We've almost 6 inches of rain in our area over the past few days. I heard a small popping sound from the insert during one of the heavier downpours last night. I opened the door, shined the flashlight in, and noticed water streaks down the back wall of the insert. My insert is in a masonry fireplace. I ran a stainless liner up the chimney and installed a rain cap and top plate at the top of the chimney. Have any of you guys had water still come down your stove pipe? I guess the rain must've blown in through the sides of the rain cap? I wonder if I should be concerned about rust?