What has caused this damage?
a. Missing or improperly installed kickout flashing combined with no exterior wall membrane.
b. Runoff has found its way into the soffit, draining against the chimney and entering the space behind the siding, causing decay.
c. Gaps created by structural movement of the chimney.
d. Accumulation of condensation from the gas-burning fireplace combined with an un-insulated exterior wall. Moisture impermeable vinyl siding hindered drying to the outside.