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Scottish Practice - Eaves Cold Roof Constructions

The table below sets out appropriate detailing at eaves for traditional Scottish cold roof sarked constructions with insulation installed at horizontal ceiling level

 

Your roof is constructed as below

Requirements

Scottish Practice

Rafter Centres not exceeding 600mm centres.
Roof sarking boarded with counter battens (25mm max thickness) on top.

Where Decra Classic, Noxite & Plus Tile are to be installed on roof pitches 17.5° and above in pitch.

Where Decra Stratos & Oberon Tiles are to be installed on roof pitches 25° and above in pitch.

Where roof pitches fall below the above parameters refer to previous column. For roof pitches this low underlay must be installed on top of counter battens to ensure sufficient fall into gutter.

Scottish Practice

Rafter centres not exceeding 600mm centres.

Roof sarking boarded with counter battens (25mm max thickness) on top.

Where Decra Classic, Noxite & Plus Tile are to be installed on roof pitches below 17.5° in pitch.

Where Decra Stratos & Oberon Tiles are to be installed on roof pitches below 25° in pitch.

Note: For roof pitches this low underlay must be installed on top of counter battens to ensure sufficient fall into gutter.

Eaves ventilation system Decra 10mm Eaves Ventilation System.

Decra 25mm Eaves Ventilation System.

Setting out point for fascia board 15mm below line of top edge of tile battens. 25mm below line of top edge of tile battens.
Install

Install continuous rafter roll and locate in a position to separate the roofing underlay from the insulation below.

In some re-roofing projects the Continuous Rafter Roll cannot be laid without partial removal of the sarking for access.

If partial removal of the sarking is not possible or desirable some other method of ensuring clear ventilation between insulation and sarking should be employed.

Install continuous rafter roll and locate in a position to separate the roofing underlay from the insulation below.

In some re-roofing projects the Continuous Rafter Roll cannot be laid without partial removal of the sarking for access.

If partial removal of the sarking is not possible or desirable some other method of ensuring clear ventilation between insulation and sarking should be employed.
Install Install appropriate Icopal Underlay/Breather membrane on top of rafters and under counterbattens. Install Icopal Monarperm Breathe vapour permeable membrane on top of rafters.
Install eaves batten to rear of fascia board

Classic, Noxite & Plus Tile: Install 50mm x 50mm eaves batten on top of sarking, leave 20mm gap between batten and fascia and the sarking boards should be cut back to allow airflow into the loft space.

Decra Stratos: Install 50mm x 63mm deep eaves batten on top of sarking leave 20mm gap between batten and fascia and the sarking boards should be cut back to allow airflow into the loft space.

Oberon only: Install arris rail 200mm x 50mm (finished size) on top of sarking, leave 20mm gap between arris rail and fascia and the sarking boards should be cut back to allow airflow into the loft space.

All tile profiles except Oberon: For rafter centres 900mm & 1200mm, 15° - 17.5° pitches: 50mm x 38mm eaves batten installed behind fascia board (leave 20mm gap between batten and fascia).

All tile profiles except Oberon: For rafter centres 900mm & 1200mm, 17.5° + pitches: eaves batten the same size as tile batten installed behind fascia board (leave 20mm gap between batten and fascia).

Oberon only: Install arris rail 200mm x 45mm (finished size), installed behind fascia board (leave 20mm gap between arris rail and fascia).

Install Decra Eaves Guard Classic, Noxite & Plus Tile: Install Eaves Guard 400.

Stratos Tile & Oberon: Install Eaves Guard 370.

Classic, Noxite & Plus Tile: Install Eaves Guard 400.

Stratos Tile & Oberon: Install Eaves Guard 370. 

 

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