Closed cell or open cell foam in attic ceiling space?
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Open or closed has to do with breathability of the house. Contact your local code office to see which one is recommended for your area. There may be restrictions on what you can use. Good luck.
Here's an interesting article on it: https://buildingscience.com/documents/published-articles/pa-are-you-doing-somethig-stupid/view
Closed cell is denser, better insulating. Open cell is more susceptible to mold and mildew but its expanding so it can hermetically seal an area. Seems like you wouldnt want to seal something susceptible to mold growth but maybe thats just me. Id go with closed cell
https://www.thomasnet.com/articles/plastics-rubber/closed-cell-open-cell