Flashing Edges

The dressed soft edging or the downturn of a notched flashing acts as a baffle to wind and rain at the outside edge of a transverse flashing, as does the stop-end of the cladding at the upper end. The void in between these two barriers acts as a pressure equalisation gap.  Longitudinal flashings should also have a small gap between the downturn and  the adjacent rib to allow for pressure equalisation and avoid capillary action.

Soft edging can be supplied in material compatible with the roofing material.  This may be a naturally malleable metal, or metal perforated to enable it to be shaped to the profile, see MRM Soft Edge Standard.

Stop ends must be provided for all pitches in all wind zones

In extreme circumstances, a profiled or notched closure can be used between the stop end and the downturn or soft edge.  When closures or filler blocks are used, they must be adhered to the profile or secured by the cladding fasteners to ensure they remain in position.

Additional ventilation requirements must be considered when using profiled closures, see Ventilation Pathways.

Flashing Hook

Anti-capillary hems must be flattened parallel but not completely crushed.
Revision Category: 
2 - Editing and rearrangement
Revision Detail: 

Copy moved from Flashing Cover to this clause.

Draft Clause: