Let's explore some of the extension’s impressive features. Instant Roof, by Chuck Vali of Vali Architects, is a SketchUp extension used to quickly create gables, hips, sheds, and trellises anywhere a user needs them. This extension is easy to install, learn, and use. Instant Roof, a SketchUp extension by Chuck Vali of Vali Architects, allows users to create gables, hips, sheds, and trellises effortlessly.