How (Not) to Add a Gable Extension in Sketch

I've seen people get really creative when trying to Sketch a roof in Xactimate - especially when it comes to gable or hip extensions. Most will rely on the logical inclination to go and grab another roof and place it on the main roof. Adding the extension this way not only wastes time, it will cause issues on your grouping tree and with your final measurements for labor and material.
Let me guide you through the fastest and easiest way to add a gable extension.
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