Hi roel there are two types of insulated roofs vented and unvented each with different possibilities for insulation.
Rockwool insulation roofing.
It has excellent acoustic properties.
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.
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.
Joe donnelly has a long history in sustainable roofing design and construction.
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.
Toprock dd is a high density uncoated stone wool insulation board for low slope roof applications toprock dd is a suitable substrate board for all low slope roof decks and is compatible as the substrate for mechanically attached membrane systems.