Effective for any building permit issued on or after July 1, 2014, the 2012 IECC with Massachusetts amendments will be exclusively enforced. Among the new regulations is a blower door test for new single and two family homes. View the 2012 IECC from the ICC site and Massachusetts’s amendments for details.
Effective for any building permit issued on or after July 1, 2014, the underside of floors constructed with non-dimensional lumber (e.g. TJI’s) must be protected with ½” sheet rock or 5/8” wood structural panel. There are some exceptions. See code for details.