Old 1920s built on post and beam, then put on foundation at some point. Floor system is 4X8 every 16' and 4X8 every 32". Ship-lap as sub floor. Question, if all is infested, do you have to remove all, or can a pest guy come in and treat. I would prefer putting new joist a couple of inches away from existing and leaving the old stuff in. Web sites say they "bugs" might be gone or dead. I am not willing or quallified to make that call. I don't think a "home inspector" is either. Pest guy is the guy to make the determination but untill that happens, if it happens, any of you experiance any thing simmilar? House 900 sq ft or so will go on market for about $130k I would never buy it!