Which of the following methods involves tearing off and replacing an existing roofing system?

The method of re-roofing involves tearing off and replacing an existing roofing system. This process typically includes removing the old roofing materials, which may be worn out or damaged, and then installing a new roofing system in its place. Re-roofing is often necessary when a roof has lived out its lifespan or experienced significant weather-related deterioration, making it less effective at protecting the building underneath.

In contrast, re-covering refers to laying a new layer of roofing material over an existing roof without complete removal. This method can be a more cost-effective solution but doesn't address underlying issues with the existing roof. The other terms, such as ridge course and ridge rafters, are specific components of roof design and structural framing, which do not relate to the overall process of replacing an entire roofing system.