The objective of this work was to measure potential curing efficiency improvements by adding additional insulation to flue-cured tobacco barns. Studies were conducted at four locations in 2008. At two locations, old barns with no sidewall insulation were used. Insulation was blown through a hole cut in the plywood sidewalls and the hole was resealed. Batt insulation was also applied to the roof of these barns and covered with plywood. At a third location where barns with sidewall insulation were used, batt insulation was added to the roof and back wall and then was covered with plywood. At a fourth location, attempts were made to add additional batt insulation to sidewalls of a barn already insulated. Curing efficiency improvements were measured by increases in cured leaf/gallon of propane used. In the two non-insulated barns where insulation was blown into the sidewalls, curing efficiency was improved by 30%. The insulated barn where batt insulation was added to the roof and back wall showed a 6% improvement. There was no curing efficiency improvement at the fourth location, where additional batt insulation was added to the sidewalls of an already-insulated barn. (Reprinted with permission)