If you have an easy roof to vent and decide to go that route you could use mineral wool insulation between the rafters and beneath the vent channels.
Rockwool insulation roofing.
Joe donnelly has a long history in sustainable roofing design and construction.
Rockwool stone wool insulating roof boards a comprehensive thermal sound and fire safe solution our environment is changing urban centers are growing extreme weather systems are more frequent wildfire urban interface zones are expanding and there is demand for greater performance of a buildings thermal envelope.
Rockwool products are available with a bitumen or mineral coated fiberglass face to be used in a number of roofing solutions.
Based on his knowledge of energy efficiency and sustainability of overburden assemblies he was recruited by rockwool in 2018 to advance specifications of stone wool insulation for the low slope roofing industry as a technical sales specialist.
Rockwool comfortboard 80 is a rigid mineral wool insulation sheathing board that is non combustible water repellent fire resistant and sound absorbent.
Rockwool stone wool roof insulation combines the thermal performance dimensional stability impact resistance and acoustic control required to increase the performance of many flat roof assemblies.