u/ResistDamage

So I took over an old mobile home that was not properly maintained, and I'm trying to do repairs and fix what I can, but I'm new to home repairs and been learning as I go along.

Currently, the exterior wall trim was done with concrete panels that were not properly cut. There is no alignment, and there are large open gaps that allow humidity to seep in-between the exterior and interior walls. I want to close the gaps, but not sure what to use.

I've thought of filling the gaps with insulation rolls and then applying expandable form. I don't have power tools, and I'm on a budget. For now, I'm looking for advice on stopping the bleed.