All without having a stockpile of extra foam or needing to buy any specialized equipment. We appreciate this project for the ingenuity of taking something relatively simple (an acid-base reaction ...

but unless you buy one of those DIY spray foam insulation kits, the largest by far is the cost of labor. Depending on your market, labor for a typical job runs 27-39% of typical project expenses ...

This teardrop camper is built from insulation or XPS foam and some canvas to help keep it all together; it has a bathroom inside and is fully off-grid capable ...