We just bought a 1840's log home here in Richmond Ontario. The question that I have is in regards to the crawl space, I think that using that do-it-yourself spray foam is the way to go but has anyone here used it before? How was it?

As well has anyone had this same typo of situation with their crawl space? should I insulate the underside of the floor or insulate the outside walls?

Thanks in advance
Chris