400 x 1500 mm Frameless Triple Glazed Flat Roof Skylight

The 400 x 1500 mm Frameless Skylight by Skyline Sky Lights is a sleek, non-opening rooflight solution designed for modern flat roof spaces that require extended daylight coverage. Whether it’s a hallway, kitchen, or workspace, this unit delivers premium insulation, sound reduction, and stunning natural light with a clean, frameless finish.

Engineered with advanced triple-glazed glass technology, this skylight features toughened and laminated layers, Low-E coatings, and gas-filled cavities to achieve a U-value of 0.9 W/m²K — ideal for energy-conscious homes and buildings.

🔍 Technical Specifications:

• Glazing Type: Triple Glazed

• Internal Glass Size: 400 x 1500 mm

• External Glass Size: 600 x 1700 mm

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

• Middle Pane: 6 mm iplus Low-E Thermally Toughened (BS EN 12150)

• Bottom Pane: Stratobel Clearlite 44.2 (Laminated Safety Glass – EN 14449)

• Spacer: 15 mm Black Warm Edge

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

• U-Value: 0.9 W/m²K

• G-Value: 58%

• Noise Reduction: 39 dB

• Net Weight: 34 kg

• Self-Cleaning Glass: Yes

• UV Protection: Yes

• Tint: Clear

🛡️ Safety & Compliance

All Skyline Sky Lights products are CE certified and comply fully with UK Building Regulations and British Safety Standards. Designed for installation at up to a 45° pitch, this unit ensures maximum performance, longevity, and peace of mind.

🛠️ Installation Guidance

• Top glass includes a black ceramic border, extending the external dimensions by 200 mm on each side.

• Leave 10 mm allowance from upstand to upstand internally for a snug fit.

• Construct upstand using 2×1 or 2×2 inch timber for support.

• Use foam rope over the internal supporting baton to distribute glass weight evenly.

• Seal perimeter using Dowsil 791 black silicone (do not use acrylic sealants).

🧮 Need a Custom Size?

Use our online Frameless Skylight Calculator for made-to-order sizes to match your exact roof opening.

🏆 Why Choose Skyline Sky Lights?

• Elegant frameless design with durable triple glazing

• Excellent insulation and acoustic performance

• Self-cleaning, UV-protected, and weather-resistant

• Backed by a 20-year manufacturer’s warranty

• Free delivery within London (M25) + fast UK-wide shipping