If you meant or a single-file RBZ plugin , go with Roof by TIG . It's lightweight, free, and does exactly one thing: create standard roofs.
Would you like step-by-step installation instructions or help choosing based on your roof type (hipped, gabled, dutch, etc.)? sketchup roof plugin
It sounds like you're looking for a focused on roof creation — possibly as a single "piece" of software or a specific tool recommendation. If you meant or a single-file RBZ plugin