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Batten extenders are most commonly used in the valleys of tile roofs. Valleys are the areas where two roof slopes meet, creating a natural funnel for water flow. Proper management of water drainage is critical in these regions to prevent leaks and water damage. Batten extenders assist in maintaining the integrity of the tile installation by providing additional support and ensuring that tiles at the valley are aligned correctly. This is important for both aesthetics and functionality, as it helps to create a strong barrier against potential water intrusion.

In contrast, ridges typically require different types of ventilation and closure products, while eaves and overhangs are focused more on drip edges and protection from moisture runoff. Each area of a roof has specific requirements, and understanding the role of batten extenders in valleys highlights their function as essential components in enhancing roof performance and durability.