Master Flash Flashing Silicone Type’s flexible design means it can be fitted on all types of roofing surfaces from tiled to metal. The aluminium base is designed to form a seal on any panel configuration and roof pitch, regardless of the pipe location. The heavy duty aluminium is also corrosion resistant. The Master Flash roof flashing is designed to withstand snow, ice and hail, vibration and pipe movement caused by expansion and contraction. It is available in a range of sizes, from 6mm to 660mm and can be easily adapted to fit to the required diameter. The manufacturer recommends choosing a Master Flash with an opening at least 20% smaller than the pipe diameter. If necessary trim the opening to 20% smaller than the pipe diameter. Then slide the roof flashing over your flue pipe, using a non-petroleum base lubricant to ease installation if necessary. We recommend purchasing the Master Flash SK1 Fixing Kit with this product, which contains silicone and screws to seal and secure the Master Flash base to the roof. Master Flash roof flashing is also available with a EPDM cone rather than a silicone cone. The silicone cone has been tested to a wider range of temperatures than the EPDM. Please note that the flexible silicone cone will be red – for black please see the EPDM type.