no, it is our basement ceiling tile. our basement is about 3/4 finished, and has a dropped ceiling and there is just one spot that gets wet below the back bathroom whenever it rains really hard. can't figure this one out because the upstairs is fine. and we have checked the tiles numerous times after flushing the toilet, taking a shower, running water, and no moisture. the reason i know it happens when it rains hard, is a couple of times this year when the tornado sirens have gone off and i have gone to the basement, it has really rained hard and i can hear it dripping thru the ceiling tiles. our walls are poured concrete in the basement. the silicone worked very well for us so far. i don't think we have the french drain, it is just a square drain made out of the black pipe that we had a small trench dug about a foot deep in the side yard to carry the collected water away. it worked miraculously ! speaking of drains, my boss had 2 drains at the bottom of his basement to carry water away that are at the bottom of the basement (french drains perhaps

) anywho, they collapsed and his basement was flooding so he had to replace those a few weeks ago, his yard was dug up and destroyed - big bucks !