Decra Roofing Resource Centre, over 30 year’s experience of finding the right lightweight roofing solutions

Eaves Cold Roof Constructions

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

 

Your roof is constructed as below

Requirements Roof pitch more
than 15°
Roof pitch 15° or less, rafter centres up to 600mm Roof pitch 15° or less, rafter centres greater than 600mm & not exceeding 1200mm
Eaves ventilation system Decra 10mm Eaves

Decra 25mm 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. 30mm below line of top edge of tile battens.
Install Install Continuous Rafter Roll (in eaves vent pack). Install Continuous Rafter Roll (in eaves vent pack). Install Continuous Rafter Roll (in eaves vent pack). 
Install Install Icopal Underlay on top of rafters. Install Icopal Underlay/Breather Membrane on top of rafters. Install Icopal Underlay/Breather Membrane on top of rafters.
Install eaves batten to rear of fascia board

For rafter centres 450mm & 600mm: Eaves batten the same size as tile batten installed  behind fascia board (leave 20mm gap between batten and fascia).

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).

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: Where 50mm x 25mm tile battens are used install arris rail 200mm x 25mm (finished size), or where 50mm x 50mm tile battens are used install arris rail 200mm x 45mm (finished size). Arris rail installed behind fascia board (leave 20mm gap between arris rail and fascia).

Classic, Noxite & Plus Tile: Install eaves batten the same size as tile batten installed behind fascia board (leave 20mm gap between batten and fascia).

Decra Stratos: Install 50mm x 30mm eaves batten behind fascia board (leave 20mm gap between batten and fascia).

Install treated timber firring piece on top of rafters, each firring piece should have a finished size of  580mm x 16mm x rafter width. 16mm end of firring should butt up against the back face of fascia board.

Install 50mm x 25mm eaves batten behind fascia board (leave 20mm gap between batten and fascia).

NOTE Classic, Noxite & Plus Tile: First tile batten 50mm x 42mm, remaining tile battens  should be 50mm x 50mm.

NOTE Decra Stratos: First tile batten 65mm x 38mm, remaining tile battens should be 50mm x 50mm.

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.

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

Stratos Tile & Oberon: Install Eaves Guard 370.

 

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