Flashings
Appropriate flashings must be used to provide a watertight seal where roof sheeting ends.
![Diagram showing lead apron flashing wedged and grouted into a brick wall and over flashing in galvanised steel or aluminium notched to deck profile.](images/page_005_end_apron_flashing_and_steel.gif)
End apron flashing and steel decking
![Diagram showing galvanised steel/aluminium ridge capping over a roof deck.](images/page_005_ridge_capping_and_steel_decking.gif)
Ridge capping and_steel decking
![Diagram showing galvanised steel/aluminium capping notched to sheet profile, over roof sheeting with a stop ended trough. Sheeting overlays a purlin and abuts a timber fascia board.](images/page_005_end_capping_galvanised_steel.gif)
End capping, galvanised steel or aluminium sheet
![Diagram showing soft zinc over flashing stepped and tapered to follow fall of the roof. Roof sheets are fastened at 600 mm centres.](images/page_005_stepped_apron_flashing.gif)
Stepped apron flashing
![Diagram showing tray sealed and fastened to roof sheeting, apron flashing turned down between ribs and end of sheeting turned up.](images/page_005_flashing_to_skylights.gif)
Flashing to skylights
![Diagram showing sealing around a flue that penetrates a roof.](images/page_005_sealing_for_roof_penetration.gif)
Sealing of roof penetration