baffleTypical weathering detail ~vertical dpcsealantstepped flashingWhere the horizontal lapped joint between upper and lower
cladding panels coincides with the vertical open drained joint, a
stepped apron flashing is required to weather the intersection.
Lead is the natural choice for this, but reinforced synthetic rubber
or reinforced plastic sheet may be preferred to avoid possible lead
oxide staining over the panel surface.
Baffle material is traditionally of non-ferrous metal such as
copper, but like lead this can cause staining to the surface.
Neoprene, butyl rubber or PVC are alternatives.
Concrete Claddings--Drained Joint Intersection