Page 1 Rubber4Roofs http://www.rubber4roofs.co.uk/how-to-waterproof-a-flat-roof-skylightPage 2 Page 3 Page 4 For a step by step guide on How to Waterproof a Flat Roof Skylight, please visit Rubber4Roofs http://www.rubber4roofs.co.uk/how-to-waterproof-a-flat-roof-skylight