11. 90mm Bulk infill between rafters
12. OSB 3 or 4 Layer – continuous
13. Counter Batten / Service Void
14. Internal Ceiling Lining
Rafters or Trusses
60mm Rigid Wood Fibre
Fascia
Blocks / Pond Board
Vapour Permeable Membrane
90 x 45 Vertical timber Batten stopped short
90 x 45 Horizontal batten / Steel top hat
Roof sheet (Variable roof finish)
Gutter guard mesh for ventilation
Vented Ridge / Vented skillion
90mm Bulk infill between rafters
OSB 3 or 4 Layer - continuous (Airtight Tape on Joints)
Counter Batten / Service Void
Internal Ceiling Lining