Valley Installation

Valleys are installed so water discharges over the fascia and into the eaves gutter. The valleys are held in position by clips specially designed to allow for expansion, or by compatible nails and washers placed alongside the valley or bent over the top lip of the valley.

Under no circumstances must the fasteners penetrate the sole of the valley. The top end of the valley should be turned up against the hip or ridge battens to the height of the batten. Where two valleys meet over a dormer, they are cut, shaped, joined, and sealed so that they form a continuous valley.

The tile edge should be bent down to a minimum of 5 mm from the valley floor.

The gap between tiles on opposing sides of the valley must be a minimum of 70 mm.

Valley boards must be H3.1 treated and separated from metal by underlay.