What is the purpose of an expansion joint in low slope roofing systems?

The purpose of an expansion joint in low slope roofing systems is primarily to minimize the effects of stresses and movements that occur due to temperature changes, structural settling, and other factors. As roofs expand and contract with varying weather conditions, these movements can lead to stress and potential damage if not properly accommodated. Expansion joints are designed to allow for this movement, helping to prevent cracking, splitting, or other forms of damage that could compromise the integrity of the roofing system.

By incorporating expansion joints, roofers ensure that the roofing materials can move freely without causing stress points that could lead to leaks or structural failures. This ultimately enhances the durability and longevity of the roofing system, making it a crucial component in low slope roofing applications. In contrast, the other options address different issues, such as weight support, insulation enhancement, or drainage improvement, none of which relate specifically to the function of expansion joints.