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Has anyone used a product like this yourself, and if so, what was your experience? (sh.itjust.works)
submitted 2 weeks ago by to c/asklemmy@lemmy.world
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It’s $545 for 36 cans on Amazon.

I need to insulate and air seal my basement ceiling and rim joist bays.

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[–] 17 points 2 weeks ago* (3 children)

Don't believe the coverage claims, it's always much lower.

https://youtu.be/2DuwMoezQLA

Also, Rockwool is a brand name of the generic mineral wool. There are other, cheaper brands of mineral wool, than rock wool and they work just as well.

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  • [–] 2 points 2 weeks ago*

    That's really interesting to me that they use "board feet" for the coverage. For lumber, board foot is a very specific measurement that means a square foot, one inch thick (so 144 cubic inches). The insulation value is then measured at 2" thick. Unless DIY spray foam means something different by a board foot then coverage is going to half the area at the advertised R value, and roughly a third if you fill in the 2x4 framing cavity.

    Professional spray foam is pretty expensive, but it's probably a way better idea than than this DIY stuff. The mineral wool is probably fine, and I would happily let somebody punch me in the stomach if it meant I didn't have to mess with fiberglass batts.

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