What to consider
Fit insulation around rafters and junctions without leaving unintended gaps. The vapour-control layer and airtight connections require a roof-specific design. Avoid enclosing damp or damaged timber and retain the ventilation required by the build-up.
Apply this to your roof
Record your preferences in the roof plan. Final dimensions, product suitability and the complete build-up are assessed for the actual roof; keep the agreed details and manufacturer instructions with your project documents.