ATLAS Contemporary Lantern Grey on White with Active Neutral Double Glazing - 2.5m x 1.5m The Atlas roof system is the strongest, best looking and most thermally efficient roof on the market. Glazing: Active Neutral with Planitherm low e internally Super slim 40mm rafter box profile Flat aluminium external caps to suit building design When using doubled glazed Low e glass (U-value 1.1W/m2k) the overall Atlas roof has a U-value of as low as 1.2 W/m2k. Internal - Visible internal elegance Step under an Atlas roof and prepare to be amazed. Glazed units simply seem to float in the sky. External - Subtle and stylish Discreet design for rafter external caps and the slimline ridge are a world apart from the conventional systems. Smarter Design - Looks and strength Three Atlas roof construction options provide the perfect look roof for any property style or scheme. Thermal Efficiency - Superior thermal performance Why compromise on excellent double and triple glazed performance? Enjoy superior thermal performance with an Atlas Roof. Strength - The UK's Strongest Independent BBA testing confirms the Atlas Roof has the strength to comfortably withstand the most extreme conditions.