Keeping warm in an aluminum cap...

[Youngunner]

Check out my thread. I sold my fiberglass shell and picked up a contractor aluminum shell. To say the least, I did a few modifications including insulation...



http://www.expeditionportal.com/forum/threads/59025-Transforming-a-commerical-shell-into-an-expedtion-camper

 

[Youngunner]

It was also lined with a trunk carpet material.

 

[tanglefoot]

I cut pieces of foam board and glued them in between the ribs on my former aluminum shell. I think I used some caulk or silicone to seal the gaps around them. It was pretty comfy to sleep under. I never saw any condensation.

 

[ronburgandy]

I glued and taped in Styrofoam board super warm, no condensation, and quiet. For the curved edges I used 4 layers of aluminum foil insulation works great, easy, light, and cheep to install.

 

[keezer37]

If you use adhesive on foam board, make sure it lists "for foamboard". I'm not 100% sure but I believe some that are petroleum based are not suitable.
Heavy Duty Liquid Nails is suitable.