Mardome Trade Double Skin Rooflights Mardome Trade is the standard specification dome unit in the Mardome dome rooflights range. Providing stylish, contemporary looks as standard and excellent insulation, triple skin Mardome Trade rooflights achieve a centre pane U-value of 1.8 W/m²K with options to reduce Ud-value to as low as 0.95W/m²K. Designed with features to ensure quick and easy installation Mardome Trade is the first choice roof dome for flat roofs with a range of added extras to choose from including kerb options to suit every new build or refurbishment project, and, for convenience a selection of popular sizes for next day delivery. Sleek, contemporary aesthetics inside and out with aerodynamic low rise glazing unit Optimum thermal performance as standard with U-value of 1.8W/m²K and options to reduce this to 0.9W/m²K Constant separation of glazing skins across full width of dome including fixing flange avoids cold spots and minimises the risk of condensation Extensive options to satisfy acoustics, ventilation and light transmission Multiwall PVC kerb in standard and tall options All cabling and actuators hidden within kerb on mains powered opening units Steep kerb walls allows larger glazing unit meaning more natural daylight Tapered kerb foot facilitates easy application of roof covering and eliminates the need for timber fillets Custom Options Sizes: 450x450mm 600x600mm 750x750mm 900x600mm 900x750mm 900x900mm 1050x1050mm 1200x600mm 1200x750mm 1200x900mm 1200x1200mm Shape: Dome -  Next Day Delivery Available Pyramid - 2 Working Delivery Day Kerb: Dome Only Fixed/Unvented Dome Only Vented/Opening 150mm 300mm Opening: Fixed Manual Electrical Powered Solar Powered Access Hatch Ventilation: Unvented Hit & Miss Auto Hit & Miss