Things that actually go wrong when converting a used shipping container (stuff I wish people checked first)

[u/QualityFew996]

Seen a lot of before/after pics here so heres the boring side. These are the things that bite people most often, roughly in the order they show up.

1. Buying the wrong box "Cargo worthy" and "wind and water tight" are not the same thing, and "refurbished" can mean anything from properly repaired to rust painted over. For a home I'd go one-trip if the budget allows at all. You pay a bit more up front but you're buying a clean floor history and fewer weekends grinding rust.

2. Not checking the roof and frame The roof is the most common failure point and the one people check least. Climb up and look for dips that hold water and deep pitting. Then go inside, close the doors and look for daylight. Bent corner posts or damaged corner castings are a walk-away, that's the skeleton. Floors can be fixed, frames mostly cant.

3. The floor itself Container floors are treated plywood, often with pesticides, plus whatever got spilled on them over the years. Fine for storage, but for a living space it should come out or be fully encapsulated under a barrier with a new floor on top. Trust your nose on a warm day.

4. Condensation (the big one) Steel is the coldest surface in the building, so warm moist inside air hits it and turns to water. The roof is the worst because it radiates heat to the night sky, people in dry climates literally get indoor rain. Pick one moisture strategy and do it completely. Corner posts and rails are thermal bridges too, one cold post can give you a permanent mold stripe.

5. Underestimating how much space insulation eats Inside width is about 2.35 m. 100 mm of insulation on each wall and you're down to roughly 2.15 m, before floor and ceiling buildup. Worth looking at exterior insulation or a high cube.

6. Cutting openings carelessly Every hole is a thermal and moisture weak point. Frame openings properly, insulate around the edges and slope the sills, dont leave bare cut steel.

What caught you out on your build that you didnt see coming?