Please note this is a fixed flat roof window base only (kerb or upstand). Fixed flat roof window base Fixed (not opening) flat roof window CFP is ideal where there is a need for bringing in large amounts of daylight without adding extra ventilation. Polycarbonate top cover Please note a polycarbonate top cover is required for use with this product to create a complete flat roof window system and is available in both clear and opaque. VELUX flat roof windows It's amazing what adding a VELUX flat roof window can do for your home. Many living spaces in flat roof buildings - including kitchens, living rooms, and offices - get very little natural light. With a VELUX flat roof window, you can transform and improve virtually any space with daylight. Imagine what a VELUX flat roof window can do for your home: add natural light, increase fresh air and provide a fresh look to your interior. Available in open or fixed versions. Both can be used for new installations or as replacements for existing dome products. Great thermal and energy efficiency VELUX high-performance insulation is integrated into the frame to give the best possible protection against heat loss. This, combined with our optimised protection against thermal bridges, delivers a warmer, more comfortable home. Ease of installation This product can be installed quickly and easily.