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Valley Installation

See Metal Tile Valley.

The valley boards installed between the valley jack rafters to support the valley and tile battens are required to be set with their outer edge at a minimum of 90 mm from the centre line of the valley. Valley boards are required to support a point load of 1.1.kN, which is taken to be the weight of a tradesperson with a bag of tools.
Valleys are installed so water discharges over the back 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 valley surface.
Joints cannot have an overlap of less than 200 mm.
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 and boards supporting flashings must be H.3 treated, and all metal and timber should be separated by underlay .
Clause: 
015_003_004_000_000_000_000_000_000
Clause Number: 
15.3.4
/cop/other-products/pressed-metal-tiles#valley-installation
Draft Clause: 
014_003_004_000_000_000_000_000_000