I like the sprayfoam method over the foam sheets because there is little to no waste. I buy a 600sf fast rise kit from Tigerfoam for each room and after all the prep. I just keep spraying until the tanks are empty. I think it works out to equal or even cheaper than all those little cans to seal around the sheets.
Renting the cellulose machine from the nearest box store usually costs $20 or less and I can return it the same day. I know SF will disagree but I've had good luck with getting a nice dense fill on my walls.
I could save more money by doing two rooms at a time as my rooms are small and I end up with about 4 inches for sprayfoam on the walls. But I am happy with the results.
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