Here is a local favorite restaurant of home town fame..”Skyline Chili”. This project was installed in the winter months and was an existing tar and gravel roof (BUR). We installed a 1/2″ insulation board over the gravel (an application approved of by Duro-Last) and then installed the Duro-Last system over the insulation board. Result is a leak proof, energy efficient, low maintance roof system.
We were thus able to save the existing roof insulation with this overlay and save our customers thousands of dollars avoiding an expensive tear-off.