I’ve got a project in my crawlspace where the framing on an interior stairway sticks down into the crawlspace area. It is always very cold down there, so I went to inspect and saw some seriously subpar insulation with badly installed fiberglass batts, missing batts, etc. As well, a couple of outlet boxes have rather large gaps where the cold air is certainly going straight into the home.
My initial plan was to pull the batts then use a home spray foam kit to lay down a couple inches of foam. Then perhaps later trim and fit batts back into the remaining space.
But I was thinking about it today and wonder if I can’t just spray right over the batts and wood framing. It’s the crawlspace so it doesn’t need to be flush to the framing studs. It would form an air seal on the entire thing, and would likely make those existing batts a lot more efficient. It would also fill the voids.
So, I’m thinking I’m pretty clever at the thought of spraying on top of the existing batts, saving time, and having a better outcome.
Any reason not to do this?
Thanks for input!
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