foamed? Lots of kits on Amazon for DIY. It appears there are two types, cans and the two-part systems. I'd go two-part, but you have to make sure the walls and foam mix are at the correct temperature for spraying. It's a mess and you have to move fast, like can't stop spraying for more than 30s fast or you have to change nozzles. One brand I've seen recommended (I've never spray foamed myself but have thought about doing it) is Tiger Foam. I think with help it looks doable.