The eaves is where the roof drains into the gutter and is the point where there is the most water. Careful attention to detail is important when installing or repairing eaves. If there is a gap below the tiles at the eaves of 16mm or more then eaves fillers are required for profiled tiles to prevent access to birds and rodents. The eaves also play a major part in ventilating the roof. Always use an eaves ventilation system.