Twelve years ago we had a gas log fireplace added to our home. The contractor did an inadequate job on the flashing, so earlier this year I had to replace the flashing, shingles and rotten wood on the chimney. Everything was fine until today, when I noticed what looks like a small amount of water (maybe a quarter of a cup) dripping through the front of the fireplace while it was being used. I'm thinking this may have been condensation; however, it's the first time in twelve years that we've experenced this. What are your thoughts?