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

Warm Roof Constructions - Duo-pitched roofs, more than 15°

Duo pitch roof with clear air path Where breather membrane is to be installed on top of rafters (i.e in contact with insulation) and underneath 50mm x 50mm counterbattens (or 38mm where a Monarperm Breathe vapour permeable membrane is used).  


Eaves to eaves ventilation with a continuous opening equal to 25mm. Free airspace between insulation and underlay of at least 50mm (or 38mm where a Monarperm Breathe vapour permeable membrane is used). Ridge ventilation with a continuous opening equal to 5mm at each side of ridge.

Decra Solution:

i) Decra Eave Mesh providing 25mm ventilation used in conjunction with Decra warm roof eaves guard and Decra warm roof eaves closure flashing.

ii) Decra Universal Ridge/Hip Ventilator (all Decra tile profiles) or Decravent D Ridge system (Decra Classic and Noxite tile only) providing continuous ridge ventilation.
Alternatively: Tile vents at appropriate centres to provide equivalent of a 5mm continuous opening.

Quick Links

Decra Eaves Ventilation System:
Which is the right eaves ventilation system for your roofing project? 
Read more 

Ridge Ventilation Components:
Which is the right ridge ventilation system for your roofing project?
Read more

Tile Ventilation Components:
Read more about the range of tile ventilation components and their order codes

Tile Ventilator Spacing Charts:
Recommended tile ventilation spacing's to achieve 5,000mm², 10,000mm² or 25,000mm² per linear metre please click on the appropriate link below

Decra Classic and Noxite Tile

Decra Stratos and Oberon Tiles


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