How do you build a french drain? Home › Forums › Archives › Old Bulletin Board Archives › How do you build a french drain? This topic has 0 replies, 1 voice, and was last updated 21 years, 7 months ago by Mark Santiago. Viewing 0 reply threads Author Posts 26 Jun 1999 at 2:50 am #282081 Mark Santiago Also, can you attach a tight line drain to a french drain? Weve been having water in our ducts. We just installed a sump pump but I know that wont eliminate the problem.Thanks! Author Posts Viewing 0 reply threads The forum ‘Old Bulletin Board Archives’ is closed to new topics and replies.