Solution for wooden slab with beams and joists supporting wooden planking on the soffit. The insulation package is interposed between wooden battens to form a support for ventilation, through the use of suitable slotted metal elements and multilayer sheet as a watertight element.
Self-drilling screw + gasket
Multilayer protection Coverib sheet
Omega-shaped slotted element
Insulating material + 5 b. wooden strip