Most installers in my region use double J. This is how I’ve done it for close to 20 years. Others use aluminum, I like this cause it burns up my scrap J’s. There are MANY other ways to do this including the one piece inside corners, but I’ve never seen one of those because our siding suppliers don’t stock them. I hope you find this video useful. Thanks for watching. . . . . . . . #vinylsiding #exteriorfinishes #protips #constructiontips #protip #vinyljchannel #yeg #edmonton