Insulation on the roof was a huge success! While not measured to get actual data, the car is much cooler and the A/C doesn't have to run as hard to keep the interior at a desired temp. Overall, in my eyes the project was a success and would certainly say it's worth the time and effort.
Our test run was a trip to the Grand Canyon's North Rim!
Our test run was a trip to the Grand Canyon's North Rim!