I insulated my black van ceiling with 2 inches of foam board which gets warm under the sun; still have a small section which is bare and way too hot to touch. Foam board does a great job.anybody have a good way to install insulation and ceiling cover? our van just bakes under the sun and i am hoping by insulating it and covering it, it will cool it down. Thanks
Not sure how you are doing your calculations but here is how I get R10. My 'corrugations have strips of EZ-Cool (about 3/16" with 1/8" air gap above) for about R2 or average of R1. I then have 1" of polyiso between the ribs for R6. The ribs are filled with Great Stuff. Then comes the 1/2" layer of Firestone Cover board at R2.5 (polyiso with hard skin). It certainly can be argued that at the ribs the R value is less. But R10 is a pretty good number.At best maybe 3.8?