We have a wood-burning fireplace insert with vinyl siding covering the chimney above the roof. During a recent rainstorm, we heard water dripping (loudly) onto the metal box inside the fireplace box (but not into the actual fireplace). A few minutes later, water started running in streams over the top of the fireplace, between the sheetrock and the actual fireplace. We had the installer come and take a look, but today it happened again, the first rain after it was repaired. I don't think it's the roof flashing b/c it's not running down the wall (no sheetrock damage), but I can't get a straight answer. Any ideas?