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Please note: Flat Roof Dome only. Upstands can be purchased using the Drop-down menuC4 860mm Diameter Polycarbonate Circular Roof Skylight - Available with the option of Curb Upstand, and Double or Triple skin layer. Hinged frame and spindle for Opening Ventilation can be purchased seperatly. For help or information please call us on.Our Flat Roof Domes are made from Polycarbonate (Double and triple skin Polycarbonate/Acrylic) Polycarbonate Flat Roof Domes are Virtually unbreakable, Fire rating available, Certified Non-Fragile.Specifications:This can fit existing or Site Formed Curbs of 800mm in diameter (External Dimensions)Polycarbonate rooflights comply with the Health and Safety in Roofwork standards.Patented security bolt fixings.Perimeter screw & seal fixing ensures that the Em-Dome rooflight is completely waterproof.All polycarbonate Em-Domes have a minimum 3 mm thick glazing.The Inner skin thickness does varie according to the size of the dome.Once installed in accordance with the manufacturers' recommendations, Em-Domes can be expected to exceed the life of the roof covering, Firestone EPDM rubber cover has been proved to last over 50 years.Em-Domes have a guarantee against the effects of defective design, construction and material for ten years, subject to certain conditions.Single, double or triple glazed?Single glazed are Suitable for unheated areas. Specify with caution.Double glazed are Economical and have U-Value 2.9W/m2KTriple glazed offer the best insulation and Complies with virtually all Building Regulations, Better sound insulation.Delivery2 - 3 Working days.Please NoteIf next working day delivery is available on a product. all orders must be placed by 12am noon so we can process and despatch goods for next working day. Some parts of Scotland may take longer.Any technical instructions or details are provided as guidance only. We strongly reccomend that no work should be carried out or installation companys booked prior to delivery and inspection of your Roofing Products.To ensure your installation meets the legally required standards; planning and installation should be carried out by a suitably qualified installer.