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I have never actually heard that before. Thinking it through though I could see a small potential for nail pops or sagging from loose nails. Nails, not screws, would have been used in the ‘60s. If that would happen you could easily add some drywall screws and patch/paint. Either way you’re much better off than the <R19 you currently have.
R49 (the code in VA for example) blown in is 18in. That will absolutely hold up fine with your ceiling.
Mentor
I’m no expert in this area, but I did have a leaky old mountain cabin. I used a thermal camera to figure out both doors and plugins would improve the cold air leaks. I got that idea from working at a housing government agency. We had a department that went to low income housing and tried to improve energy efficiency. The thermal camera was their main tool. It did improve my cabin temps at night dramatically.
Are you sure you even have drywall on the ceiling? If the house was built in the 60s there is a decent chance you have plaster and it would likely be significantly stronger than drywall.
That’s a good point. It’s a rental so I’m not there to look but my recollection is that it’s drywall. I have some pictures from the inspection report and it’s drywall around the AC vents but ac was added much after the house was built. There’s also an addition that certainly is drywall. It’s possible that there are portions that are plaster.
I’m in TX, and we have 24” blown in. That’s the norm here, and we have drywall. Never thought of it being to heavy; that sounds like total nonsense. It’s held up in our home since 2017 when we had it done; no issues.
Not in Denver, but central VA. I went off of R values and it saves tons on heat costs. Unfortunately, I couldn't do the walls.