I've got a crack that runs down the center of my basement and every spring it allows a little seepage. the power went out and my sump pump couldn't work causing my finished basement to flood. I pulled up the carpet and in doing so it appeared to pull some adhesive stuff up with it and in some of those areas it's a little damp. The plan is to cut trenches around the walls and down the center of the floor and put indoor drain tile in and run all of this to the sump pump. What type of stone do I want to put around the drian tile pipe that will be covered with cement and will this stop the preasure from pushing water through my floor.

 

Jamiep,
I don't know the answer to your question, I don't get involved in that sort of thing w/ my business, but I did want to alert you of something I saw in this month's Popular Science (May 2001). Check out page 37. There is an article about a new electronic device that draws moisture away from the walls. Maybe it is something you can look into after your problem is solved as an extra "aid" in keeping the humidity down. Just an idea.

 

jamiep,
Your plan is a considerable expense, and if the power goes out again, the pump again fails, and you've got more water. Been There, done that!
Have you checked with a water proofing contractor to see if there is anything that can be done to the crack itself.