The way it works is fairly simple – just select the face that you’d like to create your roof from, select a roof type, and then click “Make Roof.” This will generate your roof inside your model. It definitely separates itself from other roof extensions with the sheer number of roof options available to you. Like most of Vali Architects extensions, this is a fantastic extension for creating roofs in your SketchUp models. Instant Roof NUI for SketchUp Function Description