I received a quote for spray foam in my crawl space (BASF Spraytite 158 Closed-Cell 3" R-19.80)Regarding health concerns of spray foam, get the MSDS sheet for the specific product(s) that you or the contractor would be using.
From my understanding offgasing diminishes rapidly as the product cures. After the foam is fully cured and the building is aired out there is little health risk.
Further reducing risk, there would likely be a layer of drywall between the foam and living spaces.
I would not equate spray foam at all to vaping where the individual inhales gases directly into the lungs.
Yes yes and who knows. It sometimes takes decades to fully understand what a building product does to it's surroundings. Our houses and bodies are filled with plastics and chemicals. Draw your line where you feel comfortable, there are many ways to skin a cat.From what I've read spray foam insulation is substantially more efficient but more costly but I'm mostly have issues with the health concerns.