We’ve noticed water damage in our sunroom, which is bordered on one side by our concrete patio. After a quick investigation we believe that water has entered the gap between the patio and the foundation. If we’re right then that hopefully accounts for the water damage.
The gap in question was previously filled with either fiberboard or concrete crack sealant, but enough of it has deteriorated to conceivably allow moisture in.
To remedy this issue I installed backer rod in the gap that I then covered with concrete crack sealant. This will hopefully be the fix that keeps that wall of the sunroom nice and dry.