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The runoff from the roofline is not being diverted into the downspout/eaves system and has penetrated underneath the building envelope. This compromised the sheathing wood and a full demo is a result (below):


A roof termination is any area where the roof intersects or stops at a vertical wall. These areas can be very problematic with regards to water intrusion from roof runoff.


Roof terminations into chimneys for example often lead to leaks when the roof diverter flashing is improperly installed. Diverter flashing must be extended away from a stucco chimney so that the runoff water can be 'diverted' into the eavestrough. In some cases a kickout flashing is required to accomplish this, depending on the direction of the slope of the roof.


Often times the eavestrough  has been installed before the stucco in many older homes. This provides very little protection if the diverter flashing is incorrect. Constant water exposure will deteriorate the often only single layer of tar paper over time, eventually leading to leaks.


It is important to consult a stucco professional if you notice a lot of staining around your stucco chimney. This is a tell tale sign of a improper roof termination.


Restoration and recovery

Once the corner is rebuilt and the building envelope is tied in, the cement applications are done. The end result (below):