I used the same sound deadening “insulation” on the roof as I used on the floor. I believe it was Siless brand, similar to the kilmat that RRR used. I only had two sheets left, and used it more to take away the tin can sound of the roof and really didn’t expect any thermal improvement, but as you can see in the picture, it does make a difference in that area as well. The heater melted the snow off of the roof where it wasn’t insulated.
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I may end up adding something like this to the roof yet before installing a headliner.
https://www.amazon.com/gp/aw/d/B07B...d2lkZ2V0TmFtZT1zcF9waG9uZV9kZXRhaWwp13NParams
