Coxdome Fixed Classic Range Double Skin Roof Dome With Upstand

If you're looking for a reliable way to brighten up your flat roof space, the Coxdome Classic Fixed Roof Dome is a smart and stylish solution. Designed to allow plenty of natural daylight in while maintaining thermal performance, this roof dome is perfect for spaces like kitchens, hallways, stairwells, or any flat roof area where fixed ventilation isn’t needed. This model includes a double-skin polycarbonate dome for excellent insulation and durability, paired with a 150mm high PVC-u upstand that’s thermally broken to reduce heat loss and prevent condensation. It's built to work with most flat roofing systems, including single ply, GRP, hot melt, asphalt, liquid, and lead. Available in a variety of sizes—from 600mm to 3,000mm—and in clear or diffused glazing options, it’s easy to find the right fit for your project. Plus, it features a universal design that makes installation straightforward for both professionals and confident DIYers.

Why Choose the Coxdome Classic Fixed Dome Rooflight?

Lets in natural light while maintaining insulation Double-skin polycarbonate glazing for thermal efficiency and impact resistance PVC-u upstand included – thermally broken to reduce condensation Clear or diffused dome options – choose your level of privacy and light diffusion High-security fixings as standard Modular design – easy to install and configure Durable and weather-resistant – built to last and perform in all conditions

Technical Performance

U-Value: 2.7 W/m²K (double skin) Sound Reduction: 20dB Glazing: 3mm impact-resistant polycarbonate Fire Classification: B-s1-d0 (BS EN15301:1 2007) Non-Fragile: Class B, ACR(M)001 soft body tested

FAQs

Can this roof dome be installed on any flat roof?

Yes! It’s compatible with most flat roofing systems, including single ply, GRP, hot melt, asphalt, liquid membranes, and lead roofs. Just ensure a suitable builder’s upstand or use the included PVC-u upstand.

Is the dome completely sealed and weatherproof?

Absolutely. The thermally broken upstand and precision-engineered dome provide excellent waterproofing and condensation control, even in harsh weather conditions.

What’s the difference between clear and diffused glazing?

Clear glazing allows maximum light and visibility—great for spaces where you want bright, direct daylight. Diffused glazing softens the light and offers more privacy, ideal for bathrooms or overlooked areas.

Check out our full range of roofing supplies.

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