure: Non-opening design offers increased security, perfect for schools, commercial properties, and vulnerable roof areas.
Fast & Easy Installation: Pre-fabricated unit is designed to slot directly into warm roof systems, saving time on site.
Warm Roof vs Cold Roof – What’s the Difference?
Warm Roof Construction: Insulation is installed above the structural deck, keeping the entire roof structure warm. This reduces the risk of condensation and improves thermal performance — ideal for modern energy-efficient builds.
Cold Roof Construction: Insulation is installed below the roof deck, which can leave the deck exposed to colder temperatures, increasing the risk of condensation and energy loss.
The 30cm base unit in this VELUX dome is specifically engineered to meet the height requirements of warm roof build-ups, ensuring the insulation layer is fully accommodated while maintaining a weatherproof seal.
Choose from a versatile range of 10 standard sizes:
VELUX Warranty
VELUX offers a 10-year manufacturer’s warranty on this product, covering both the dome and the high-insulation base unit — delivering long-term peace of mind and performance.
 Why Choose the VELUX Fixed Dome With 30cm Base Unit?
Whether you're upgrading a commercial flat roof, fitting out a new-build extension, or improving thermal performance in a public building, this VELUX fixed dome is designed for optimal daylight, airtightness, and energy savings — specifically suited to warm roof applications.
