400 x 3000 mm Frameless Triple Glazed Flat Roof Skylight

Transform your living space with the Skyline Sky Lights 400 x 3000 mm Frameless Flat Roof Skylight, purpose-built for long narrow areas like corridors, kitchens, and extensions. With a streamlined design and superior performance, this unit delivers uninterrupted daylight, energy savings, and peace of mind.

Made with triple-glazed safety glass, including low-emissivity coatings and argon-filled cavities, this non-opening skylight is engineered to provide a U-Value of 0.9 W/m²K and sound insulation up to 39 dB — ideal for modern residential and commercial properties.

🔍 Technical Specifications:

• Glazing Type: Triple Glazed

• Internal Glass Size: 400 x 3000 mm

• External Glass Size: 600 x 3200 mm

• Top Pane: 6 mm Planibel Clearlite – Thermally Toughened (BS EN 12150)

• Middle Pane: 4 mm Planibel Clearlite – Thermally Toughened (BS EN 12150)

• Bottom Pane: Stratobel Clearlite 44.2 iplus 1.1 – Laminated with Low-E (EN 14449)

• Spacer Type: 15 mm Black Warm Edge

• Air Gap: 15 mm Argon Filled (90%) – both layers

• U-Value: 0.9 W/m²K

• G-Value: 58%

• Noise Reduction: 39 dB

• Net Weight: 66 kg

• Self-Cleaning Glass: Yes

• UV Protection: Yes

• Tint: Clear

🛡️ Safety & Compliance

This skylight complies with all UK Building Regulations and is fully CE certified, ensuring it meets stringent British Safety Standards. Designed for flat roofs with a maximum installation pitch of 45 degrees.

🛠️ Installation Guidance:

• External glass extends 200 mm in all directions due to black ceramic border.

• Allow an extra 10 mm internally (upstand to upstand) for accurate fit.

• Upstands should be built from 2×1 or 2×2 inch timber.

• Install foam rope along the internal batten to evenly distribute weight.

• Use Dowsil 791 black sealant for a watertight finish. (Avoid acrylic sealants.)

🧮 Need a Custom Fit?

Use our Custom Frameless Skylight Calculators to get a tailor-made skylight sized precisely for your opening.

🏆 Why Choose Skyline Sky Lights?

• Triple-glazed glass for superior insulation

• Frameless, sleek finish with self-cleaning surface

• Clear, UV-protected glass for safe, natural light

• Long format ideal for narrow, modern spaces

• Free UK-wide delivery + backed by a 20-year warranty