It is the wind pressure that causes the majority of wall leaks not water flowing down the wall.
Parapet wall roof leaks.
Don t seal the parapet rain the primary source of water is driven by wind through permeable masonry units mortar joints and cracks in the wall.
Water from either of these locations may bypass flashing and enter the backup wall directly.
If the cavity drains freely water should move down to the lower levels of flashing and drain from the wall.
Roof leaks in the roofing seams on the parapet walls can be repaired the same way as the flat roof area in just a few minutes with the scrs.
Seam separation is a common issue with traditional roofing materials.
The parapet walls around the roof also have these seams.
There are other common causes for leakage at parapet walls.
Water may be entering the coping at the top of the parapet or entering the roof side of the parapet.