Insulation Question - Ceiling Only?

[RogerD]

I used this sort of thing in the curved bits of my trailer  https://www.amazon.com/AMERIQUE-AMSLV3MM2R-200SQFT-Premium-Underlayment/dp/B07Q6JY7TH
Basically reflective mylar backed on Yoga mat... ish
then  used that 1/2" puzzle mat over the top.. where I could..for more insulation

That doesn't appear to be insulation. No mention of R-value for any of what you are using.

 

[RogerD]

[size=small]3M 90 works. You have to spray both surfaces and wait for them to get tacky and then press on.[/size]