No poly required below grade for your zone, or any zone: http://publicecodes.cyberregs.com/icod/irc/2009/icod_irc_2009_6_sec001_par003.htm
Code requirements; 10/13 footnote "c"; http://publicecodes.cyberregs.com/icod/irc/2009/icod_irc_2009_11_sec002.htm
The science of it all: http://www.buildingscience.com/documents/digests/bsd-103-understanding-basements?full_view=1
Pick one; http://www.buildingscience.com/docu...merica-high-r-foundations-case-study-analysis
Gary
Code requirements; 10/13 footnote "c"; http://publicecodes.cyberregs.com/icod/irc/2009/icod_irc_2009_11_sec002.htm
The science of it all: http://www.buildingscience.com/documents/digests/bsd-103-understanding-basements?full_view=1
Pick one; http://www.buildingscience.com/docu...merica-high-r-foundations-case-study-analysis
Gary