New Orleans sits 6 feet below sea level in a subtropical climate zone with average relative humidity above 75 percent year-round. Summer dew points regularly hit 75 degrees. When outdoor air at 90 degrees and 80 percent humidity meets an air-conditioned attic space at 110 degrees, condensation forms instantly on any surface below the dew point. Older homes built before the 1980s often lack vapor barriers entirely. Many still have original wood shiplap sheathing with no underlayment. These construction methods worked before central air conditioning became standard, but they fail catastrophically in modern climate-controlled homes. The temperature differential between conditioned space and attic creates constant moisture migration.
Louisiana amended its residential building code in 2005 to require improved attic ventilation, but most New Orleans housing stock predates these standards. Homes in Gentilly, Lakeview, and Mid-City were built in the 1950s and 1960s with minimal ridge venting. Post-Katrina rebuilds often focused on speed over building science, leaving many homes with inadequate moisture management. Heritage Roofing New Orleans works with local building inspectors and understands Orleans Parish permit requirements. We know which solutions pass inspection and which create code violations. Our crews also navigate historic district reviews when your home falls under Vieux Carré Commission or local landmark oversight. Proper moisture control requires both technical expertise and local regulatory knowledge.
