Our Mardome Reflex Dome only Flat Roof Skylight is the perfect option for replacing rooflights on existing timber upstands. Manufactured from Marlon FSX polycarbonate, this high quality glazing unit is up to 200 times stronger than glass. The high resistance to breakage and adverse weather conditions means Mardome Reflex is very safe and reliable. The Mardome Reflex Polycarbonate Rooflight was originally designed to be used for refurbishment rooflight projects but the triple skin option can be used on new projects as the U-Value of this option is up to the standard of current building regulations making it the perfect cost effective curved dome option. As there are no pre-drilled holes, this product provides a little more flexibility with the placement of the holes needed for the fixing screws as you will need to pre-drill these prior to fitting.