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

Warm Roof Constructions

The table below sets out appropriate detailing at eaves where:

  • Insulation (rigid board type) following line of rafter with insulation level with top of rafter or on top of rafter.
    50mm x 50mm counterbattens installed on top of underlay.
  • A trapezoidal composite insulated warm roof system is to be installed under the roof tiles

For warm roof constructions with insulation inset into rafters with a 50mm air gap between top of insulation and top of rafter, click here 

 

Your roof is constructed as below

Requirements Insulation (rigid board type) following line of rafter with insulation level with top of rafter or on top of rafter.
50mm x 50mm counterbattens installed on
top of underlay.
Trapezoidal composite insulated warm roof system, installed under the roof tiles
Eaves ventilation system Provide Decra Eaves Mesh with free airflow of 25,000mm² per linear metre.

Provide mesh with free airflow of 25,000mm² per linear metre.

Setting out point for fascia board Level with top edge of rafter or top edge of insulation board. (If installation boards are installed).
Install

Install Icopal Monarperm Breathe vapour permeable membrane on top of rafters and under counterbattens.

N/A
Install eaves batten to rear of fascia board

 

Install eaves batten the same size as tile batten installed behind fascia board.
Install Decra Eaves Guard

Decra Warm Roof Eaves Guard installed under an Icopal Monarperm Breathe vapour permeable membrane.

Use of Decra Eaves Mesh & Decra Eaves Closure Flashing recommended.

N/A, Use of mesh & Decra Eaves Closure Flashing recommended.

 

 

 

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