Rant: Insulated my container home wrong and now I'm sweating in January

I tried using spray foam on the inside walls of my 40-foot container last summer. Figured it'd be the best way to seal up the metal and keep the heat out. But I didn't put enough ventilation in, and now the container traps moisture like crazy. I'm in Phoenix, Arizona, and even in winter it feels like a sauna inside with condensation running down the walls. I learned that you absolutely need a vapor barrier and some kind of air gap between the foam and the metal skin. Anyone else run into moisture problems with their container build and find a fix that actually works?

2 comments

2 Comments

emma_ramirez8d ago

dude i used to see all these container builds online and thought spray foam was the holy grail too. my buddy in tucson lost 2k worth of drywall from moisture behind his foam insulation and now i'm totally rethinking my whole plan for my shed.

adamcoleman8d ago

Read somewhere that closed cell foam without a ventilation gap is basically a moisture sandwich. Condensation just builds up between the metal and foam over time.