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.
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.
Great video! I need to do a basement ceiling and rim joist bays and the budget is tight. If you know where I can order the other brands of mineral wool, I would love to know too.
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.
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.
Great video! I need to do a basement ceiling and rim joist bays and the budget is tight. If you know where I can order the other brands of mineral wool, I would love to know too.
that was a good video, and the followup one too
those guys have good video presense. I will keep them in mind next time I need a video like this. Thanks!