Attic Plumbing Home › Forums › Archives › Old Bulletin Board Archives › Attic Plumbing This topic has 0 replies, 1 voice, and was last updated 25 years, 8 months ago by pdoneil. Viewing 0 reply threads Author Posts 2 Mar 1999 at 5:19 pm #282774 pdoneil Would like to know the manditory type and thickness of insulation for attic plumbing in NC. Author Posts Viewing 0 reply threads The forum ‘Old Bulletin Board Archives’ is closed to new topics and replies.