Plastic pipes under concrete floor a good idea? Home › Forums › Public Forums › General Plumbing › Plastic pipes under concrete floor a good idea? This topic has 2 replies, 3 voices, and was last updated 19 years, 10 months ago by Retired plbg1. Viewing 2 reply threads Author Posts 29 Jun 2004 at 3:08 pm #277279 MasterPlumbersKeymaster Hello All, A friend of mine is building his own place and has asked me to get any advice on using plastic pipes under the concrete floors. Is it a good or bad idea? Should he use copper instead? Any suggestions or recommendations would be greatly appreciated. Thanks,George. 29 Jun 2004 at 6:55 pm #295901 PLUMBILLParticipant It’s a real good idea that he contacts a licensed plumber to help him, concrete is unforgiving if he gets it wrong which most pople do. 30 Jun 2004 at 9:54 am #295902 Retired plbg1Participant It would be better to run pipe overhead and keep it out of floor, because later on you have problems. Author Posts Viewing 2 reply threads You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In