The design of the product when fitted on top of the tile or slate battens will cause this effect. It acts in the same way as a swept verge and encourages the water to run away from the roof joint.

Whether using slates, plain tiles or interlocking tiles, the first course at eaves should be the full tile or larger slate cut.

If this is not desirable at low pitches, then Dry Fix Bonding Gutter® may be installed with the side flange ribs at the same height or lower than the top surface of the roof battens, providing that it is adequately supported.