Try to be as brief as possible so bear with me. I just purchased a new Pacific Energy Summitt insert. Waiting to have it installed. In the mean time we had -13 degree temp and two days later 55 degrees with 12 hours heavy rain. Crazy! Got up xmas eve and my fireplace was full of water. Running into basement also. Not just a small amount but alot. Backtrack to June. Same issue. Had flashing replaced, new shingles and all rechalked. Flashing was in terrible shape. Since them NO water issues. Lots of rain no problem. Also had fireplace sealed with spray on sealant. OK. Called builder my wifes uncle whom I trust. He said with huge temp change he thinks condensation inside fireplace is the problem. He said it can cause alot of water to drip inside fireplace. Fireplace is only eight years old and he said everything looked in tip top shape. Help with opinions please! I hate to put a new insert in and them have it ruined. Might add after it quit raining water was still dripping 7 hours later. Thanks