Diy Barn Door Slider . To start, let's take a look at the components of the door we will be making. The sliding barn door hardware and rail are made of 1/4 inch thick 2 inch wide flat bar, cold rolled steel. DIY Sliding Farmhouse Door Farmhouse doors, Farmhouse diy, Bifold from www.pinterest.com 18 different sizes to choose from. Making a diy sliding barn door is pretty easy. There are a few ways to make an exterior sliding barn door.