400 x 400 mm Frameless Triple Glazed Flat Roof Skylight

Enhance your living or working space with the Skyline Sky Lights 400 x 400 mm Frameless Flat Roof Skylight, a compact yet high-performance solution for modern builds. Featuring advanced triple glazing and a minimalistic frameless design, this skylight delivers exceptional thermal insulation, acoustic comfort, and timeless style.

Built with self-cleaning toughened safety glass, this unit achieves an outstanding U-value of 0.9 W/m²K and a G-value of 58%, offering excellent energy efficiency while maximizing natural daylight. It is ideal for small rooms, bathrooms, extensions, or corridors where natural light is essential.

🔍 Technical Specifications:

• Glazing Type: Triple Glazed

• Internal Glass Size: 400 x 400 mm

• External Glass Size: 600 x 600 mm

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

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

• Bottom Glass: Stratobel Clearlite 44.2 iplus 1.1 (Laminated + Low-E coating – EN 14449)

• Spacer: 15 mm Black Warm Edge (both gaps)

• Air Gaps: 15 mm Argon Filled (90%)

• U-Value: 0.9 W/m²K

• G-Value: 58%

• Noise Reduction: 39 dB

• Weight: 10.2 kg

• UV Protection: Yes

• Self-Cleaning Glass: Yes

• Tint: Clear

🛡️ Safety & Compliance:

Skyline Sky Lights products meet all British Standards and are CE marked, ensuring compliance with UK Building Regulations. These skylights are designed to be installed at pitches up to 45 degrees, with all appropriate safety markings in place.

🛠️ Installation Guidelines:

• Allow 10 mm extra internally from upstand to upstand for proper fitting.

• External dimensions extend by 200 mm in each direction due to the ceramic black border.

• Upstand Material: 2×1 or 2×2 inch timber is recommended.

• Use foam rope on internal support batten to level pressure distribution.

• Seal using Dowsil 791 (Black) – avoid acrylic sealants.

🧮 Need a Custom Size?

Explore our easy-to-use Custom Skylight Size Calculators to order a perfect fit for your project.

🏆 Why Choose Skyline Sky Lights?

• Triple-glazed technology for superior insulation

• Frameless, self-cleaning design

• UV-protected and noise-reducing

• Built to last — backed by a 20-year warranty