What type of joint is used specifically for sheet copper roofs?

The standing seam joint is specifically designed for sheet copper roofs because it provides a durable and weather-tight seal. This type of joint allows for the expansion and contraction of the metal as temperatures change, which helps prevent warping and potential leaks that could occur with other joint types.

Standing seam roofs are characterized by raised seams that interlock, creating a strong mechanical bond. This design not only enhances the roof's ability to shed water effectively but also contributes to its aesthetic appeal and longevity.

The other types of joints, while used in various applications, do not provide the same level of functionality and protection as the standing seam joint in the context of sheet copper roofing. Rivet joints, for example, are commonly used in applications requiring permanent fastening but may not accommodate thermal movement as effectively. Lap joints can be used in roofing, but they don't offer the same robust sealing and water resistance as standing seams. Collapse joints are not a recognized term in roofing contexts and therefore are not applicable here.