I’m an insulation contractor in western Massachusetts. I specialize in loose-fill, damp-spray, and dense-pack cellulose. I also own a spray-foam truck that I bought a couple of years ago; I was hoping it would increase my efficiency if I no longer had to sub out the limited areas of spray foam that some cellulose projects called for. While I’ve sprayed quite a bit of foam, I’m now in the process of selling the foam rig. So many variables can affect the quality of the finished product — everything from how the equipment is calibrated to outdoor temperatures — that it’s...

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