Stop-ends are required at the upper end of all roofing sheets, on horizontal metal wall cladding and at the lower edge of penetrations
Stop-ends for trapezoidal profiles are of two types, i.e. 'dog-eared' or 'pull-up'.
Stop-ending tools should be in good condition so that they do not mark the coating. This is particularly important when using pre-painted material.
Stop ending can cause distortion of the pan adjacent to the turn-up, which can cause contact and mark the turndown of the cover flashing onto the pan of the cladding. This can be avoided by technique and experiment, often standing in the pan adjacent to the end being stopped will prevent the pan from becoming convex at this point.
A 'dog-eared' or full stopend is made by cutting the rib back to the height of the profile so the material can be dressed and “wrapped around” 90°. It is not possible to dog-ear stop-end many profiles because of the shape of their rib.
To create dog-eared stop-ends:
Slit all ribs to a length equivalent to their height.
Cut away the tops of the ribs at a slight upwards angle and remove.
Insert turn-up tool to full depth and turn up more than right angles.
Knock dog's ears flat on a stop-end tool as shown.
Ensure tray is lying flat
The rib height should be added to the sheet length when the material is ordered to provide an allowance for a full stop-end.
Stop-ends for corrugate should be pulled up to the full height of the profile, and on low pitches at exposed sites, additional weathering may be provided by the use of filler blocks. See 8.8 Profile Closures.