You should choose the type of flashing which corresponds with the type of roofing material on your roof, i.e. flashing type SFX for flat roofing material up to˙16 mm (typically slates), flashing type TFX for roofing material˙between˙16 – 50˙mm (typically tiles) and flashing type UFX for roofing˙materials between 16 – 120 mm˙(monastery tiles).