What’s New A clarification to Section N1102.2.4 (Access Hatches and Doors) of the 2015 International Residential Code (IRC) states that vertical doors that access unconditioned attics and crawl spaces do not require an R-value to match the required wall insulation. Such doors must comply with the fenestration U-factor requirements of Table N1102.1.2. Recent Projects Structural engineering consultation regarding failure and movement concerns…