TECHNILAINE implementation is the same as rock wool implementation.
An air gap between the insulation product and the under-roof.
An air gap between the insulation material and a rainscreen (non perspiring material).
you don’t need to let an air gap between the insulation material and the rains screen for TECHNICHANVRE (but an air gap of 4 cm between the insulation product and the under-roof is crucial)
indoor airtight vapour retarder implementation (but always permeable to water vapour: not a vapour barrier but a vapour retarder). It is important to take you time and to be minutious during this stage to guarantee a durable insulation