Step Flashing has a splice every six inches. J Flashing has a splice every nine feet. Step Flashin and J Flashing both need a kick out. I have seen the Step Flashing LEAK more often than the J Flashing. I suppose that J Flashing is only supposed to work on the Expensive Tile Roofs. That is what I want on my roof, a minimum wage roofer installing Step Flashing with 18 times as many splices.