Technical analysis
Maintaining drainage and vapour-control continuity at critical metal-roof terminations.
Engineering scope
- Principle
- Identify where incidental water enters the secondary layer and provide a visible route to discharge.
- Verification
- Avoid reverse laps, pockets and unprotected openings at gutters, ridges, parapets, eaves and equipment bases.
- Field control
- Exterior breathable and interior air-vapour layers must each remain independently continuous.
System decision
Start with the actual roof or wall build-up, climate, indoor condition and risk at the relevant interface. Product data must be connected to a defined layer and detail.
Documentation and acceptance
Keep design details, approved product data, delivery labels, batch records, mock-ups, concealed-work photographs and repairs traceable to the installed area.