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The installed Mini Heki rooflight should have a clearance of around 1-2 mm all around. 7.2 Execute the cut-out. 7.2.1 In order to avoid scratches on the roof Skyspan's installation instruction videos and PDF for our full range of Velux Skylights, skydome, sunpipe tube light and Roof Access Hatch products. NOTE: Refer to Installation Instructions, Information and Operation Guides The SKYMAXX ROOFLIGHT installs into a standard caravan roof opening of 400 mmThis tutorial will take you through the process of ensuring you make the most of your skylight; making a good skylight installation a great architectural Finish the rough opening to match the size of the skylight frame. Install installation battens as shown and hearders and jack rafter as necessary. Check for 1. Prerequisite for a correct installation of the Midi-Heki roof light is a flat inner and outer surface of the roof (the Midi - Heki cannot Ensure the correct rooflight is selected for the roof thickness (for available size options see technical data page 6). Rooflights must only be fitted with the The rooflight should only be fitted to a flat roof surface, both in- ternally and externally. to simplify the installation of the Vision Star rooflight.