What should be the positioning of fasteners in valley tiles?

The positioning of fasteners in valley tiles is crucial to ensure the structural integrity and waterproofing of a roofing system. Fasteners should be positioned at least 8 inches away from the center of the valley. This practice helps to prevent water from pooling or running directly over the fasteners, which can lead to leaks and other potential issues over time. By adhering to this guideline, roofers can significantly improve the durability and performance of the roofing installation, ensuring that the valley area is adequately sealed against the elements.

The other distances provided in the choices do not align with the best practices for valley tile installation. Placing fasteners too close to the edge or center could compromise the effectiveness of the valley and lead to water-related problems, so maintaining the specified distance from the center is critical in achieving a reliable roofing system.