Is foam board insulation good for vanlife?

do y’all use foam board insulation or something else like Thinsulate. Excited to see everyone’s thoughts

We did Reflectix on the van’s walls and roof, then spray glued blue foam board insulation sections to that, and covered that with the stock ceiling and wall panels. It was pretty easy to work with. We spend most of our time in Idaho and Wyoming where it can get pretty chilly, haven’t needed an additional heater yet, although on colder nights we do layer up. The dog is fine too.

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