My 1 yr old house has a grading prob which can't b e fixed. and it is causing water buildup at the basement windows which are leaking. I have put in the plastic bubble covers on the outside and then sprayed "great stuff" on the inside where the window meets the sill. This stopped a great deal of the water which originally poured in. Now only 2 of 5 windows are dribbling water in. (some is actually coming in underneath the metal sill. What can you suggest to stop the rest of the leak that is there? (Don't care about ever opening the windows!) Thanks!!!!