Which statement about conventional sloped glazing systems is NOT correct?

The statement that is not correct concerns the inclination of conventional sloped glazing systems. These systems are designed to function optimally when installed at a sufficiently steep angle, typically recommended to be no less than 20° from the horizontal. This angle aids in effective water drainage, preventing water accumulation that could lead to leaks or structural issues.

In contrast, the other statements accurately reflect the requirements and characteristics of conventional sloped glazing systems. They are indeed permitted to be installed at angles greater than 30°, ensuring alignment with design and aesthetic preferences while maintaining functionality. Proper drainage is critical for these systems to mitigate water infiltration risks, reinforcing the need for drainage provisions in their design. Additionally, specific types of sealants are required to secure the glass and maintain weather-tightness, providing durability and resistance to environmental elements. The incorrectness of the first statement underlines the importance of adhering to the recommended installation angles to avoid potential problems associated with inadequate drainage.