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Built tight and verify. And then ventilate.
The final step: center it in the opening, and seal the perimeter
Blowing a thick bed of insulation into an attic is really a two-person job, but you can do it by yourself if you have to
A few really cool tricks and a Master Class at the end
Tight makes right behind tubs and showers—because they can be *ruff* to retrofit
You can dig in to the roof without adding more insulation, but you can't dig far
The biggest hole in the bathroom
For the price of a drywall repair, you can look inside walls with a thermal camera at insulation and air leaks
Insulation does more than slow heat flow: it sells houses, future proofs, makes floor plans bigger, and sends your kids to college. Really.