All battens should be stamped with BS5534, the supplier, origin, grade and size of timber.

Non-rot eave guard fix to rafters in the correct position to fascia board. This is mitigating the requirement of having underlay in the gutter which could rot over time. Or; a 5U felt could be used.

Underlay taken down to the eave guard, overlapping by a minimum of 150mm but not protruding into the gutter.

First batten gauged to allow for the tile to overhang the gutter by 50mm.

Underlay should be provided in one continuous length down the valley.

Horizontal underlay to then overlap at the valley by a minimum of 150mm.

Battens should be gauge appropriately for the roof covering.

For single lap tiles a minimum of 75mm overlap.

Maximum number of battens joints in a row is 3 in 12 for a tile gauge of less than 200mm

1 in 4 for tile gauge more than 200mm.

Tile battens must be treated at the verge, including dry fix systems.

This can be achieved by placing the already treated end of the batten at the verge and placing the cut end of the batten within the roof.

Ensure that all overlaps in the underlay are fixed down using a gauged batten, an additional batten or an approved adhesive.

Underlay should have a sag between the rafters to allow any moisture a clear run to the gutter and not be blocked by the batten.

Underlay at the ridge to have a clear gap of 5mm. throughout its full length to provide high level ventilation.

Additional batten provided at the ridge to provide a fixing point for the dry ridge system.

Batten installed as per the manufacturer’s instruction, this will require the use of a strap.

Once the roof underlay and battening are complete and marked out for tiling, it is ready to be loaded out.