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

Warm Roof Partial Fill Constructions

The table below sets out appropriate detailing at eaves for warm roof constructions with insulation following line of rafter with insulation inset into rafters with a 50mm airgap between top of insulation and top of rafter.

 

Your roof is constructed as below

Requirements Roof pitch 15° or less, rafter centres up to 600mm. Roof pitch 15° or less, rafter centres greater than 600mm & not exceeding 1200mm. Roof pitch more
than 15°, rafter centres up to 600mm.
Roof pitch more
than 15,° rafter centres greater
than 600mm & not exceeding
1200mm.
Eaves ventilation system Decra 25mm Eaves

Decra 25mm Eaves Ventilation System.

Decra 25mm Eaves Ventilation System. Decra 25mm Eaves Ventilation System.
Setting out point for fascia board 25mm below line of top edge of tile battens. 30mm below line of top edge of tile battens. 25mm below line of top edge of tile battens. 25mm 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 Continuous Rafter Roll (in eaves vent pack).
Install Install Icopal Underlay/Breather Membrane on top of rafters. Install Icopal Underlay/Breather Membrane on top of rafters. Install Icopal Monarperm Breathe vapour permeable membrane on top of rafters. Install Icopal Monarperm Breathe vapour permeable membrane on top of rafters.
Install eaves batten to rear of fascia board

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.

All tile profile except Oberon: Install 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 25mm (finished size), installed behind fascia board (leave 20mm gap between arris rail and fascia).

All tile profile 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 profile 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.
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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