Flashing and Drainage Flashing is a crucial component in modern
masonry walls. Whereas solid, multi-wythe masonry walls mostly
constructed before the 1900s manage water infiltration through
absorption and evaporation, modern masonry walls must
accommodate moisture penetration by providing a collection and
drainage system. This system consists of flashing and weeps.
Flashing also serves to prevent water penetration at interfaces
with other building systems, such as windows and other
penetrations. Cavity wall design recognizes that water
penetration through masonry is inevitable, and it provides the
necessary means to manage moisture. Flashing location, material
selection, detailing and proper installation are all
significantly important to ensure that water does not penetrate
to the interior areas of buildings. |Flashing seams or laps that
are not properly sealed can lead to water leakage. Locating
flashing is a fairly straightforward task, provided water flow
and the limitations of the building wall component