This flashing solution is for pipes through slate and tile roofs. Grey Silicone flashings are used with pipes where heat can be up to 200 degrees C.The new Seldek„ flashing has a built - in 20 degree pitch. It is available in black epdm or grey silicon rubber for high temperature installations and is purposely designed to fit twin wall chimney diameters from 5 to 8.PropertiesSize Range: 160 to 300mm.Base size: 764mm x 764mm.Base type: Aluminium.